Indicated for adjustment in transmitters for the 11-meter band, this circuit with analog meter was found in the Radio Electronics magazine of January 1978. The circuit does not use a power supply.
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...
This ultrasonic insect repellent was found in American documentation from the 1980s. The...
Oscillators up to some megaherts can be made with comparators like the LM139, 239 or 339. Theses...