We found this circuit in a 90s Popular Electronics. The circuit uses a pickup coil that consists of 100 to 200 turns of wire 28 around the cable to be monitored.
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...