The frequency of this circuit can be varied from zero. The circuit uses the CMOS 4046 and was found in the November 1984 issue of Radio Electronics magazine. The base frequency is given by C1.
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...