Logic level indicator 7400 (CB22407E)

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

5 V x 3 A Regulator (CB19128E)
The power transistor of this circuit can also be the TIP42 mounted on a good heat sink. The...
Limit alarm (CB9582E)
Using a window comparator, this circuit trips over a certain range of input voltages. Formulas for...
Time Control Timer (CB4964E)
This timer circuit was found in a 1980s documentation. The integrated circuit is the 555, which...