Quote:
Originally Posted by Diabolical Artificer
Thanks both. Re zeners, or avalance type diodes, I wonder if a PTC thermistor or maybe an LED and LDR would serve to adjust for temp?
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How accurate do you need it to be? The tempco of Zener diodes is normally more than good enough for valve circuits. My guess is you are seeing the effects of the current-limiting resistor, not Zener variation.