This old circuit, from the 80s, was found in American documentation. The circuit uses dual gate FETs (MOSFETs) and has no data on the coils used.
When the input voltage is higher than 2/3 of the power supply voltage the green LEDs glows. When...
This is a conventional alarm that uses NO and NC type sensors for doors and windows. The circuit is...
This circuit was obtained in a 1972 RCA power transistors manual. The transistor admits...