This wide range timer was found in the July 1994 issue of Electronics Now magazine. The circuit drives a relay and is powered by the relay voltage.
September 2016 - It can be purchased from Mouser Electornics the iW1818 of Dialog Semiconductor, a...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...