dml wrote:Niiiiiice Always liked toroidal cores...
spiny wrote:looks good
and £50 isn't outlandish for a scratch built project PSU, it compares well to a PICO + power brick - I paid more for the PSU in my PC!
exxos wrote:dml wrote:Niiiiiice Always liked toroidal cores...
Me to I kinda got put off high voltage and switchmodes after working on repairing them for a few years
The transformer is a huge overkill really (60VA or 50VA) Though smaller ones are not much physically smaller and only like £1 cheaper. So just stuck with the "larger" ones. Something like 3amps on the 5V line pulls about 1amp on the toroid and its a 4amp transformer.
dml wrote:I really don't like high voltage switching supplies - mainly because they are used as a reference design for most of the cheap brick supplies, and they have really bad failure modes. They tend to kill themselves and whatever they are connected to. Heat gets them after just a couple of years and... -> bang. Made to be cheap, not to last.
I had a Fujitsu brick PC as a media player with one of those supplies and it randomly failed one day on startup. PC wouldn't turn on. After taking it apart, checking the RAM, battery clock etc.... decided to put a voltmeter on the brick.
230v instead of 19v. Nice, thanks very much. So everything went in the bin.
dml wrote:Someone may have asked already - but does this fit in a plain MegaST?
...ok I dug back and see the answer is 'maybe later'. I fancy one of these for my STE but would be interested too for MegaST+Falcon also if you go in that direction later.
anodyne wrote:I'm in Canada; is this just for UK/European voltages? What transformer specification should I look for if I want to source it locally?
spiny wrote:Just grabbed my Mega1 (not sure how different the Mega4 is) and took some pics.
The PSU appears to be the -exact- same model as one of my STes, just with a different baseplate.
NGF wrote:How hard is it to do the replacement, do you have to solder it in place or is it plug&play? I haven't actually looked how the old one is connected yet..
exxos wrote: Though as I am in the UK, this might not be viable for overseas people to start posting PSU's about.
DarkLord wrote:exxos wrote: Though as I am in the UK, this might not be viable for overseas people to start posting PSU's about.
Boy, did you just say a mouthful!
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