@budgiebin@snouts.online I was about to ask for measurements; I was able to find a part number in the service manual (the power plug is not proprietary, it's an HEC2305-01-030) but I couldn't find any actual datasheet for that
But if you want to modify it putting a new power plug in would probably be easy
Don't expect it to be all that energy efficient! it doesn't seem to be designed to run on batteries
@budgiebin@snouts.online oh I see the problem, it uses a center-negative input, which is opposite polarity from most of these things. The ones you plugged into it might have been center-positive supplies, which are more common by far (you can convert one by just cutting the wire and swapping them though)
@Motodrachen @budgiebin@snouts.online Oh, are you the one doing the modification?
@Motodrachen @budgiebin@snouts.online Huh. With the input protection circuitry damaged I'd worry that something else broke due to the input protection not working--unless you mean it was stopping any power from getting to the rest of the board.
@Motodrachen @budgiebin@snouts.online that's not too uncommon, especially if it's an old one--a lot of older wall warts are unregulated and output something above their rated voltage with no load on them
@Motodrachen @budgiebin@snouts.online I dunno, it's not exactly a recent thing is it? modern electronics can be sensitive to that but older ones tended to be more tolerant of weird power supplies
@Motodrachen @budgiebin@snouts.online I haven't analyzed the circuit completely but chances are it's a super generic bjt that you could replace with a 2n3904 or 2n3906 depending on whether it's pnp or npn (it might need more current than that though, I don't know, maybe a tip31 or tip32)
@Motodrachen @budgiebin@snouts.online I imagine it doesn't depend too strongly on β but do try to get one with a fairly significant β
@Motodrachen @budgiebin@snouts.online I'm sure you know what you're doing though, I just find this really neat!
@Motodrachen @budgiebin@snouts.online Are you familiar with the little switching power supply modules you can get from like CUI and Recom and stuff? one of these https://www.digikey.com/product-detail/en/recom-power/R-629.0P/945-1604-5-ND/2303008 and a four-cell li-ion pack might be a good idea, or you could poke around for a boost converter one and use a single cell
@Motodrachen @budgiebin@snouts.online they're super handy! all one package, no pesky external inductor and sensitive PCB design needed, point-to-point friendly
@Motodrachen @budgiebin@snouts.online see the problem with switching converters though is that the exact shape of the traces on the PCB can cause them to just not work at all, they're really sensitive to that and we've never managed to use one without blowing several MOSFETs on early board revisions
@Motodrachen @budgiebin@snouts.online yep! fun stuff. You should see the analog frontends on some high-frequency oscilloscopes or spectrum analyzers sometime--they have weird little squiggles and bits sticking off at odd angles and traces going to nowhere, all of it carefully designed to act as inductors and capacitors and take advantage of Weird Transmission Line Effects™