Solar timer (CB20498E)

This very low consumption circuit can be powered by a solar cell. The time indication is given by a microammeter.

Germanium Transistor Voltage Regulator (CB987E)
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...
Oven control (CB7962E)
This sequential circuit with an optical coupler was found in a Popular Electronics from the 90s to...
Fuzz effect (CB17975E)
This guitar effect circuit was found in a 2002 documentation. The circuit can be powered by a 9 V...