This timer circuit was found in a 1980s American documentation. Transistors and SCR support modern equivalents. The circuit was originally designed to control a motor.
This circuit was found in an Elektor from the 90s. Transistors are common and status indications are...
This circuit consists of an echo or reverberation chamber for sound systems and must be...
The transformer inf this circuit is a 6 or 9 V unit and diodes 1N4002. The filter capacitor is 2...