This balance control for the channels of a stereo system was found in a 1969 Mullard documentation. The transistors may be the modern BC548 equivalents.
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...
This circuit can be used to drive relays, solenoids, motors and other loads according the...
This triac circuit was found in the July 1995 Electronics Now magazine. The triac is based on the...