Ground test (CB7278E)

This circuit tests the grounding of a three-pin outlet. We found it in a Popular Electronics from the 80s. The lamps are common neon type.

PUT and SCR Phase Control (CB4255E)
We found this load control circuit on the power grid using a SCR and PUT in a thyristor manual...
Xenonio Flash (CB4651E)
This circuit generates high voltage for the firing of a xenon lamp. We found this configuration in a 1994...
Adjustable power supply CA3140 (CB25232E)
The output current is of the order of 100 mA maximum, but the transistor used can be changed for...