Found in a 1968 Motorola publication, this circuit generates a high-powered audio tone when triggered. Equivalent transistors can be used.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
August 2017 - Mouser Electronics is stocking the new Molex optical EMI shielding adapters. These...
This circuit can be used in alarms by activating a relay or a current load that depends on the...