Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

Push Pull with 1 Transistor (CB20055E)
Another circuit showing this configuration since there are others in this same section with...
Transistor Tester III (CB18919E)
This transistor tester circuit is a little more sophisticated than the previous two (CB18918E and...
Debouncer with the 7400 (CB22410E)
This circuit appears in several points of our site, including used in practical projects. The...