This oscillator uses a crystal to set the frequency. The operating limit of the unijunction is in the order of 100 kHz. Power supply can be between 10 and 20V.
This simple circuit was found in a 1981 publication. As readers can see, we have an H switch and...
This circuit is from 2001 documentation with the purpose of controlling a pump that fills a water...
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...