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, called Kames Dandy, can mix signals from a wide range of frequencies and is...
June 2016 - It can be purchased from Mouser Electronics the new triacs Z04 for 4 A from...
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...