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Post by PinkFloyd on Oct 17, 2013 19:18:37 GMT
..... and an even better question, what did I buy it for? It was a few years ago now, and I remember posting about it here (on rockgrotto) but can't find the post, can't remember why I bought it and am not sure what it would come in handy for. I'll show you some pics and will then add some more description after the pics: What we have here is a 20VA toroidal transformer with a 9V-0V-9V AC output. Actual measurements (no load) are 9.88V-0V-9.88V AC (19.8VAC CT) This goes into the AC end of the board, straight into a LT611..... which I can only assume is a LT6110 ( cds.linear.com/docs/en/datasheet/6110f.pdf ) 62 x 150uF / 80V electroltyic capacitors, and 8 x 0.1uF film caps later the resultant DC output is 26.6V DC (or 13.3V-0V-13.3VDC) I honestly don't have a clue why I bought it! Any comments appreciated and if anybody wants to buy it please PM me...... I'm sure it would be SUPERB for a high end "Gigantus" PSU (regulators, ripple eaters, the works) but I can't see me ever using it.... it's absolute top quality both in parts and construction. Mike.
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Post by Deleted on Oct 18, 2013 22:32:54 GMT
Mike See if it's output is configured to give + and - supply rails. If it is, it looks like it would give around 4,700uF per rail , but very low ESR. Possibly used with some long forgotten amplifier in that case ? Personally, I think it is a mistake to connect a whole lot of the same value capacitors in parallel, as that would give a much deeper resonant frequency notch in the impedance, (much lower Z) and despite what the closed minded types may wish to believe, it does affect the tonal balance, JLH in his PSU add-on showed the resonant frequency of a 470uF that he measured as around 4,000Hz, although it was relatively flat from 3,000 to 6,000Hz. I got very neutral sounding results by paralleling a lot of different values. . e.g. 2,200, 1,000, 470 220, 100, 47, 10 uF,1uF Their resonant frequencies will all be different, and give a much smoother low ESR over a wider range of frequencies, but with a little ripple in the impedance over the range instead of a deeper notch. No, I haven't verified this with measurements..
Kind Regards Alex
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