Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is emitting signals. The sensor is a general-purpose type found in many electronic devices.
This circuit is from a 1982 publication. It is a sequential effect of accelerated LEDs. The...
This circuit was obtained from an Electronic Design from 1964. The components used are from the...
This circuit reinforces the treble, working as a booster for instruments or home theater. The...