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Reply to "The new heater for Pearl thread II"

And THAT is why I throttled it back as much as I did.  It works, but is slightly luke-warm-ish.  Considering the time and components I need to make what I have perfect for me, buying this circuit actually saves me time and money.   Using this function generator I can much more easily set up a range of heat on demand by turning a knob.  Easy-Peasy.  It is very much like using a Coleman camp stove.  Start it on a low flame and then turn a knob to increase the flame to what you want.  It's kind of that easy, but instead of a valve creating more or less gas flow you have something that supplies little pulsed squirts of gas.  Run it faster and it squirts more gas and vice versa.

There are a few safety factors included, like a thermo switch that turns on a glow plug when the combustion chamber temp gets too low, a circuit breaker switch for when the combustion chamber temp gets too high and a circuit that keeps the combustion chamber fan running for a while after the heater is turned off to evacuate the chamber of any unburned fuel (although Dan's newer heater has a few more, like a circuit to watch for a flame in addition to combustion chamber temps - it's pretty sophisticated).  

Including a cabin climate control thermostat on mine has been pretty cool and it works great, it just needs a bit more heat output, but that was my own doing.  This new stuff will just be "Rev 01" of my (and Dan's) original work.  If it works, I can spec it out for other people with BN2 heaters with failing fuel pumps (see Danny's note of dead fuel pumps up above) and maybe resurrect a few more of them.  Without this approach you simply can not get BN2 fuel pump parts anymore.  

I, too, got my first Ham Radio license when I was ten and built my own transmitter, an Eico 720.  That was back in the days of vacuum tubes (1960).  In junior high ('64) Science Fair, I built a transistor logic demonstration using Dual J-K flip flops, the basic building block of digital computers (it's basically an electronically latching toggle switch).  Absolutely none of the judges understood what I was showing them.  

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