Chess game timer (CB7084E)

This RCA circuit provides timing intervals from 5 to 120 seconds. The components are of the time, but they admit modern equivalents.

| Clique na imagem para ampliar |

Light Alarm (CB10330E)
This circuit was obtained in a 1985s English magazine. The circuit can still be assembled with...
Optical communication transmitter (CB7849E)
This circuit was found in a 90s American documentation. The circuit uses an LED that can be of a...
Compensation Integrator (CB14107E)
The circuit presented is from the National Semiconductor's Linear Applications Handbook of 1994. We...