Audio Engineering

Power Supply Design 151

Q1

C1 D1

R1

V in V out

Zener diode

0V 0V

470 uF

(a)

Figure 5.3 : Simple series regulators.

Q1(PNP)

V in V out

0V 0V

R2

R3

D1

R1

Q2

Zener diode

(b)

Q1

Q2

D1

V in V out

Zener diode

0V

C1

470 uF

R2

R1

(c)