This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by BC548. The relay must have 100 mA of maximum current.
This ultra-low consumption circuit oscillates at extremely low frequencies that can be adjusted in the...
This circuit is from 1994 documentation by National Semiconductor. What it does is convert the...
Other series comparators such as the LM239 and LM339 can be used in this oscillator circuit. The...