SEMI-CONDUCTOR DEVICES: CHARACTERISTICS & TESTING METHODS:

Objective of this experiment:
1. To investigate the characteristics of typical germanium and silicon semiconductor diodes, plotting voltage - current curves and find out the knee of the curve in each case.
2. To find that there is no linearity below the knee and there is linearity above the knee.
3. To find that the forward bias voltage across the germanium diode is around 0.3 V and that of the silicon diode is about 0.6 V to 0.7 Volts.
4. To observe that the forward voltage varies in proportion to the forward current, although not very significant.
5. To measure the leakage currents in these diodes by reverse biasing, although they are not very significant.
6. To test diodes with an ohmmeter.

NO POWER SUPPLY IS REQUIRED, since it is constructed out of passive components.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. To draw the characteristics of a zener diode and to investigate its application as a voltage regulator, and determine the range over which the zener diode maintains a constant output voltage.
2. To use zener diode, in a voltage regulator circuit.
3. To demonstrate the ability of the circuit to compensate for input voltage and load variations.
4. To see how the zener diode performs with forward and reverse bias conditions.
5. To calculate the power rating of the zener diode suitable for required load currents.

Built in regulated power supply: + 15V/300mA, -15 V/300mA Input Supply: 230 VAC/50Hz mains operated. Dimension: 27cms x 17cms x 10cms. Weight: 500gms

Objective of this experiment:
1. To determine the current gain (alpha) of a common-base transistor.
2. To determine alpha cutoff frequency.
3. To measure IBC collector- Base current.
4. To determine the current gain (beta) of a common emitter transistor.
5. To determine beta cutoff resistance of a common-collector transistor circuit.
6. To determine alpha, when beta is known and vice-versa.
7. This trainer has got common base, common collector & common emitter configuration of both NPN & PNP transistor.

Built in regulated power supply: + 15V/300mA, -15 V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. 1. To demonstrate the operation of a field effect Transistor (FET) characteristic and testing methods.
2. To examine the relationship between the gate-to-source voltage (VGS), and drain current (ID) and the drain-to-source voltage (VDS) in an N-channel junction FET.
3. To measure and record the corresponding VGS, ID and VDS values and then plot these values to form a set of drain characteristic curves.
4. To complete the experiment by using these curves to determine the trans-conductance of the FET.

Built in regulated power supply: + 15V/300mA, -15 V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To demonstrate the operation of a typical insulated gate FET. You will examine the relationship between the gate-to source voltage(VGS)the gate drain current (ID) and the drain-to-source voltage (VDS)in a N-channel, depletion mode IGFET. You will measure the corresponding VGS, ID and VDS values and graphically plot them to form a set of drain characteristic values.

Built in regulated power supply: +15V/300mA, -1 5V/300mA.
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

POWER ELECTRONICS

Objective of this experiment:
To test the varactor diode by applying reverse voltage and how the corresponding change in capacitance across PN junction. To draw the graph between applied reverse voltage (V) versus capacitance CT.

Built in regulated supply + 15V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To demonstrate the operation of a typical uni-junction transistor and show a practical application of the device. You will determine the peak voltage (VP) and valley voltage (VV) and construct relaxation oscillator.

Built in regulated supply + 15V/300mA.
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To verify that the SCR is basically a rectifier which conducts current in only one direction. However, the device can be made to conduct (turn "ON") or stop conducting (turn "OFF") and therefore provide a switching action that can be used to control electrical current. To draw the V-1 characteristics by taking different readings of anode voltage and anode current to get the forward break over (VF) and holding current (IH).

Built in regulated supply + 15V/300mA.
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. To study the firing angle of SCR during positive & negative half cycle.
2. Two SCRs are connected in opposite directions & anti-parallel, are used to control the phase.

Built in power supply: 30V AC
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. To control the speed of the AC motor, hand driller, etc, using SCR.
2. The gate is triggered by diac device to control the speed of motor.
3. The SCR conducts in one direction when it is triggered by a positive voltage applied between gate & cathode. The trainer is operated with 230VAC/50 Hz mains.

Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. To construct time delay circuit using SCR triggered by UJT. To build relaxation oscillator using UJT and the timing can be varied by different capacitors and potentiometer. The pulses generated by UJT should be given to gate for triggering. The SCR can be turned ON with reference to the input pulses.

Built in regulated, power supply: + 15V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To construct single-phase half & fully controlled bridge rectifier. Two SCRs are used in two arms of the bridge. During positive half cycle the firing angle of SCR1 can be controlled and observed. During negative half cycle the firing angle of SCR2 can be controlled and observed on CRO. Similarly both positive & negative half cycles of applied AC signal can be rectified.

Built in power supply: 0-18V AC/50Hz
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
1. To observe the forward & reverse V-I characteristics of Triac and plot the graph.
2. To observe the forward & reverse V-I characteristics of Diac & plot the graph.
3. To observe the break over voltages of Diac & Triac.



Built in regulated power supply: +15V/300mA, -15V/300mA, + (0- 35)V/300mA; -(0-35)V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms

Objective of this experiment:
To construct Lamp dimmer using Diac & Triac. To build Lamp control circuit using Triac. The gate of the triac is triggered by diac (bi-directional device). The firing angle can be varied by the gate control simultaneously the brightness of the lamp can be varied.

Built in power supply: 130 VAC/50Hz
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms