The circuit shown is from the 1977 GE semiconductor manual. More modern equivalent SCRs can be used. R1 must be wire type.
This circuit can generate signals of frequencies up to 1 or 2 MHz, tuned in the capacitor. The...
This is a simple voltage tester for voltages from about 2V to about 15V with the indicated...
We found this simple undervoltage indicator circuit in a 1992 publication. The circuit triggers an LED...