We found this circuit in a Popular Electronics from the 90's. The circuit uses three SCRs to trigger the loads.
The sensor in this circuit is a BA315 diode. Other diodes can be experimented, but this is one...
We find this circuit in 1975 documentation. The circuit can be used with other operational...
In the figure we have an application of an oscillator 4013 as voltage multiplier. It consists of a...