This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time, but the circuit can be adapted to use modern components and act as a shield.
We found this traditional configuration in an Italian 1960 documentation. The transistor can be...
This detector was found in an old Electronic Design using transistors of the time. The circuit can be...
This circuit can source up to 1,000 V from a 9 V battery. Output current is very low, some...