Just finished my latest build and sure I'll post up schematic but it's just the same ol' design with more modern devices.
Re soldering them down, piece of cake with a £30 hot air pencil from CH, simpler than soldering and cheaper than a decent iron, it's a technique that's simple to learn and just like we're not hand wiring valve bases anymore it's time to move forward and embrace modern technology, unlike regurgitating the same old designs, plenty of those around, eh!
I'm no spring chicken and knocking on the door of 60, sure I use a X4 magnifier that I hold in my eye socket and enables me to see whilst roasting the little buggers onto the PCB.
BTW I use 650V devices, 3 a side, maybe I'll try the 100V devices at some point.
Just a proof of concept BTW and no intention of selling anything, however I'd be happy to give some PCBs away with SMT parts fitted) so folk could have a play thermselves.
Heat wise, so far I've run the design at 40V and generating 140W @ 91% eff. After 1/2 hr the devices are 45-48C, no fan either, utterly amazing.
The cooling solution is rather simplistic (on purpose) and rather than having a milled slot to access and solder the heatsink to the underside of the devices, I've just used 8 vias under each fet to joint the top and bottom layes and use a 2mm thick copper strip bolted to the underside that then attaches to the heatsink. Crude but effective.
To generate 100W carrier (400W pep) is will need a 70V supply (35V carrier).
The new devices are fantastic and cheap too!
https://imgur.com/a/KAnhgOBhttps://imgur.com/f2ZWrDgStr.
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