This circuit is from a 1968 publication. Here we have several types of resistive sensors with individual adjustments triggering a single SCR. Power depends on the type of sound device to be triggered.
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...
June 2017 - Mouser Electronics already has the new Vishay DG series analog switches in stock. The...
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...