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Showing posts from December, 2013

### Current-Driven Sallen Key Filter Circuit Diagram

Current-Driven Sallen Key Filter Circuit Diagram he low-pass Sallen-Key filter is staple for designers because it contains few components (A). By redesigning the filter, a current to voltage conversion can be avoided when the input signal to be filtered is in current form (B).
Current-Driven Sallen Key Filter Circuit Diagram

### Build a Triac 0 Point Switch Circuit Diagram

How to Build a Triac 0 Point Switch Circuit Diagram. The point where the line voltage is 0 V is the Zero CrossOn the initial part of the positive half cycle, the voltage is changing rapidly from zero causing a large current to flow into capacitor C2. The current through C2 flows through R4, D3, and D4 into the gate of the TRIAC Q2 causing it to turn on very close to zero voltage. Once Q2 turns on, capacitor C3 charges to the peak of the line voltage through D5.
Triac 0 Point Switch Circuit Diagram
When the line voltage passes through the peak, D5 becomes reverse-biased and C3 begins to discharge through D4 and the gate of Q2. At this time the voltage on C3 lags the line voltage. When the line voltage goes through zero there is still some charge on C3 so that when the line voltage starts negative C3 is still discharging into the gate of Q2.
Thus Q2 is also turned on near zero on the negative half cycle. This operation continues for each cycle until switch SI is closed, at which time SC…

### Simple Hexfet Switch Circuit Diagram

This is a Simple Hexfet Switch Circuit Diagram. Drive Requirements and Switching Characteristics of Logic Level. HEXFET. The HEXFET can swatch dc power to relays (as shown in A), motors, lamps, and numerous other-devices. That arrangement can even be used to switch resistors in and out of a circuit, as shown in B. Rl, R2, and R3 represent resistive loads that can be switched in and out of the circuit.
Simple Hexfet Switch Circuit Diagram

### Simple LED Electronic Roulette Circuit Diagram

LED Electronic Roulette Game Student Project. This is a Simple LED Electronic Roulette Circuit Diagram. Electronic Roulette (roo-let) replaces the ivory ball with a circuit of flashing light emitting diodes (LED's). In this project Ul (a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode) is used to produce a low-frequency, pulsed output of about 40 Hz. The VCO's frequency range is determined by R6 and C2, which can be altered by varying the voltage at pin 9.
Simple LED Electronic Roulette Circuit Diagram
The rising voltage causes the frequency to rise from zero to threshold and remain at that frequency as long as SI is closed. When SI is opened, Cl discharges slowly through Rl to ground and the voltage falls toward zero. That produces a decreasing pulse rate. The output of Ul at pin 4 is connected to the clock input of U2 (a 4017 decade decoder/driver) at pin 14 via C3.
U2 sequentially advances through each of…

### Simple Dual Bell Circuit Diagram

This is a very simple dual bell circuit diagram. It is often desirable for a single doorbell to be operated by two buttons, for instance, one at the front door and the other at the back door. The additional button, S2 in series with the break contact of relay Rel, is connected in parallel with the original bell-push, SI. When S2 is pressed, the bell voltage is rectified by D1 and smoothed by CI. After a time, t = R{R2C2, the direct voltage across C2 has risen to a level here T1 switches on.
Simple Dual Bell Circuit Diagram

Relay Rel is then energized and its contact breaks the circuit of S2 so that the bell stops ringing. After a short time, CI and C2 are discharged, the relay returns to its quiescent state and the bell rings again.In this way, SI will cause the bell to ring continuously, wliile S2 makes it ring in short bursts, so that it is immediately clear which` button is pushed.

### High Gain Wide Bandwidth Op-Amp Circuit Diagram

Ideal op-amps have infinite open-loop gain at all frequencies. This is a simple High Gain Wide Bandwidth Op-Amp Circuit Diagram. You can build a composite amplifier featuring high gain, wide bandwidth, and good dc accuracy by cascading the sections of a dual video amplifier and adding two appropriate phase-compen-sation components. The op amp drives a 150- load and provides a closed-loop gain of 40 dB.
High Gain Wide Bandwidth Op-Amp Circuit Diagram

### IC 7805 Turn-On VR Circuit Diagram

This is a simple IC 7805 based Turn-On  VR Circuit Diagram. IC 78XX Series includes three terminal positive voltage regulators commonly available in TO 220 package. These are useful in wide range of applications to give precise output voltage. These regulators have internal current limiting, and thermal shutdown circuitry etc.A logic level can control a 7805 regulator with this circuit. Q2 is a series switching transistor controlled by Ql. Ql is turned on by a logic voltage to its base.
IC 7805 Turn-On  VR Circuit Diagram

### 2 Way Remote Ac Switch Hookup Circuit Diagram

Once it is connected to your network, the remote access via the App is a nice feature.. This switching arrangement is the type of arrangement used in both domestic and industrial environments to allow a light or other ac-operated device to be controlled from more than one location.
2 Way Remote Ac Switch Hookup Circuit Diagram

### Build a High input comparator Circuit Diagram

This is a simple  High input comparator Circuit Diagram. The inputs of an ideal comparator exhibit infinitely high input resistance, and thus no current flows into its inputs. The circuit uses both halves of the CA3290 BiMOS dual voltage comparator. The LED will be turned `ON` whenever the input signal is above the lower limit (VL) but below the upper limit (Vy).
High input comparator Circuit Diagram

### Simple AC Static Single Pole Double Throw Switch Circuit Diagram

This is a Simple AC Static Single Pole Double Throw Switch Circuit Diagram. SPDT is a a simple type of changeover electrical switch. An SPDT solid state relay is shown. When voltage is applied Ql will turn on, activating load 1, because the full line voltage appears across Q2, supplying gate current through Rl. When SI is closed. Q2 turns on removing the gate drive from Ql and activating load 2.

AC Static Single Pole Double Throw Switch Circuit Diagram

### Simple Twilight Switch Circuit Diagram

Flashing light is very useful in order to indicate any obstruction or working in progress. The circuit automatic flashing light with twilight switch flash light in dark but during day it automatically turns off itself. The circuit as dusk begins to -fall, the sensor (a cadmium-sulfide light-dependent resistor or LDR) operates a small horn to provide an audible reminder that it's time to turn on your lights.
Simple Twilight Switch Circuit Diagram

To turn the circuit off simply turn your headlights on and the noise stops. The base of Ql is fed through a voltage divider formed by R4, LDR1a light-dependent resistor with an internal resistor of about 100 ohms under bright-light conditions and about 10 megohms in total darkness potentiometer R6. Ql's base voltage depends on the light level received by LDR1 and the setting of R6. If LDR1 detects a high light level, its resistance decreases, thereby providing a greater base current for Ql, causing it to conduct.
When Ql conducts, pin 4…

### Simple Power Op Amp Circuit Diagram

This is a best electronic circuit for engineers, students and hobbyist this is a simple circuit diagram. This Simple Power Op Amp Circuit Diagram from Apex Micro technology can deliver 180 V p-p @ 90 kHz into a 4- load. The PA04 can deliver 400-W RMS into an 8- load with low THD at frequencies beyond 20 kHz. Make this circuit care fully and enjoy this one.
Simple Power Op Amp Circuit Diagram

### Digital Electronic Dice Circuit Diagram

Simple and digital electronic dice game circuit diagram, this is a simple circuit. Powered Board Games is a new category of board games they are digital and can be played using a tangible electronic dice. In this circuit Six LEDs are arranged to produce a display the same as the dots on a dice. When PBI is depressed, the display is blanked and the oscillator (ICl a, b, c) clocks IC2 at about 1MHz. IC2 counts from zero and resets on seven When PBI is released, the display is enabled and a decoding system (IC3) produces the correct output on the LEDs.
Digital Electronic Dice Circuit Diagram

### Simple Voice Switch on Circuit Diagram

This is a simple voice activated or switch on circuit diagram. With this sound activated switch, control by sound may be very useful, not just on a robot but also for a bit of home automation.This circuit provides either latched switching or timed switching. U1A and UlB provide audio amplification from the microphone. U2 is a retriggerable monostable multivibrator.
Simple Voice Switch on Circuit Diagram

SI A and SIB select either U3, a flip-flop, or U2. R13 and R14 allow a 6- to 60-second timer delay after the sound ceases, in the timed mode. BR1, U5, and associated components form a power supply. Ql drives opto coupler U4 and triggers triac TRl. -If desired, four silicon diode rectifiers connected as a bridge can be substituted for BR1. Just make certain the diodes are rated at least 50V, 1A.

### A Gift Mobile phone Jammer Circuit Diagram

I am most thankful of www.circuitsproject.com. If we are speaking about professional Cell phone Jammers we are talking about this schematic below. First off all you should be very careful how to use this device. Its fully illegal and so the purpose I post this Circuit is only for educational and testing reasons. This type of device is being used by security for VIPS, specially at their limousines to avoid bomb triggering while the car passes from the target cell phone-bomb. Offcourse there are those who use it to make a joke or to make the people crazy in the square block you are.
The power of the jammer is already enough to do your thing, but certainly you can place a 30W linear power amp at the RF output and block a much wider area. So, Be nice person with that and remember that there are people who may need desperately to receive or make a call and one of them could be you! And if you can't resist of operating the jammer do it for few secs. Do not forget that if you connect lin…

### Simple Cable Bootstrapping Circuit Diagram

This is a Simple Cable Bootstrapping Circuit Diagram. Bootstrapping or booting refers to a group of metaphors which refer to a self-sustaining process that proceeds without external help. In computer science, bootstrapping is the process of writing a compiler.In this circuit Bootstrapping input shield for a follower reduces cable capacitance, leakage, and spurious voltages from cable flexing Instability can be avoided with small capacitor on input.
Simple Cable Bootstrapping Circuit Diagram

### Build a Preamplifier Transmit Receive Sequencer Circuit Diagram

How to Build a Preamplifier Transmit Receive Sequencer Circuit Diagram? This is a simple circuit and this circuit is useful in amateur radio VHF and UHF work where a mast-mounted antenna Preamplifier is used for receiving. The kit controls T-R switching and change-over relay sequencing so that high RF levels are prevented from accidentally being applied to the preamplifier during switching intervals.
Preamplifier Transmit Receive Sequencer Circuit Diagram

### Simple Reaction Timer Circuit Diagram

This is a Simple Reaction Timer Circuit Diagram. This simple circuit uses a timer to generate pulses at a 5-ms clock rate. The pulses are shifted into the shift register, one at a time, lighting an LED. An auxiliary timer that generates one pulse per second is used to generate timing to activate the `go` LED and start the 5 ms pulses clocking into the registers. At the go signal each player presses his buttons (S3 or S4). The delay (reaction time) is read out on LED 4 to LED 17; after six seconds, the sequence repeats.
Simple Reaction Timer Circuit Diagram

### Build a Low Noise And Drift Composite Amp Circuit Diagram

How to Build a Low Noise And Drift Composite Amp Circuit Diagram. This circuit offers the best of both worlds. It can be combined with a low input offset voltage and drift without degrading the overall system`s dynamic performance.
Low Noise And Drift Composite Amp Circuit Diagram

Compared to a standalone FET input operational amplifier, the composite amplifier circuit exhibits a 20-fold improvement in voltage offset and drift. In this circuit arrangement, A1 is a highspeed FET input op amp with a closed-loop gain of 100 (the source impedance was arbitrarily chosen to be 100 kfl). A2 is a Super Beta bipolar input op amp. It has good dc characteristics, biFET-level input bias current, and low noise. A2 monitors the voltage at the input of A1 and injects current to Al`s null pins. This forces A1 to have the input properties of a bipolar amplifier while maintaining its bandwidth and low-input-bias-current noise.

### Simple Electromagnetic Ring Launcher Circuit Diagram

This is a Simple Electromagnetic Ring Launcher Circuit Diagram. The electromagnetic ring launcher is comprised of.four sub circuits: a clock circuit (built around U5, a 555 oscillator/timer configured for astable operation), a count-down/display circuit (built around U3), a 74190 synchronous up/down counter with BCD outputs that is configured for countdown operation;
Simple Electromagnetic Ring Launcher Circuit Diagram

U4, a ECG8368 BCD-to-7-segment latch/decoder/display driver; and DISP1, a common-cathode seven-segment display), a trigger circuit (comprised of U6), an MOC3010 opto isolator/ coupler with Triac-driver output; TR1, an SK3665 200-PIV, 4-A Triac; and a few support components), and a reset circuit (comprised of Ul, a 7400 quad 2-input NAND gate U2, a second 555 oscillator/timer configured for monostable operation; and a few support components). This circuit is that of a repulsion coil (LI) used to demonstrate the principle of electromagnetic repulsion by propelling a metal…

### Model Rocket Launcher Circuit Diagram

Model Rocket Launcher Circuit Diagram is a fun and educational hobby. However, it is important to always follow the safety rules for the most enjoyable experience. The circuit consists of the launch timer itself and an automatic-off timer. When power is applied to that IC, the countdown LED's sequence is on until they are all lit. When the last one LED1, is fully lit, transistor Ql saturates, energizing RY2.
Model Rocket Launcher Circuit Diagram

When that happens, a circuit between the lantern battery at the launch pad and the nickel-chromium wire is completed; the wire heats up as before, and the rocket is launched. Resistor R4 and capacitor C3 determine the countdown timing; with the values shown it should be approximately 10 seconds. Resistors R3 and R5 set the LED brightness. Safety is of the utmost importance.
That's the purpose of the second half of the circuit. When RY2 opens, the current flow to Q2 is disrupted. But, because of the presence of R2 and C4, the transisto…

### 0 Voltage Switching Circuit Diagram

This is a simple 0 Voltage Switching Circuit Diagram. In this simple circuit the SCR coupler circuit provides higher sensitivity to input signals as illustrated. This allows the lower cost 4N39 (H11C3) to be used with the > 7 mA drive currents supplied by the input circuit.

0 Voltage Switching Circuit Diagram

### Simple Battery Saving Disconnect Switch Circuit Diagram

This is a Simple Battery Saving Disconnect Switch Circuit Diagram. At a predetermined level of declining terminal voltage, the circuit disconnects the battery from the load and halts potentially destructive battery discharge. Ql, a high-side, floating-source MOSFET, acts as the switch. The overall circuit draws about 500 when the switch is closed and about 8 when it`s open.
Battery Saving Disconnect Switch Circuit Diagram

The values of ii, R2, and R3 set the upper and lower voltage thresholds, Vv and VL, according to the relationships For the circuit to start, V+ must exceed VO. The voltage detector IC1 then powers IC2, but only while V+ remains above VL. Otherwise, IC2 loses its power, removes gate drive from Ql, and turns it off. IC2 is a dual chaige-pump inverter that normally converts 5 V to + 10 V. Capacitors CI, C2, and the two associated diodes form a voltage tripler that generates a gate drive for Ql that is approximately equal to two times the battery voltage.
With the values…

### Build a Safe Opamp Circuit Diagram

Build a Safe Op-amp Circuit Diagram. This is a Safe opamp circuit diagram, In intrinsically safe applications, it is sometimes necessary to separate sections of circuitry by resistors which limit current under fault conditions.
Safe Opamp Circuit Diagram

The circuit shown provides an accurate analogue output with effectively zero output impedance, despite having resistors in series with the output. which is independent of RA and RB. The values of RA and RB should be chosen to achieve the desired current limiting, but note that a proportion of the voltage given at the op-amp output will be dropped across these resistors. Any type of op amp would be suitable.

### Digital Color Organ Circuit Diagram

This is a simple Digital Color Organ Circuit Diagram. If you like lights and music, you'll have fun building this Color Organ. You plug your music into it, and the circuit divides the sound into high, mid, and low . Three lights are controlled by the three channels. One light will pulse in response to the bass, another illuminates with mid-range sounds, and the last lights for high notes. Four level controls allow adjustment of overall light level and each channel individually Up to 200 watts per channel can be handled.
Digital Color Organ Circuit Diagram

### Simple Light Chaser I Circuit Diagram

Simple Light Chaser I Circuit Diagram.Chase lights (or chaser lights) are often associated with the marquee signs of some movie theaters, and have also been used as a common element of television. Light Chasers is an album by Cloud Cult.In this circuit Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (Ul) 4017 decode counter sequences 10 LEDs whose common anode is returned through a second (U2) CD4017, which counts at one-tenth of the rate. The flash rate is controlled by U3, a clock circuit, with a 555 timer. View:Artificial random Simulated Flicker Sequencer Circuit Diagram
Simple Light Chaser I Circuit Diagram

### Simple Toss A Coin Binary Box Circuit Diagram

This is a Simple Toss A Coin Binary Box Circuit Diagram. The entropy of such a process is given by the binary entropy function. This Circuit uses an astable multivibrator to vary the heads-or-tails condition, and a flip-flop to store the condition given by the multivibrator Consequently, the circuit is wired so that the flip-flop`s state is changed once for each full cycle the multivibrator goes through to assure an absolutely even 50-50 chance of a heads or tails loss.
Simple Toss A Coin Binary Box Circuit Diagram

### Gain-Controlled Amplifier Circuit Diagram

This is a simple Gain-Controlled Amplifier circuit diagram.This single-chip circuit adjusts its audio gain according to the ambient noise picked up by the microphone. When operating in a quiet environment, the audio output is quiet, while a noisy environment results in a louder audio output. Audio to pin 13 is amplified by the variable-gain amplifier within the LM1894 IC. Audio from the microphone connected through 0.1-/iF capacitor to pin 6 controls the audio gain of the variable-gain amplifier. The output appears on pin 11 and is taken off through an 0.1-/xF capacitor.
Gain-Controlled Amplifier Circuit Diagram

### Simple Electronic Safety Switch Circuit Diagram

This is a Simple Electronic Safety Switch Circuit Diagram. In this circuit use SI and S2 must be depressed within 200 ms of each other to activate Kl. The hold Lime is adjustable via K7.SI and S2 overlap time can be changed by changing Cl and C2 or Rl and R2.
Electronic Safety Switch Circuit Diagram

### Digital Electronic Slot Machine Circuit Diagram

Most modern slot machines are designed to look and feel like the old mechanical models, but they work on a completely different principle. The outcome of each pull is actually controlled by a central computer inside the machine, not by the motion of the reels.. The slot machine`s realistic action is provided by seven ICs and three displays, as shown.Read : Tica Tak Electronic Dice Circuit Diagram
Digital Electronic Slot Machine Circuit Diagram

Two 555 CMOS timer ICs generate pulses. IC1 is used to generate the clock pulses for the entire electronic slot machine. The pulses are coupled from the output (pin 3) to the clock inputs of IC4, IC5, and 1C6, the display-driver ICs. The displays are common-cathode 7-segment LED types. They are wired to display three different symbols, an L, a 7, and bar, When all three displays show the same symbols, IC7 (a 4023 triple 3-iriput NAND gate) decodes a winner and sends a signal to pin 5 of IC3. Read: Build a Toy Siren Circuit Diagram
That IC is a 400…

### Simple Buffered Analog Switch Circuit Diagram

This is the Diode–transistor logic and Transistor–transistor logic Simple Buffered Analog Switch Circuit Diagram. This analog switch uses the 2N4860 JFET for its 25 ohm ron and low leakage. The LM102 serves as a voltage buffer. This circuit can be adapted to a dual trace oscilloscope chopper. The DS7800 monolithic IC provides adequate switch drive controlled by DTL/TTL logic levels.
Buffered Analog Switch Circuit Diagram

### Zero Crossing Detector Circuit Diagram

This is the simple Schmidt trigger zero crossing detector circuit diagram. This circuit has a 100 mV hysteresis which can be used in applications where very fast transition times are required at the output even though the signal is very slow. The hysteresis loop also reduces false triggering due to noise on the input. The waveforms show the trip points developed by the hysteresis loop.
Zero Crossing Detector Circuit Diagram

### Simple Blare Switch Circuit Diagram

This is the simple Blare Switch Circuit Diagram. To make such a sound or series of sounds otherwise, as by blowing on some device. At the heart of the whistle swatch are a pair of tone detectors, each of which is built around an LM567 tone decoder, which are supported by a minimum of additional components.
Read: 50W Offline Switching Power supply Circuit Diagram
Blare-whistle Switch Circuit Diagram

This whistle switch is designed to respond to only two or more occurrences of a specific tone, or sequence of tones, within a specified period to prevent false triggering. Depending on the relay used, various ac loads can be controlled. Microphone MICl picks up the sound and U2 amplifies the signal and feeds it to tone decoders U3 and U4. These devices trigger U5-a and U5-b and the logic circuits that drive relay Kl.

### Build a Non Inverting Ac Amplifier Circuit Diagram

This is best buffer circuit, in this Non Inverting Ac Amplifier Circuit Diagram utilize for audio of other low-frequency applications is shown. Design equations are in the figure. Almost any general-purpose op amp can be used for U1.
Non Inverting Ac Amplifier Circuit Diagram

### Linear Variable Differential Transformer Circuit Diagram

This is the linear variable differential transformer driver demodulator circuit diagram. A very simple motion transducer can be constructed using the circuit shown. The output is biased to one-half the supply voltage. This requires special interface circuitry for the signal readout.
Linear Variable Differential Transformer Circuit Diagram

One simple method is to use a zero center meter in a bridge configuration. Displacement now can be measured as a positive or negative meter reading. Readout sensitivity is a function of the particular linear variable differential transformer and of the gain of the error amplifier. De offsets can be nulled by using a simple offset adjustment circuit as indicated.

### Build a Phone light Circuit Diagram

This is a simple Phone light Circuit Diagram. In this circuit When the phone does ring the triac is triggered into conduction by a signal applied to its gate (G) through a bilateral switch (diac), D2. The triac acts as a switch, conducting only when a signal is present at the gate.
Phone light Circuit Diagram

### Scarce Level Power Fet Driver Method Circuit Diagram

This is the Scarce Level Power Fet Driver Method Circuit Diagram. This circuit operates from a 16- to 50-V supply. Adding the buffer circuit (within the dashed lines) offers 100-ns switching times. Otherwise, the circuit switches in 1 /xs. Ql and R1 form a switched current source of about 12 mA.
The current flows through R2, which supplies 12 V to the FET. The circuit works well over a wide range of supply voltages. Furthermore, it switches smoothly in the presence of large ripple and noise on the supply.
Scarce Level Power Fet Driver Method Circuit Diagram

The switching time (about 1 /as) can be reduced considerably by lowering the values of Ri and R2 at the expense of higher power dissipation in the resistors and Ql. Alternatively, a buffer circuit can be added to produce switching times of 100 ns without generating significant power dissipation.

### Build a Diode Cmos Stabilizer Circuit Diagram

The simple diode network can stabilize the voltage supplied to CMOS circuitry from a battery. D1 and D2 must have a combined forward-voltage drop of about 1.5 V. And D3 is an LED with a forward-voltage drop of about 1.7 V. The table shows the network`s output voltage as the battery`s voltage declines.
Diode Cmos Stabilizer Circuit Diagram