Tone Oscillator (CB22066E)

Found in old documentation, this oscillator with the LM380 produces an audio tone in a speaker. Frequency is set in VR1.

Optical Link (CB16008E)
Data from a serial output can be transferred to a remote serial input via an optical link via...
Simple Analog Tachometer (CB13969E)
This circuit, which uses germanium transistors, is from a 1965 English magazine. The used...
Automatic fader (CB8432E)
This fader or fader was found in a 90s Popular Electronics. The circuit uses transistors that are...