Audio Engineering

310 Chapter 9

Figure 9.26 : Circuit oddments.

(a) DC bootstrap

R 1

Q 1

Output

0V

R 2

Input V

(b) JFET active load

Q 1

R 1

V

Output

(c) Amplified diode

R 1

Q 1

ve

RV1

(d) Offset cancelling emitter-follower

R 2

R 1

Input Output

0V

V

Q 1

NPN

Q 2

PNP