This circuit was found in an American documentation from 1968. The circuit generates ladder-shaped signals adjusted in a potentiometer. Equivalent transistors can be used.
This circuit generates output pulses with sequential delays. The delays can be programmed by the...
This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used...
This is an audio amplifier typical of an old tape recorder. The circuit is from a Radio...