Reply 20 of 32, by BitWrangler
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- l33t++
rmay635703 wrote on 2022-03-14, 14:06:I’ve often thought a little universal kit should exist for converting/ upgrading linear motherboards to switched replacements
Time for BW's scary 3.something Volt strap proposal, get a bridge rectifier, snip off the inputs and put the negative output to 5V and positive output to 3.3V pin. That gives you two diodes in series dropping 1.4V from the 5V line, in a parallel pair, so it does 2x as much current as rated.... but most of the time it will end up 0.1 to 0.3 higher than regulated so it will tend to blow up first, closely followed by the regulator.... so you'd only wanna do that if you fiddled the 5V down to 4.8 and vreg output was 3.5, so it would come in to relieve the regulator when the voltage started to droop. Orrr, if you got a 5A rated bridge regulator to do it with, so it was basically getting all the amps through that. However, depending on 5V fluctuations your core voltage would be a bit random between 3.4 and 3.8V. It's dissipating all the extra too so gotta sink it. This idea sponsored by the committee for abuse of vintage hardware, it's kind of a "don't do this unless you know what you're doing, but if you know what you're doing you've probably got a saner idea."
Though as I think I said to someone else tryna put excessive CPU in a socket 5.... First look up the part number of your linear regulator and order 10 spares....
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.