This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
The sensor for this circuit, found in a 1968 magazine is a common LDR. The diode is for general use...
This circuit was obtained from Motorola documentation from 1969. The setting applies to other...
This circuit is from 1968 and consists of an amplifier for turntable of the time. The CA3020 was...