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.
This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120...
November 2016 - Mouser Electronics is making the new Kyocera MC2016K Series crystal oscillators...
This circuit is from an 80's documentation. The transistor can be any general purpose PNP and the...