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 |

DC Millivoltmeter (CB8213E)
This circuit was obtained from a 90s Radio Electronics. The value of R1 determines the scale...
Bicolor LED VU LM3914 (CB16650E)
This circuit is from 1992 documentation, but it can still be assembled today, as the components used are...
Low Voltage Peak Detector MC34071 (CB14486E)
This circuit is from the Motorola Linear Databook of 1990. The values of the components depend on the...