a Telephone dialer (CB10147E)

This circuit was found in an 80s documentation. The integrated circuit used is from that time, being a component that is difficult to obtain today.

| Clique na imagem para ampliar |

Negative Voltage Generator with the 555 (CB12324E)
This configuration can be found in other articles on this site. This was obtained in 1998...
Noise Generator (CB5432E)
This circuit generates both white and pink noise. The transistors can be BC548 and the power...
Solid state relay (CB8395E)
Found in 90s Radio Electronics, this shield can control high voltage loads in the power grid....