This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.
This logic level indicator also indicates the presence of pulsating signals through a third LED. It...
Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a...
The TAA300 integrated circuit is not common today. In fact, the circuit shown is from a Dutch...