This sequential circuit of LEDs was found in a Popular Electronics from the 90s. The circuit can be programmed and an adaptation consists of using optical couplers to drive power loads.
The purpose of this circuit is to monitor the phase pulses of a logic circuit, checking if they...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...
This circuit for analog instruments was found in a Raytheon documentation from the 1960s....