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.

Neon Insulation Test (CB11534E)
This useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
Automotive use PTC sensor (CB18981E)
This circuit was found in a Texas Instruments linear application manual from the 1990s. The...
SSB Side Band Selector (CB4110E)
With this circuit it is possible to select the upper or lower side band on an SSB transmission by...