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castlesteve With that high wattage resistor (alum with heat sinks), you will be sinking a lot of current through those wires!! ... and you are forcing the diodes to sink more current than they may take.
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The resistor does get hot, I had it on a soak test for about 2 hours. This may be a benefit, a voltage regulator. But wouldn't the voltage regulator get just as hot as the resistor?
At present, the whole set up draws about 130 mA of current. I'm no electronics expert, but is this excessive?