Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5 mA of current for HeNe laser.
This circuit triggers a photographic flash when the microphone picks up a sound. The SCR can be...
We found this circuit in an old English documentation from the 70s. The transistor can be a modern...
Found in old English documentation, this circuit simulates a diac and can be used to trigger...