Bass control (CB8722E)

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

Unijunction Relaxation Oscillator (CB15625E)
This circuit can generate audio signals at frequencies ranging from 0.01 Hz to approximately 20...
FM transmitter (CB4473E)
This small FM transmitter has a sensitive modulating stage and is therefore suitable for listening...
Symmetric regulator from single source (CB5453E)
This circuit was obtained from old documentation using Intersil components. The circuit provides...