### Magnetic Induction - The Flip Side

previously, we discussed the fact that a wire conducting an electric current, generates a magnetic field around it. Along the same lines, when a magnetic field, radiating from a permanent magnet, passes through a wire or coil of wire, it induces an electrical current on the wire. To state this another way, just as a current in a wire generates a magnetic field - a magnetic field passing through a wire generates a current.

We can monitor this action by placing a meter across the wire. When we approach a wire with a magnet, the wire cuts the magnetic field and we see the meter needle move.

In this way, we can "generate" electricity by moving a magnet in close proximity to a wire. The stronger the magnetic field, the more current flows through the wire. There is a catch though. If we stop the movement of the wire, right in the middle of the field, one would think that electrical current would continue to be generated. Actually, this is not the case. The magnetic field must be moving in relation to the wire in order for a current to be generated in the wire. In other words, either the magnet, or the wire must be moving. And the faster the wire passes through the field, the more current is generated.

Now we know that according to the physical law of CONSERVATION OF ENERGY that no energy is ever lost or gained. So the energy generated in the wire can't just come out of the blue. It must be transformed from some other sort of energy. The question being, does it come from the magnetic field, or from the motion? The answer is that the energy is transformed from mechanical momentum into electrical current.

This is the principle behind an electric generator. If we take a wire coil, and place it on a rotating shaft, then we can spin the coil. If the shaft runs midway between two permanent magnets, we can control the movement of a coil of wire between two magnetic poles. Thus, it is possible to generate electricity by spinning the coil upon the shaft, because the wire is in constant motion within the magnetic field. The motion is transformed into electricity via the magnets. The electricity goes out to the world from the terminals, by way of the brushes and slip rings. This will be explained in more detail in a later lesson. The important point to remember is that we can generate magnetism with a wire conducting electricity, and we can generate electricity with magnets.

### 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 …