### Circuits Circuits Everywhere!

In the last section, we saw how a very simple transmitter worked. It was made up of several different types of electronic components, including capacitors, transistors, resistors, etc. When we assemble several types of electronic components in a configuration that serves some purpose, we call it a CIRCUIT.

Some common electronic components are:
Wire
Resistors
Capacitors
Coils
Transformers
Tubes
Transistors
Diodes

All circuits are combinations of individual electronic components assembled to perform a function. The "type" of circuit it is, depends on the function of the circuit. We have already discussed some simple circuits, called "filters", and have also gone through "power supplies". Now we have introduced you to "amplifiers".

Here is a list of some of the major types of circuits we will discuss and explain how they operate:
Power Supplies
Filters
Amplifiers
Oscillators
Mixers
Logic Circuits
Almost any device or type of electrical equipment is made up of a COMBINATION of these circuits.

Our transmitter, for instance, is an Audio Amplifier, which drives an RF Mixer, which has a second input from the RF Oscillator (High Frequency Generator). The Mixer combines the inputs from the Audio Amp and the Oscillator to create a radio signal that is modulated by the audio signal, which then goes out to the antenna.

Of course this is an over simplification of what really has to happen, but the point is, that it is ALL done by basic circuits, and that if you learn and understand the simple circuits, you can look at VERY complex devices, and understand how they work!

We need to discuss each of the basic types of circuits in greater detail until you fully comprehend the theory behind how they work. Then you will have a firm grasp on electronics, and can begin combining them to create useful circuits.

First, let's cover the two electronic components we haven't covered yet:
Transistors and Diodes.

### 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.

### High Power Output Amplifier TDA7294

The famous SGS-THOMSON ST Microelectronics has introduced a Hi-Fi DMOS high-power amplifier circuit TDA7294, its sound great taste bile, which due to its internal circuit from input to output are field-effect devices, rounded sound Mild, delicate Rounuan.  However, with its assembly amplifier, only TDA7294 single-output power is only 70 W, BTL access law is 100 W from top to bottom, do not feel that power cushion. The author several tests, used to promote TDA7294-level, direct-drive one to four pairs of high-power transistor parallel, the output of strong currents, the power output of 400 W (mono), and the circuit is simple and no need to debug that can reliably work Basically, the IC has maintained a sound and performance.  Ruzuo The figure below shows, R6 for the feedback resistor, the author of the value in debugging 22 k Î© more appropriate, R6 also decided this circuit gain, the gain value will increase.  Quiescent current depends on the power of R7, R8, when its value…

### Full Power Mobile Phone Jammer Circuit Diagram

Full Power Mobile Phone Jammer Circuit Diagram.To day if we are talking about expert Cell phone Jammers we are conversing about this schematic underneath. First off all you should be very very cautious how to use this apparatus. Its completely illegal and so the reason. I post this Circuit is only for educational and testing causes. This type of apparatus is being utilised by security for VIPS, particularly at their limousines to avoid blasting device initiating while the vehicle passes from the goal cell phone-bomb. Off course there are those who use it to make a antic or to make the persons crazy in the rectangle block you are.
The power of the jammer is currently sufficient to do your thing, but certainly you can place a 30W linear power amp at the RF output and impede a much wider locality. So, Be pleasant individual with that and recall that there are people who may need desperately to obtain or make a call and one of them could be you! And if you can't oppose of functioning …