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Assignment Active Circuits

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The section bellow contains an assignment for you to complete. This can be printed out for your own use.

A manufacturer of electronic switches has asked you to advise on the design of the transistor switching circuit shown in the figure. If the transistor has a common-emitter current gain of 200 and a nominal base-emitter voltage of 0.65 V, determine:

1. The value of collector current required to operate the relay
2. The value of base current required to operate the relay
3. The maximum value of the base resistor, R
4. The nearest suitable value of resistor for R taken from the E12 series
5. The power developed in the relay coil when the relay is operating
6. The input signal power when the relay coil is operating.

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