I use a comparator circuit as well.
With a couple of very large capacitors in the rectifier circuit and an
isolating cap on the trigger voltage feedback circuit, the comparator takes
as much as 40 seconds to trigger off at a dead short below the trigger
voltage.
No static spike is not going to get absorbed from the power supply end
and the water damps out static on the business end.
Like Trem says..bulletproof.
PS I don't use mosfets etc [TTL , I believe..virtually immune to
spikes blowing them out]
Ode
It's not a problem. The units are not triggered by static electricity
unless one touches one of the electrodes when it is in open air and even
then it is difficult to trigger. It requires a certain amount of
resistance between electrodes to trigger. The generator circuit measures
voltage drop across the resistance and compares it to the dial setting
voltage. When they are the same the unit shuts off.
> It should be possible to see if this is the problem by starting a
> batch and turning on an ordinary electric drill nearby. If the
> system shuts down immediately, suspect rfi getting into the
> comparator.
Doesn't do a thing. As stated above. Nothing shuts it down except the
resistance in the water or the use of an external resistor for calibration
purposes. Pretty much bulletproof in operation.
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