2. Construction, working principle of A.C. and D.C. ampere meter,
voltmeter.
3. Outline principle of transistor as an amplifier and oscillator
(common base/common emitter circuits). Calculation of voltage and
power gain for an amplifier.
4. Construction of audio amplifier.
5. Construction of oscillator.
6. Construction of Musical bell.
7. Construction of Simple emergency light.
8. Testing of musical bell, emergency light, amplifier and oscillator by
measuring voltages.
9. Construction of light operated switch.
10. Construction of sound operated switch.
11. Construction of touch operated switch.
12. Methods for fault finding of above devices and their verification.
13. Calculation of L,C,R & Z of a coil at light frequency using A.C.
voltmeter and ammeter.
14. PAS (Public Address System)-
15.
(a) Components of PAS and their specification.
(b) Demonstration – Installation
(c) Connectors used with microphones
(d) Impedance matching calculations for speaker.
(e) Locating and repairing of minor faults in PAS
Tuning circuit of TV, Transistor and Radio-variable, capacitor and
inductor. Idea of resonant frequency.
Class XI
1. Concept of block diagram – drawing simple block diagrams of
power
amplifiers
(audio),
radio, amplifiers, oscillators,
tape
recorder.
2. Integrated circuits fabrication – Advantages and limitations (I.C)
3. Feedback circuits – Classification of oscillator on the basis of feed
back.
4. To study the effect of positive and negative feedback on the
performance of an audio amplifier.
5. Assembling of 3-stage audio power amplifier.
6. Assembly of 3-stage I.C. based power amplifier.
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