HMS, thanx for the nfo.
I believe you are correct in your assumptions.
As far as the vic board being identical to the other resonant cavity control boards, they may have looked identical, but I wonder if all parts of the board were actually used?
Many of Stan's boards have wire bridges, etc., and I wonder if he only used part of the board in the steam resonator.
I do not think he used resonance in the steam setup, but I could be wrong.
Here's a hand-drawn diagram of the steam resonator circuit someone made on another forum - I found it here:
http://stansdream.com.ru/forum/index.php?PHPSESSID=6e0402099017ae0ee0717d8aa83348b0&topic=4.0Does it look like a polarity switching circuit to you?
As far as the picture from the home heating unit HMS, it could be a simple power supply transformer, supplying power for the unit.
I don't know - the wires and the transformer itself appear to be professionally made standard step-down xfmr to me.
Your guess is as good as mine.
But, if you look at the control board, you will see Stan used two transistors in pairs - NTE247(NPN) and NTE248(PNP), which are silicon complementary transistors.
He also used NPN and PNP pairs in the steam resonator vic we are discussing.
There is a common thread here, if we expand on it and follow it more closely, I believe.
I really want to get this working - It's cold here!
Plus, how many people could use a water heater that does not use tons of amps?
Something else I found interesting is the home heating unit board itself - it has the filename "WFCDRIVR.CKT" silkscreened on it.
If someone had access to this file, it would reveal a lot. I'm sure it was on one of the computers that was with the estate.
Also, on the control board, you will see the silkscreen says "24VAC".
The transformer appears to have 7 wires (that we can see).
HMS, your assumption of the coil having a secondary with bifilar chokes seems to be supported by the patent diagram.
Notice also the chokes (only) have a common core. In other parts of the patent, Stan states the coil is "together bifilar wrapped in equal length".
There is a mention of "resonant charging chokes".
Simple in concept, extremely complex in reality.