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.
This circuit was originally designed to drive an engine with a small flower that dances when the...
In the figure we have an RF amplifier for tunnel diode. The frequency range will depend on the...
Using two common operationals, such as 741, this circuit serves as a medium control in an...