Logic level indicator 7400 (CB22407E)

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

Traffic Light with Remote Control (CB17460E)
This circuit was found in a 1999 documentation, but it can still be easily assembled today, as the...
TV and Stereo Protection (CB16545E)
This circuit, found in a 1988 documentation consisting of an audio switch that turns off the load...
TLV854x Optimized Operational Amplifiers for Applications with Sensors (ART341E)
Launched in 2016 but with documentation reviewed in June 2017, the Texas Instruments TLV854x...