This circuit activates a buzzer when the voltage applied to the input falls below a preset value in R1. The circuit is from an 80's American documentation.
This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
This circuit is used to test capacitors with a working voltage above 150 V, detecting shorts or...