This detector with ultra-low deviation was found in an American documentation from the 90s. Operational amplifiers are from that time. The power supply must be symmetrical.
This circuit deactivates devices powered by the power grid so that when the power returns, they do...
We found this circuit in a 1998 publication. It drives an incandescent lamp for a time that...
This tachometer from a 1994 publication has a bargraph scale with the well-known LM3914 integrated...