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 time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
This oscillator circuit with the TLV2474 was obtained from a Texas Instruments Operational Amplifier...
This circuit is from a 1992 publication, but can be mounted very easily today. The circuit is...