This audio tracker has good sensitivity and can be used in diagnostics of circuits that have audio steps. Q2 is a BD136 and the circuit can be supplied with voltages from 3 to 6 V. P1 works as a volume control.
This audio tracker has good sensitivity and can be used in diagnostics of circuits that have audio steps. Q2 is a BD136 and the circuit can be supplied with voltages from 3 to 6 V. P1 works as a volume control.