Bass control (CB8722E)

Found in a 1993 Electronics Hobbyst Handbook, this passive circuit can be used with common preamplifiers and amplifiers.

Insect Repellent (CB12013E)
This circuit produces in the crystal phone or piezoelectric capsule the hum of an insect that...
Pink Noise Generator (CB13620E)
We found this circuit in a 1977 National Semiconductor audio manual. The integrated circuit is the...
AC Amplifier TL061 (CB14495E)
The circuit is from Motorola's Linear Databook from 1990, but the configuration is current because...