Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

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...