### Measurement of the unknown capacitance schering bridge method.

Aim:- Measurement of the unknown capacitance schering bridge method.
Apparatus:- Sharing bridge kit
digital multimeter,
patch cords,
Circuit Diagram:-
Theory:-
The schering bridge one of the most important ac bridge is used the extensively for the
measurement of capacitors.
In the schering bridge the arm 1 now contains a parallel combination of the
resistor and the capacitor and standard arm contain only one capacitor. The standard
capacitor is usually a standard high quality mica capacitor.
in the balance condition of the bridge the sum of the phase angles of the arms 1
and 4 is equal the sum of the phase angle of arms 2 and 3.at the balance in condition there
is no current flow in the galvanometer.
The balance equation is derived in the usual manner, and by substituting the
corresponding impendence and the admittance the value of the unknown capacitor and
the resister is find as given below.
Cx=C3(R1/R2).
Rx=R2(C1/C2)
Procedure: -
1) Study the circuit provided on the front panel on the kit.
2) Connect the unknown capacitance of the position given.
3) Set the null point of galvanometer by adjusting the variable
4) Calculate the value of unknown capacitance by formula given
Result: -The values of unknown capacitance is measured by shearing bridge
Viva Questions-
1)What is the Q factor of the coil?
2) Which bridges are used for measurement of inductance
3) What is the range of Q?
Experiment no-8
Aim-. Measurement of the 3phase power by the one watt meter method.
Apparatus:-
Wattmeter (0-5A)-, 300v-1no
Ammeter (0-10A)-1no
Voltmeter (0-600v) , (0-300v)-1no
Three phase variance.
Circuit Diagram:-
Theory:-
In this method the total power is consumed is calculated by using the one wattmeter .
This method is used only if the load is balanced The ammeter is connected in between the
coil to the same size and line. The other terminal is connected by the two lines. In this
method the wattmeter is first connected with the R phase and then the B phase The rating
of these two conditions are summed by the total power consumed
Here-V1=V2=V3=V
& I1=I2=I3=Iline
&V13-V12=V23=Ă–3V
Reading of wattmeter when connected to phase R
P1=V12*Il*(30-A)
P1=VIĂ–3cos(30-A)
Reading of wattmeter when connected to phase B
P2=V12IL(30+A)
P2=Ă–3Vicos(30+A)
Sum of two conditions
P=P1+P2
P=Ă–3Vi{cos(30-A+cos(30+A)}
P=3VicosA
This equation gives total power consumed by load.
Observation Table:-
Sr no Voltage Current Power 3 phase watt
Procedure:-
1) Make the arrangement as per the circuit diagram.
3) Note the corresponding values of voltmeter ,ammeter and wattmeter.
Result:- Hence in that way calculated the 3phase Power by one watt meter method.
Viva Questions:-
1) Explain the short how the wattmeter is connected in the circuit to .
Measure the power delivered to the Load and the Line.
2) Explain How the Resistive Power is measured by the Wattmeter
Method

### 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 …