Schmitt Trigger 7400 (CB22419E)

This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a voltage of 5 V.

Signal Follower with Old Transistors (CB12922E)
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...
Photometer (CB19147E)
This sophisticated photometer that has a light comparator with LED indicator came out in an...
Fluorescent Lamps Test (CB18603E)
The presented circuit is used to test ordinary fluorescent lamps. This circuit also has a mains...