Metal detector (CB7888E)

This circuit was found in a 1970s RCA publication. Transistors support modern equivalent types. Observe the dimensions of the explorer coil.

| Clique na imagem para ampliar |

Sawtooth Generator (CB13021E)
The circuit shown in the figure uses a programmable unijunction transistor (PUT) of the BRY39 type...
Varicap tuning FM receiver (CB23551E)
This circuit was sent by reader and collaborator Adriano Muniz Moura from Pirapora – MG. The...
Incandescent lamp remote control (CB5271E)
This remote control for resistive loads using a triac appears elsewhere on this site. The circuit...