Headphone amplifier (CB20653E)

The transistors used in this 1985 Radio Electronics circuit are for general use. The gain pot can be 220k or 470k and the input capacitor 22 uF.

Positive to negative voltage converter (CB20998E)
This circuit was found in old Maxim documentation. Check the availability of the IC if you are...
Amplifier for ceramic capsule (CB9059E)
Found in documentation from the 1980s, this amplifier uses an integrated circuit from the time....
100 W Inverter (CB13973E)
This circuit was found in the 1972 RCA Power Transistor Databook. Transistors can be replaced by...