We found this CMOS circuit for excitation of a relay in an old documentation. The transistor is a general-purpose high voltage as used in the power supply.
This circuit triggers an LED when the voltage reaches the level set in R1. The circuit does not...
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
This stage of two complementary transistors was found in a 1977 Radio Handbook. Transistors admit current...