Visual dial indicator (CB9300E)

This circuit was obtained in a Popular Electronics of the 90s. The circuit can be assembled with equivalent components.

| Clique na imagem para ampliar |

Rain Alarm (CB12620E)
The sound produced by this circuit, from a 1978 publication, depends on the humidity between the...
555 Fixed Period Generator (CB25498E)
In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed...
High Speed Coupler Shield (CB6034E)
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operational....