ANTENTOP- 01- 2020 # 024

Ferrite Clips and RF Current Sniffer

Figure 3 Schematic of the RF Current Sniffer with LED Indicator

Figure 4 Schematic of the RF Current Sniffer with Meter Indicator

Take a look to RF Current Sniffer with LED Indicator. On the ferrite clips wound three turns of the copper wire in 0.7-mm diameter (diameter of the wire does not matter, may be any suitable). Detector diode is 1N4148. This diode works up to 100- MHz. LED is unknown diode from a child toy (now it is widespread source for the LED).

This diode at 1.9-V consume 5- mA and provides very good brightness. Three 1N4148 diodes connected to the serial protect the LED from overvoltage and limited voltage across this one to 2.1-V. POT allows adjust brightness of the LED. Lower part of the ferrite clips is glued to the PCB by epoxy. Upper part of the clips allows connect the clips to coaxial cable. Figure 5 shows design of the RF Current Sniffer with LED Indicator.

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