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Noise Suppression for R/C Receivers


Noise Suppression for R/C Receivers
Receiver interference is hardly an unknown problem among model builders. Preventive measures in the form of ferrite beads fitted to servo cables are often seen in relatively large models and/or electrically driven models, to prevent the cables from acting as antennas and radiating interference to the receiver.
If miniature ferrite beads are used for this purpose, the connector must be first be taken apart, after which the lead must be threaded through the bead (perhaps making several turns around the core) and then soldered back onto the connector.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update
In the circuit diagram and on the PCB, pins 1 and 2 of connectors K9 through K16 have been transposed. The PCB may be modified to prevent reworking (ready-made) servo cables.
On the PCB, swap connections 1 and 4 of indictor L9. Disconnect the tracks to both pins, then solder a piece of light-duty wire between pin 1 of the inductor and pin 1 of K17. Next, solder a second piece of wire between inductor pin 4 and pin 2 of K17.
R1 = 1Ohm
C1 = 100nF
C2 = 22pF
L1-L8,L10 = ferrite inductor, SMD 1206 (e.g. Digikey # PMC1206-202-ND)
L9 = common-mode coil (e.g., Digikey # CM1011-254-ND)
K1-K8 = servo cable
K9-K17 = 3-way SIL pinheader
PCB, ref. 054018-1
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