Logic level indicator 7400 (CB22407E)

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

Momentary indicator (CB22125E)
When this circuit is activated the LED flashes for a moment indicating that the function has been...
LED bargraph with LM3914 (CB11842E)
This is the basic configuration for using a moving bar indicator or bargraph using the LM3914...
Signal Tracer (CB22015E)
This circuit was found in old documentation. Transistors can be general purpose JFET types and the...