Best Buffer Amplifier for Multiplexers Circuit Diagram

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This is a Best Buffer Amplifier for Multiplexers Circuit Diagram. A buffer amplifier (sometimes simply called a buffer) is one that provides electrical impedance transformation from one circuit to another. The precision input characteristics of the HA-5147 help simplify system error budgets, while its speed and drive capabilities provide fast charging of the multiplexer`s output capacitance. 

Read: Stabilized Capacitance Buffer Circuit Diagram

 Best Buffer Amplifier for Multiplexers Circuit Diagram


Best Buffer Amplifier for Multiplexers Circuit Diagram


This speed eliminates an increased multiplexer acquisition time, which can be induced by more limited amplifiers. The HA-5147 accurately transfers information to the next stage while effectively reducing any loading effects on the multiplexer`s output.
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Simple Cmos Connect Switch Circuit Diagram

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This is a Simple Complementary metal–oxide–semiconductor connect switch circuit diagram, CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits. This connect switch does not rely on mains hum for switching-It-can be used with battery powered circuits.

 Simple Cmos Connect Switch Circuit Diagram

Simple Cmos Connect Switch Circuit Diagram


Schmitt trigger IC1 forms a 100 kHz oscillator and IC2a which is biased into the linear region, amplifies the output and charges CI via the diode. IC2b acts as a level detector. When the sensor is touched, the oscillator signal is severely attenuated which causes CI to discharge and IC2b to change state.


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Electronic Light Switch Circuit Diagram

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This is a simple Electronic Light Switch Circuit Diagram.. The circuit is a light switch who triggers when light drops on photo resistor. It is fairly simple in construction and can be used in a million applications. The photo resistor and the trimmer work as a voltage divider and also polarize the transistor TR1. TR1 triggers TR2 and TR2 drives the relay. Trimmer R7 is for adjusting the sensitivity of the circuit. 

 Switching Improves Regulator Efficiency Circuit Diagram

  Electronic Light Switch Circuit Diagram





Parts: 
R = photoresistor
R1= 4.7 Kohm
R2= 1.2 Kohm
R3= 2.2 Kohm
R4= 1.2 Kohm
R5= 1.2 Kohm
R6= 2.7 Kohm
R7= 100Kohm
Trimmer
C1 = 10uf/16V
electrolytic
TR1= BC107 - BC108 NPN
TR2= BC107 - BC108 NPN
TR3= BC557 - BC558 PNP - BC327
D1 = 1N4148 Relay = any 12Volt relay
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Artificial random Simulated Flicker Sequencer Circuit Diagram

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Artificial random Simulated Flicker Sequencer Circuit Diagram, The artificial random sequencer drives a solid-state relay. If you power a low-wattage lamp from the relay, the lamp will appear to flicker like a candle`s flame in the wind; using higher-wattage lamps allows you to simulate the blaze of a fireplace or campfire. 

 Artificial random Simulated Flicker Sequencer Circuit Diagram


 Artificial random Simulated Flicker Sequencer Circuit Diagram


You can enhance the effect by using three or more such circuits to power an array of lamps. The circuit comprises an oscillator, IC1, and a 15-stage, artificial random sequencer, IC2-4. The sequencer produces a serial bit stream that repeats only every 32 767 bits. 

Feedback from the sequencer`s stages 14 and 15 go through IC4D and back to the serial input of IC2. Notice the RC network that feeds IC4C; the network feeds a positive pulse into the sequencer to ensure that it won`t get stuck with all zeros at power-up. The leftover XOR gates IC4A and IC4B further scramble the pattern. The serial stream from IC4B drives a solid-state relay that features zero-voltage switching and can handle loads as high as 1 A at 12 to 280 Vac.
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Simple Polarity Gain Adapting Circuit Diagram

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This is a Simple Polarity Gain Adapting Circuit Diagram. In this circuit by adapting one potentiometer, this circuit`s output can be varied from a positive-going version of the input signal, smoothly through zero output, then to a negative-going version of the input (see the figure). 

 Simple Polarity Gain Adapting Circuit Diagram


Stabilized Capacitance Buffer Circuit Diagram


If the input signal is a positive pulse of, for example, +2-V peak/the output pulse amplitude can be smoothly varied from +2-V through ground (no output) to a -2-V peak. Taking a closer look at the setup, assume that the signal has a +2-V peak input. The A section of the quad op amp is an input buffer, op amp 0 provides a fixed negative-going output of -4-V peak, and op amp supplies a positive-going output that varies from +2-V to +6-V top. The D section adds the and C outputs. 

Read:Stabilized Capacitance Buffer Circuit Diagram


Thus, by varying the output, the circuit output varies smoothly from -2-V to +2-V peak. The circuit can, of course, also be used as a 07180 phase switcher. For instance, with a ground-centered sine-wave input of 4V p-p, the output varies from 4-V p-p in phase with the input, smoothly through 0 V, to 4V p-p 180 out of phase with the input.
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Buffer 50Mhz Trigger Circuit Diagram

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This is a simple Buffer 50Mhz Trigger Circuit Diagram, This has a stable trigger 100 m V sensitivity at 50 MHz. The FETs comprise a simple high-speed buffer and the LT1016 compares the buffer`s output to the potential at tbe trigger level potentiometer, which can be of either polarity. The 10-KO resistor provides hysteresis, eliminating `chattering`` caused by noisy input signals. To calibrate this circuit, ground the input and adjust the input zero control for 0 V at Q2`s drain terminal.Read: Stabilized Capacitance Buffer Circuit Diagram

Buffer 50Mhz Trigger Circuit Diagram



Buffer 50Mhz Trigger Circuit Diagram
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Build a Power Doorbell Circuit Diagram

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Build a Power Doorbell Circuit Diagram, In this circuit define when the doorbell switch is pressed, the two monostable stages are activated in sequence, applying bias to a pair of voltage-controlled resistor stages. These then modulate the outputs from a pair of tone generators. The resulting signals are fed to an audio amplifier, then to the speaker.Read: Simple Electronic Music Maker Circuit Diagram

Power Doorbell Circuit Diagram



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Alarm Voiecer For Bend Switch Circuit Diagram

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This is a Alarm Voiecer For Bend Switch Circuit Diagram. This is a cross-sectional diagram of a bend switch. They can be used as push button or even position sensors. This schematic diagram shows an oscillator, which is used as an alarm voiecer, triggered by a bend switch. Read: Simple Power On Reset Circuit Diagram

Alarm Voiecer For Bend Switch Circuit Diagram

Alarm Voiecer For Bend Switch Circuit Diagram


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Tica Tak Electronic Dice Circuit Diagram

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This is a Tica Tak Electronic Dice Circuit Diagram. In this circuit using when SI is pressed, counter U2 is driven by oscillator U1A/U1B and the count (0 through 6) is read on DISP1. Rl and CI determine the count rate, which should be fast enough to ensure a `random` count. Read : Build a Toy Siren Circuit Diagram

Tica Tak Electronic Dice Circuit Diagram


Tica Tak Electronic Dice Circuit Diagram

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Simple LED Wheel Of Fortune Circuit Diagram

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This is a Simple LED Wheel Of Fortune Circuit Diagram. This circuit is a 10-LED spinning wheel that `clicks` as the wheel passes each point. The rotation starts fast, then gradually slows down to a random stop (with a click at each position). After the rotation ceases, the selected LED stays lit for about 10 seconds, then goes out. The cycle restarts by depressing the push button switch. Read : Build a Toy Siren Circuit Diagram

Simple LED Wheel Of Fortune Circuit Diagram


Simple LED Wheel Of Fortune Circuit Diagram

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Simple But Latest Video/Audio Switcher Circuit Diagram

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Build a Simple But Latest Video/Audio Switcher Circuit Diagram, This channel selector selects video and stereo audio from any one of three different sources. The circuit should be constructed on a PC board with plenty of ground plane to minimize noise. Read: Simple Power Switching Circuit Diagram

Simple But Latest Video/Audio Switcher Circuit Diagram


Simple But Latest Video/Audio Switcher Circuit Diagram

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Digital Programmable Exactness Amplifier Circuit Diagram

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This is a Digital Programmable Exactness Amplifier Circuit Diagram. In this circuit the DG419looks into the high input impedance of the op amp, so the effects of Rvs(o`l are negligible. The DG441 is also connected in series with RIN and is not included in the feedback dividers, thus contributing negligible.


Digital Programmable Exactness Amplifier Circuit Diagram


Digital Programmable Exactness Amplifier Circuit Diagram


Because the DG419 and DG441 can handle ±15 V, the unity gain follower connection, Xl, is capable of the full op-amp output range of ± 12 V. Read: Low Distortion Amplifier cum Compressor Circuit Diagram
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Build a Audio Controlled Mains Switch Circuit Diagram

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This is a simple Audio Controlled Mains Switch Circuit Diagram. Simple but very forkful project for audio liker circuit. This circuit will switch off the line supply to audio or video equipment if there has been no input signal for about 2 seconds. SI provides manual operation and S2 acts as a reset. This circuit allows for time to change a tape or compact disc.About 50 mV of audio signal is necessary. Read:  Solid-State Switch For Dc-Operated Gadgets


Audio Controlled Mains Switch Circuit Diagram


Build a Audio Controlled Mains Switch Circuit Diagram

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Simple Tactful Triac Controller Circuit Diagram

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Simple Tactful Triac Controller Circuit Diagram. This is the sensitive triac circuit in this circuit the single transistor connected between the capacitor and the common side of the ac line allows a logic-level signal to control this triac power circuit. Resistor R2 prevents false triggering of the triac by the trickle current through the diac.

Simple Tactful Triac Controller Circuit Diagram


Simple Tactful Triac Controller Circuit Diagram

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One Condition Trimming Circuit Diagram

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One Condition Trimming Circuit Diagram. This relatively simple, inexpensive circuit requiring one trimming operation can multiply or divide with a consistent accuracy of greater than 1 part in 1,000. An inexpensive CMOS version of standard 555 timer chip T, in conjunction with low-drift LMll error amplifier A3, an inexpensive analog chopper switch SW, form a unique voltage-to-duty-cycle converter to produce the difficult transfer function necessary for accurate conversion. Read: Use 555 Build Spaceship Alarm

 One Condition Trimming Circuit Diagram


 One Condition Trimming Circuit Diagram


An unknown multiplicand voltage applied to the A3 error op amp circuit`s Y input controls the duty cycle of the timer through its pin 5 modulation input. The network between the sink-and-source output of the timer, pin 3, and the state trigger inputs, pins 2 and 6, cause the timer to oscillate. An error feedback signal from the timer`s discharge output, pin 7, represents the duty cycle. Integrating this duty-cycle signal with voltage reference REF representing full scale, and applying the result to the inverting input of A3, closes the feedback loop and insures high accuracy. Read: Rf Probe Circuit Diagram For vtvm

Multiplier X feeds into another LMll op amp, A1, which acts as a input buffer and scaler. A third LMll, A2, filters and buffers the Z output. Between A1 and A2, the timer`s duty-cycle output modulates the analog switches of a CD4066 to achieve the desired multiplier output. To perform division instead of multiplication, reconfigure the op amp A1 circuit with the use of jumpers. Amplifier A2 isn`t required in the division configuration. To calibrate the circuit, connect the X andY inputs together and apply 10 V. Read: DC to AC Inverter by IC 555

Then adjust the 10-turn span potentiometer to achieve a 10-V output at Z for multiplication, or 1 V for the division configuration. Also check for zero output at a zero multiplier input. The circuit is scaled for 0 -10 V inputs and outputs with a small overrage capability, but other scalings are possible. Star grounding or a heavy ground bus should be used to reduce offset problems that are unavoidable in this design.


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Best Holiday Lighting Sequencer Circuit Diagram

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Flasher bulbs use a bi-metallic strip which interrupts the series circuit when the lamp becomes hot.. This is a Best Holiday Lighting Sequencer Circuit Diagram. This is Integrated circuit Ul (a 555 oscillator/timer) is wired as a conventional pulse generator. The frequency of the pulse generator is controlled by potentiometer Rll. Resistor R2 puts a reasonable limit on the highest speed attainable. The output of the pulse generator is fed to the common clock input of U2, a 74C175 quad D-type flip-flop. 

 Best Holiday Lighting Sequencer Circuit Diagram


  Best Holiday Lighting Sequencer Circuit Diagram

Each flip-flop is configured so that its Q output is coupled to the D input of the subsequent flip-flop. Information on the D input of each flip-flop is transferred to the Q (and Q) outputs on the leading edge of each clock pulse. Switch S2 allows you to invert the information on the D input of the first flip-flop at any time during the cycle. This allows you to create a number of different sequences, which are determined by the state of the CQ output at the time of the switching. 

However, if S2 is switched to position while all outputs are high or all are low (which seldom occurs), the sequence stops and the outputs remain either all on or all off. If that happens, you only need to switch back to position A for at least one pulse duration, then back to position again. Likewise, S2 should be in position A (pin 4 connected to pin 14) each time the power is turned on. This is because the data on pin 4 must be a logic 1 in order to start a sequence; otherwise all outputs remain at logic 0, regardless of the clock pulses. Each output of the sequencing circuit is connected to an MOC3010 opto isolator/coupler (U3 through U6), which contains an infrared-emitting diode with an infrared-sensitive diac (triac driver or trigger) in close proximity. The diac triggers the triac, which carries the 117-volts ac. 

Each time that the infrared- emitting diode receives a logic 1, it turns on and causes the diac to conduct. With the opto isolator/coupler`s internal diac conducting, the triac turns on, and power is supplied to whatever load is plugged into the corresponding ac socket. So, the sequencing circuit and the 117-V ac outputs are optically coupled and are effectively isolated from each other. Power for the sequencing circuit is provided by a 6.3-V miniature transformer. The output of the transformer is rectified by a four-diode bridge circuit, the output of which is filtered by CI (1000- electrolytic capacitor). Capacitor C3 is added at the supply pin of IJ2 to suppress transients.
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Simple Electronic Music Maker Circuit Diagram

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Build a Simple Electronic Music Maker Circuit Diagram. This electronic music maker uses an astable oscillator circuit that is controlled by a photocell. The light falling on the photo cell controls the tone. By mounting the circuit in a box, you can control light-reading PCI with your hand.

Simple Electronic Music Maker Circuit Diagram


Simple Electronic Music Maker Circuit Diagram

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Build a Toy Siren Circuit Diagram

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This simple Toy Siren circuit for hobbyist and student who game liker, this is a very simple Toy Siren circuit,  This Toy Siren circuit can be built small enough to frt inside a toy. The Toy Siren circuit consists of a relaxation oscillator utilizing one uni-junction transistor (2N2646, MU10, TIS43). R2 and C2 determine the frequency of the tone. 

 Simple Toy Siren Circuit Diagram


 Simple Toy Siren Circuit Diagram


Pushing the button, SW1 charges up the capacitor and the potential at the junction of R2 and C2 rises, causing an upswing in the frequency of oscillation. On releasing the push-button the charge on C2 will drop slowly with a proportional reduction in the frequency of oscillation. Manual operation of the button at intervals of approximately 2 seconds will produce a siren sound.
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Best Frequency Comparator Circuit Diagram

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This is a digital circuit may arrive at your need, This circuit is a simple frequency comparator. The circuit Input 1 is used as a gating period, during which a single rising edge on input 2 will cause a logic 1 output-any other number, indicating non-identical frequencies causes a logic 0 output. ICla converts input 1 to a narrow pulse which initializes IC2 which forms a two-stage shift register clocked by input 2. 

 Best Frequency Comparator Circuit Diagram


Best Frequency Comparator Circuit Diagram


On the first edge of input 2 a logic 1 appears on the output of IC2b and for all subsequent inputs a logic 0 is present. At the end of the gating period this output is latched by IC3 forming the lock output.As this is only valid for one input period a monostable is added to the output to enable, for example, visual monitoring of the output. Either output from IC3 can be used depending on which state is most important. As connected the failure state is indicated.
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Build a Stabilized Capacitance Buffer Circuit Diagram

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This is a simplest Stabilized Capacitance Buffer Circuit Diagram. In this simple circuit using Ql and Q2 constitute a simple, high-speed FET input buffer. Ql functions as a source follower, with the Q2 current source load setting the drain-source channel current. The LT1010 buffer provides output drive capability for cables or whatever load is required. Normally, this open-loop configuration would be quite drifty because there is no de feedback. 

Stabilized Capacitance Buffer Circuit Diagram

Build a Stabilized Capacitance Buffer Circuit Diagram


The LTC1052 contributes this function to stabilize the circuit. It does this by comparing the filtered circuit output to a similarly filtered version of the input signal. The amplified difference between these signals is used to set Q2`s bias, and hence Ql `s channel current. Ql `s source line ensures that the gate never forward biases, and the 2000 pF capacitor at Al provides stable loop compensation. 

The rc network in Al`s output prevents it from seeing high-speed edges coupled through Q2`s collector-base junction. A2`s output is also fed back to the shield around Ql`s gate lead, bootstrapping the circuit`s effective in_put capacitance down to less than 1 pF.
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Simple Power On Reset Circuit Diagram

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This is a simple power on switching circuit. This type of reset pulse is ideally provided by this circuit. Because of the high input impedance of the Schmidt trigger, long reset pulse times may be achieved without the excess dissipation that results when both output devices are on simultaneously, as in an ordinary gate device (B). A reset pulse is often required at power-on in a digital system. See circuit diagram below.

Simple Power On Reset Circuit Diagram


Simple Power On Reset Circuit Diagram

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Build a 3 Channels LED Flasher Circuit Diagram

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Build a 3 Channels LED Flasher Circuit Diagram. Inserting two 1-MO resistors, R1 and R2, in the output stage of one of the circuit`s inverters limits the current needed by the oscillator tone more than a few pA. This circuit includes a CD4007 package, which has three CMOS inverters. It forms a standard three-inverter oscillator. Resistors R1 and R2, in series with separate drains on inverter pins 8 and 13, limit the oscillator`s supply current. Capacitor C1 and resistors R5 set the off time of the oscillator, C1; R6 sets the on time. 

 Three Years LED Flasher Circuit Diagram

Build a 3 Channels LED Flasher Circuit Diagram



A VN10KM small-power FET, current limited by R4, drives two HLMP-3300 LEDs. The LEDs consume about 20 mA for 1 ms. Their average current determines battery life. Since the LEDs in the circuit flash at 1 Hz, the average current drain is about 1/1000 of 20 mA, or 20 p.A. A 9-V battery should last about three years at the current drain-essentially the shelf life of an alkaline battery.
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Logarithmic Light Meter Circuit Diagram

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Build a Logarithmic Light Meter Circuit Diagram, this is a very simple circuit, A light meter is a device used to measure the amount of light, The meter reading is directly proportional! to the logarithm of the input light power. The logarithmic circuit behavior arises from the non linear diode injunction current/voltage relationship The diode in the amplifier output prevents output voltage from becoming negative (thereby pegging the meter), which may happen at low light levels due to amplifier bias currents. Rl adjusts the meter full-scale deflection, enabling the meter to be calibrated. 


Logarithmic Light Meter Circuit Diagram


Logarithmic Light Meter Circuit Diagram

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Simple Phase Controlled Dimmer Circuit Diagram

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Simple Phase Controlled Dimmer Circuit Diagram. This is the Simple Phase Controlled Dimmer Circuit Diagram,  Phase-control dimmers reduce the lamp brightness by cutting out part of the AC waveform. A phase-controlled dimmer delays the triac turn-on to a selected point in each successive ac half cycle. Use this circuit only for incandescent lamps, heaters, soldering irons, or universal motors that have brushes.


Simple Phase Controlled Dimmer Circuit Diagram


Simple Phase Controlled Dimmer Circuit Diagram

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Simple Adjustable Threshold Temperature Alarm Circuit Diagram

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Simple Adjustable Threshold Temperature Alarm Circuit Diagram. This is a simple temperature alarm circuit diagram, when Rl increases as temp decreases, the output of IC1 goes positive, turning on Ql. Ql conducts and causes Q2 to conduct, turning on the audible alarm. The threshold is set with potentiometer R2. 

Adjustable Threshold Temperature Alarm Circuit Diagram


Simple Adjustable Threshold Temperature Alarm Circuit Diagram

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Programmable Siren Circuit Diagram with LM380

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This is the simple programmable frequency adjustable rate siren circuit diagram with LM380. The LM380 operates as an astable oscillator with the frequency determined by R2/C2. Adding Ql and driving its base, with the output of a LM3900 wired as a second astable oscillator, acts to gate the output of the LM380 on and off, at a rate fixed by Rl/Cl.

Programmable Siren Circuit Diagram with LM380

Programmable Siren Circuit Diagram with LM380

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Simple Warble Tone Alarm Circuit Diagram

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This is a Simple Warble Tone Alarm Circuit Diagram. The circuit generates a warble-tone alarm signal that simulates the sound of a British police siren. IC1 is wired as an alarm generator and IC2 is wired as a 1 Hz a stable multivibrator. 

 Simple Warble Tone Alarm Circuit Diagram


Simple Warble Tone Alarm Circuit Diagram

The output of IC2 is used to frequency modulate IC1 via R5.The action is such that the output frequency of IC1 alternates symmetrically between 500 Hz and 440 Hz, taking one sound to complete each alternating cycle.
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Use 555 Build Spaceship Alarm Circuit Diagram

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This is ic based security circuit By using two 555 timers this circuit produces a low frequency tone that rises to a high frequency tone in a little over 1 second. Then the sound stops for about 0.3 seconds, thereafter the cycle repeats. To produce the alarm sound of the Star Trek spaceship.

Use 555 Build Spaceship Alarm Circuit Diagram


Use 555 Build Spaceship Alarm Circuit Diagram

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Simple Power Failure Alarm Circuit Diagram

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This is the Simple Power Failure Alarm Circuit Diagram, This circuit use as power failure alarm while the power is on, the relay is held open but when the power fails the buzzer-circuit contacts close. 


Simple Power Failure Alarm Circuit Diagram


Simple Power Failure Alarm Circuit Diagram

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Build a LF or HF field Strength Meter Circuit Diagram

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How to Build a LF or HF field Strength Meter Circuit Diagram ? That is a good question but i share with you friend short description may be you are very genius you can make it easily . In this circuit CI and LI resonate on the 1750 meter band, with coverage from 150 kHz to 500 kHz. LI can be slug-tuned for 160-to-190 kHz coverage alone or a 2.5 mH choke can be used for LI, if desired, using CI for tuning. A 1N270 germanium diode rectifies the RF signal and C2 is charged at the peak RF level. 

 LF or HF field Strength Meter Circuit Diagram


LF or HF field Strength Meter Circuit Diagram

This dc level is amplified by an LM358. The gain is determined by R2 and R3, 1 100-kilohm linear potentiometer that varies the dc gain from 1 to 100, driving the 50 microampere meter. This field strength meter need not be limited to LF use. The Table shows the LI and CI values for HF operation and broadband operation.
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Simple Ground Tester Safety Circuit Diagram

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Simple Ground Tester Safety Circuit Diagram. This circuit is very simple and easy safety ground tester circuit, This circuit checks the reliability of appliances so that the equipment may be used safely. The test circuit must be plugged into a properly wired three terminal wall outlet. 

When a two-lead or three-lead appliance is plugged into circuit outlet SOI, neon lamps NE1 and NE2 will light if the appliance is safe. If neon NE2 is lit the appliance is dangerous, because the neutral lead is 110 Vac above ground.

Simple Ground Tester Safety Circuit Diagram

Simple Ground Tester Safety Circuit Diagram

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Build a Home Alarm Loop Circuit Diagram

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Every one need security him home to day i share a article about house alarm. How to Build a Home Alarm Loop Circuit Diagram ? This is a simple loop alarm circuit , This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The triggering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for resetting the circuit to stand-by mode again.It uses 4001 and 4011 gates and one NPN transistor who drives the siren.

Home Alarm Loop Circuit Diagram

Build a Home Alarm Loop Circuit Diagram

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Simple Bug Detector Circuit Diagram

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Simple Bug Detector Circuit Diagram. This circuit is a best security circuit diagram. This is a Simple Bug Detector Circuit Diagram, This rf detector can locate low-power transmitters (bugs) that are hidden from sight. It can sense the presence of a 1-mW transmitter at 20 feet. which is sensitive enough to detect the tiniest bug. As you bring the rf detector closer to the bug, more and more segments of its LED bar-graph display light, which aids in direction finding. 

Simple Bug Detector Circuit Diagram

Simple Bug Detector Circuit Diagram
 

The front end has a two-stage wide-band rf amplifier, and a forward-biased hot-carrier diode for a detector. After detection, the signal is filtered and fed to IC1, an LM3915N bar-graph driver having a logarithmic output. Each successive LED segment represents a 3-dB step.


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Wailing Alarm Circuit Diagram

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Wailing Alarm Circuit Diagram. This alarm siren circuit produce warbling sound, you can use it in your toys or in security alarm. This circuit simulates the sound of an American police siren. IC2 is wired as a low frequency a stable that has a cycling period of about 6 seconds. 

 Wailing Alarm Circuit Diagram


Wailing Alarm Circuit Diagram


The slowly varying ramp waveform on Cl is fed to pnp emitter follower Ql, and is then used to frequency modulate alarm generator IC1 via R6. IC1 has a natural center frequency of about 800Hz. Circuit action is such that the alarm output signal starts at a low frequency, rises for 3 seconds to a high frequency, then falls over 3 seconds to a low frequency again, and so on ad infinitum.
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Build a Photo Alarm Circuit Diagram

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Build a Photo Alarm Circuit Diagram. This circuit is an application for an alarm. The alarm rings, you can see the your photos, family, lover, friends. This circuit use LDR1, a cadmium sulphide (CDS) photo resistive cell is used as the lower leg of a voltage divider between Vcc and ground. The timer terminals 2 and 6 are connected to the junction of the photocell and SENSITIVITY control Rl. 

Photo Alarm Circuit Diagram

Photo Alarm Circuit Diagram
 

The resistance of the photo resistive cell varies inversely as the light intensity; resistance is high when the illumination level is low; low in bright light. (The Radio Shack CDS cell 276-116 has a typically wide resistance range€”about 3 megohms in darkness and 100 ohms in bright light.) When the light is interrupted or falls below a level set by SENSITIVITY control Rl, the rise in LDRl's resistance causes the voltage on pins 2 and 6 to rise. If the control is set so the voltage rises above 2A Vcc, the relay pulls in. 

The relay drops out when the light level increases and the drop across the photocell Ms below lA Vcc.(The circuit can be modified by placing relay K1 and diodeD1 between pin 3 and ground. In this case, the relay drops out when the voltage on pins 2 and 6 rises above V% Vcc, and pulls in when it falls below Vi Vcc. This modification is valuable when the relay has single-throw contacts.) Opening and dosing of the relay contacts occurs at different illumination levels. This J/3 Vcc hysteresis is an advantage that prevents the circuit from hunting and the relay from chattering when there are very small changes in illumination.
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Second Parallel Loop Alarm Circuit Diagram

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I share with you first Parallel Loop Alarm Circuit Diagram and to day i share with you second Parallel Loop Alarm Circuit Diagram. This circuit is 4 parallel switch circuit.  Four parallel switches are used to monitor four positions. When a closure occurs on any switch, SCR1 triggers, which sounds the alarm. The alarm should be of the non interrupting type.


Second Parallel Loop Alarm Circuit Diagram

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Top 70 High Paying Google Adsense Keywords 2013

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You may have noticed that Adsense now-a-days is paying very low money by One Click,usually it is .10$ to .20$.The main reason is that we are not using Keywords in our Blogs Articles.Actually the Adsense CPC (Cost Per Click) depends upon the Blog Niche(i.e what the blog is about) and the related high paying keywords.Now Time to increase AdSense Revenue.The secret of boosting AdSense Earning is High Paying Keywords,actually these keywords helps you to increase your Adsense CPC(Cost Per Click).As a result of increasing CPC(Cost per Click) you will get a huge amount of money from One Click On Google Ads.Actually sometime Google Ads Cost became to high i.e may be up-to 5$ per Click.The Secret behind these earning is high paying keywords,so in this regard we have collected some Google Adsense high Paying Keyword,which will certainly increase your AdSense Daily Earning.

How Does Keywords Increase Adsense Earning?

As i mentioned that AdSense Earning Depends upon the blog/website niche and high paying related keywords which we use in blog articles.Now if your Blog Articles contain any of the following High Paying Keyword,then surely you can boost your AdSense Earning.Therefore don,t waste your time and start using the below keywords in blog posts and enjoy earning alot of money.

Google Adsense High Paying Keywords 2013

There are many new bloggers who takes month or years to cashout his/her first AdSense Cheque of 100$,the reason is their AdSense CPC is low and as a result they face alot of Problems.Therefore we are providing a huge list of Google Adsense high paying Keyword,i can guarantee you,if you used these keywords,you can earn alot of money.


Keywords
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    $95.74
ONLINE MOTOR INSURANCE QUOTES
    $95.73
ONLINE COLLEDGES
    $95.65
PAPERPORT PROMOTIONAL CODE
    $95.13
ONLINECLASSES
    $95.06
WORLD TRADE CENTER FOOTAGE
    $95.02
MASSAGE SCHOOL DALLAS TEXAS
    $94.90
PSYCHIC FOR FREE
    $94.61
DONATE OLD CARS TO CHARITY
    $94.55
LOW CREDIT LINE CREDIT CARDS
    $94.49
DALLAS MESOTHELIOMA ATTORNEYS
    $94.33
CAR INSURANCE QUOTES MN
    $94.29
DONATE YOUR CAR FOR MONEY
    $94.01
CHEAP AUTO INSURANCE IN VA
    $93.84
MET AUTO
    $93.70
FORENSICS ONLINE COURSE
    $93.51
HOME PHONE INTERNET BUNDLE
    $93.32
DONATING USED CARS TO CHARITY
    $93.17
PHD IN COUNSELING EDUCATION
    $92.99 
NEUSON
    $92.89
CAR INSURANCE QUOTES PA
    $92.88
ROYALTY FREE IMAGES STOCK
    $92.76
CAR INSURANCE IN SOUTH DAKOTA
    $92.72
EMAIL BULK SERVICE
    $92.55
WEBEX COSTS
    $92.38
CHEAP CAR INSURANCE FOR LADIES
    $92.23
CHEAP CAR INSURANCE IN VIRGINIA
    $92.03
REGISTER FREE DOMAINS
    $92.03
BETTER CONFERENCING CALLS
    $91.44
FUTURISTIC ARCHITECTURE
    $91.44
MORTGAGE ADVISER
    $91.29
CAR DONATE
    $88.26
VIRTUAL DATA ROOMS
    $83.18
AUTOMOBILE ACCIDENT ATTORNEY
    $76.57
AUTO ACCIDENT ATTORNEY
    $75.64
CAR ACCIDENT LAWYERS
    $75.17
DATA RECOVERY RAID
    $73.22
MOTOR INSURANCE QUOTES
    $68.61
PERSONAL INJURY LAWYER
    $66.53
CAR INSURANCE QUOTES
    $61.03
ASBESTOS LUNG CANCER
    $60.96
INJURY LAWYERS
    $60.79
PERSONAL INJURY LAW FIRM
    $60.56
ONLINE CRIMINAL JUSTICE DEGREE
    $60.4
CAR INSURANCE COMPANIES
    $58.66
BUSINESS VOIP SOLUTIONS
    $51.9
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