This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset current setting. The configuration can be adapted to operate with modern equivalent components.
We find this circuit in an American 80's documentation. No further information about the...
This conventional bistable power control circuit using triac was found in the June 1970 Radio...
This old voice circuit suitable for telephones of the time was found in a Radio Electronics from...