This dual-tuned 60 Hz oscillator was found in the Radio Experimenter Special projects of 1993. The circuit has the timing ranges given by C1 which can be changed.
This circuit is powered by only 3 V and can flash white LEDs from 3.2 to 3.6 V, as it includes a voltage...
This control circuit for direct current motors uses a 741 and an operational one of unusual power...
This circuit is from an English documentation from 1968 but can be assembled with modern...