Quote:
Originally Posted by PJL
And they all generate RF interference
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Not all. Two ways around this I have found.(Trying to shield & filter them never works 100%)
One is to make it a sinewave converter.
The other, if square waves are used, is to keep the fundamental frequency very low, around 50Hz and tune the transformer primary and control the transistor saturation so it is not too heavy. Have a look at the scope recording at the last page of this article:
http://www.worldphaco.com/uploads/WORLDFETRON.pdf
This DC-DC converter ( Called the Omega Device) generates no detectable RFI over 100Khz. It had to be like this because it was for a radio nearby.
Luckily for the OP's GDO, RFI won't be a problem most likely.