On Sat, 9 Jan 2010 17:12:57 -0600, Ward Silver wrote:
>the next step will likely be adding ferrite corres to the controller
Remember to wind enough turns through the cores to move their
resonance down to the frequency range that excites the problem.
Some other thoughts.
Consider the current path of the relay as an RX antenna (or magnetic
loop). If possible, rewire it with twisted pair, so that the signal
return is twisted with the hot lead. Doesn't matter for DC, but it
sure does for RF. You don't need to break the other return path -- RF
will follow the path of least impedance (inductance), which is the
If there is some sort of high-Z sensing circuit that drives the
controller, try a bypass cap across it.
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