Logic level indicator 7400 (CB22407E)

In the figure we have a simple logic level indicator for TTL circuits or powered by 5 V.

Decade neon counter (CB6618E)
Found in a 1969 documentation, this neon lamp circuit may have the number of steps increased. The power...
Headlight Garage Opening (CB13380E)
The basic idea of this circuit is that, with a touch of the car headlight switch, the light...
Multiple Voltage Relay Activation (CB4155E)
This circuit allows selective relay actuation in the same line according to the applied voltage....