Tone Oscillator (CB22066E)

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

Drip Irrigation Robot (CB18087E)
The presented project is simple, but efficient in medium distance irrigation. In this circuit, the time...
10 W Amplifier (CB6158E)
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
Triac Thermostat (CB26129E)
We found this circuit in the 1989 Radio Electronics Experimenter. The circuit uses common...