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Amateur Extra · FCC ELEMENT 4

E7D06

Amateur Extra · FCC Element 4 · answer reveals automatically

EXTRAE7 · Practical Circuits
E7D06

What is the purpose of Q1 in the circuit shown in Figure E7-2?

Figure for E7D06
AnswerIt controls the current to keep the output voltage constant

In Figure E7-2, Q1 acts as the control element whose current is varied to regulate the output voltage.