This circuit was found in a 90's Electronic Design. The circuit can be adapted to use modern components. The power supply is made with 5 V which allows its use as a shield sensor.
May 2017 - Toshiba's new Bluetooth Low Energy Chip TC35678 for wireless applications can be...
Found on a 1965 Radio Electronics, this circuit fires a signal xenon lamp applied to the SCR from...
This circuit is from a 2005 Linear Technology manual. The circuit is powered by 3.3 V but can...