SMARIKA workeducation | Page 130

7.
Assembly of 3-stage tape recorder plate.
8.
Testing fault location and repair of above devices.
9.
Locating the fault in mechanical system of tape recorder and
rectification.
10.
To check the motor, change the belt, clean / change pinch-roller of
tape recorder.
11.
Check and change the head of tape recorder.
12.
Assembling dimmer using SCR.
i.
Working principle and circuit diagram.
ii.
To construct a dimmer.
13.
Assembling Electronic emergency lighti
.
Working principle and circuit
ii.
To construct emergency light
14.
Single phase transformer:
i.
Working
principle,
types,
materials
used,
connections
testing and specifications.
ii.
Construction of various types of transformers.
Class XII
1.
Manual voltage stabilizer – Working principle, circuit tracing,
connection and testing, repairing.
2.
Automatic voltage stabilizer- Working principle, circuit tracing,
connection and testing, repairing.
3.
Communication
–
Line-space
and
optical.
Outline
principle
including
type
of
transmitters,
receivers
and
communication
channel.
4.
Understanding of the principle, construction of twisted pair of
wires, coaxial cable wire, optical fibre.
5.
Designing of simple laser diode( Pencil beam / torch).
6.
Working of fax, modem- Connections, testing and repairing.
7.
Assembling the Transistor receivera
.
Description of circuit of transistor plate.
b.
Assembling the output stage.
c.
Assembling the I. F. stage.
d.
Assembling the mixer stage
e.
Alignment
8.
To locate faults in Transistor receiver circuit.
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