Well it appears that the majority of filtering has been accomplished. The mystery remaining is what frequency does it operate and what are the intensity of the harmonics. The construction looks like it would be easy to attach an additional heat sink.
It is very rare to see a inverter on ePay that has a filament output. A nice find Bob.
Z

On 6/27/2025 12:03 PM, Robert Nickels wrote:

On 6/27/2025 9:12 AM, B. Smith via MRCA wrote:

what are you using to measure the Heat Sink temperature?

I just clipped a little K type thermocouple probe onto the heatsink. Not lab quality measurement, hi. I did aim the little IR thermometer at it and while the reflectivity is too high for reliable readings the screw holding the FET to the heatsink seemed to be a hot spot and it tracked pretty well wtih the TC.

The typical resellers of these things have no idea what they are so take any claims with a few grains of salt! As proof of that I offer this listing on Amazon for a much fancier supply with both HV and filament outputs:

https://www.amazon.com/dp/B0DZGR1HPR

When you see statements like " the general chassis of the gallbladder is a metal shell" - that's a clue to do your own homework ;-)
73, Bob W9RAN
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