When the voltage in the circuit exceeds the value set in the trimpot, the LED goes off and, if a low current buzzer is used, it rings. The circuit is from American documentation from 1999.
This circuit was presented in a January 1990 Radio Electronics magazine article as part of a home...
The circuit shown is for testing both signal diodes (low current) and rectifiers (high current). The...
Found in 90s American documentation, this circuit generates an alternating voltage of 120 V x 150...