Expert advice

Radio noise suppression of the Dymond D47 servo

Dymond D47

The Dymond D47 servo is excellent but has poor RFI suppression.

When the servo is placed very close to the Icare2 transmitter it sometimes moves slightly when transmitting the position.

In fact, the servo wires act like an antenna and inject the Icare2’s signal into the servo.

To remedy this problem, simply place a filter on each of the 3 wires of the servo, as close as possible to the servo.

We recommend MURATA BLM21PG221SN1D ferrite beads. Their dimension is 2 x 1.25 x 0.85 mm.

They can be purchased from Digikey (ref 490-1054-6-ND) or Farnell.


Soudure des ferrites

Cut the 3 wires of the servo, as close to the servo as possible.

Insert a piece of heat-shrink tubing on each of the wires.

Solder a ferrite bead to each wire. The ferrite bead can be soldered in any direction.

Mise sous gaine thermoretractable

Move the heat-shrink tubing over the ferrite beads and heat the tubing.

That’s it!

Servo movement should be almost non-existent.