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.
Frequencies from 1 to 10 MHz can be obtained with a small adjustment of the variable in a narrow...
This flasher of two incandescent lamps was discovered in a 1983 documentation and it has two...
We found this trebble booster circuit in a 1990 documentation. The components are current, and the...