We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can be a TIC106. The reset is done by a push button.
This single trigger circuit has been indicated for photography applications. The circuit is from a...
When the AC Power line fails, the transistors in this circuit are biased to conduce the current to...
This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The...