This circuit was found in volume 5 of the 1995 Encyclopedia of Electronic Circuits. The circuit is based on delayed triggering of SCRs that control a DC load.
Found in old English documentation this circuit can be made with a BF245 or equivalent. Coils are...
This circuit is indicated for the generation of signals in the 40 meters range. The circuit was...
Carbon microphones are no longer used in most projects. However, finding one in the scrap metal, it...