This circuit was found in documentation from the 1980s. Transistors are general-purpose types like the BC548 for NPN and the BC558 for PNP.
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...