Logic level indicator 7400 (CB22407E)

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

Car Radio Converter (CB20249E)
This circuit was found in an American documentation. Its purpose is to modify the tuning range of a...
Automotive use PTC sensor (CB18981E)
This circuit was found in a Texas Instruments linear application manual from the 1990s. The...
3V to 5V Converter (CB4823E)
This circuit is from a Maxim manual and can be used to power shields from batteries. The circuit...