Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

| Clique na imagem para ampliar |

Mixer (CB20649E)
This version of a mixer with a transistor appears elsewhere in this section and on this website. The...
Christmas Tree Blinker (CB16903E)
This circuit, from a 1995 publication, powers incandescent lamps according to the power grid. The...
Submarine Microphone (CB21071E)
This circuit is intended for underwater communications. Of course, the critical point is the...