Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10 kHz or 100 Hz signals. The circuit drives a transducer and two LEDs.
In the figure we have a different configuration for an oscillator with the 555. This circuit was...
This circuit was found in a 303 Circuits issue of Elektor magazine from the 1990s. The circuit uses...
This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm...