Slave flash (CB8700E)

This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR not common today.

Electronic Compass (CB25382E)
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...
DC to AC Power Inverter (CB19919E)
The MOSFETs are of the type of power and the resistors have their values between 1 k and 10 k for...
Increasing zener voltage with LED (CB22134E)
In the figure we have the way to use an LED to increase the voltage of a zener. The increase...