This circuit was designed to power the previous circuits of the wireless sound system, but it can be used for other purposes. The circuit is from a Radio Electronics from August 1988.
Found in a 1967 US magazine this circuit generates positive and negative voltage pulses from a...
This audio mixer was found in an old American documentation. The potentiometers are 1M and the...
In this circuit of a 1968 publication the unijunction may be 2N2646 and the transistor BC548. The...