Found in the July 1970 Radio Electronics magazine, this circuit has an adjustable activation time that depends on capacitor C1. The SCR may be a 106 series equivalent.
This stabilized power supply was found in the 1974 Ferranti transistor manual. The power...
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...