Series Resistance

Ohm's Law teaches us that Voltage is equal to the product of resistance and current. This is fine if we have a circuit as simple as a single light run by a battery. But how often do we truly encounter a circuit which has only one resistance? It is actually quite seldom. Most circuits have many resistances in various combinations. So we must learn how to mathematically deal with all these resistances. Fortunately, combined resistances can only be configured in two ways:
Resistances Combined in Series
Resistances Combined in Parallel
We will discuss each of these separately. This class is dedicated to the study of Resistances in Series, which you will find, are as simple as 2+2.

First, let us describe the difference between a SERIES circuit and a PARALLEL circuit. A SERIES circuit is hooked together like a chain, with each link connected to the link before it. If any given link in the chain is broken, the whole chain is broken, and doesn't work.

If we think of our circuit as a water pipe, a resistor could be a valve in the pipe. A series circuit would have several valves in the same pipe. If we shut the water off at any one valve, the water flow through the entire pipe would be restricted. Let's say this again another way. The flow, or current, is restricted by all the valves, but the valve with the most resistance is the one that decreases the flow the most.

Now if we draw a schematic of resistors in series, it would look like the diagram at the left. This first diagram would be an exact representation of our waterflow circuit. The tank provides a source of water, just as a battery supplies a source of electricity. The valves, which restrict the flow of water, represent the resistors, which restrict the flow of electric current.

The diagram on the right shows the equivalent circuit, with only one resistor (Rt) taking the place of all 3 resistors in the left diagram. Recall that using an electrical equivalent circuit, that ANY circuit, no matter how complex, can be represented with a single voltage source, and a single load. The question is, how do we determine the value of the TOTAL resistance when we have multiple resistors? This is the scope of this lesson. How do we mathematically combine resistances that are connected in series?

As I said before... it is as easy as 2+2. If two or more resistors are connected end to end, as in a chain, we say that they are in series. To find out the TOTAL RESISTANCE of resistors in series, all we have to do is add up their individual values. It is that simple. If we have 3 resistors, (R1, R2, and R3) each with a value of 2 Î©, the total resistance (RT) of the series circuit would be 2+2+2, or a total of 6 Î©. Hence, RT=R1+R2+R3+... is the formula for resistors combined in series.

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 …