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captains log

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  1. The psu is 18.5v @ 6.5a as far as I remember...but is has this extra little wire connected which probably is some sort of sense wire??? not sure.. I am sure a Paul Hynes design would be a much better job though. Regards JC
  2. Just to clear a few things up. It is not a spoof...I really did this. Am I mad?...Oh YES.... Am I stupid?...Undoubtedly... I REALLY did saw the case of my Mac Mini POWER SUPPLY open. I tried to unclip it but could not. So out came the large Hacksaw...new blade at the ready and hey presto after a few hefty hackings the power supply case was off. Next up was the removal of the thin aluminium sheeting which was impeding the access to the delicate innards of the power supply. Out came the industrial sized sheet metal snips. These made extreeeeemly short work of the task. NOW the intimate innards were exposed....MMMmmmm. See the cheap capacitors glinting in the pale light reflected off my large, bald, misshapen head. Watch as they are removed with the white hot Weller number 22 chisel bit. I gleefully snort the acrid fumes arising from the blackened Pcb and the molten components nearby. I scurry in to the next room, my precioussssss Black Gate capacitors are stored here, away from the jealous green eyes of the poor ones. I carefully weld them into the mass of carbonised remains. The whole thing is levered into a new case, the wires are re-attached and the unit is plugged into the wall socket and the non-sawn open Mac Mini... The little rear button is caressed and it bursts into new life......My precioussssss is working, it sounds better....I am happy.... Gordon. Thanks for the info and tips on caps etc....I will be having a look around for other ones to try, now the whole thing thing is easily accessable I can do measurements etc..... The plugs I am not sure about though...I think they would be the same... For your info, there are 4 wires in the DC out cable.. +, -, screen and a very thin wire poss used for some sort of sensing, shutdown etc....
  3. Hi Gordon, The output voltage is 18v @ up to 6amps. The Blackgate was a BGN type. Regards JC
  4. Hello People.... Just done an upgrade on my Mac Mini PSU..... Had to saw the case open though!!!! THIS MODIFICATION WAS CARRIED OUT BY A QUALIFIED ELECTRONICS ENGINEER. DO NOT ATTEMPT THIS IF YOU KNOW NOT WHAT YOU DO. Changed the main high voltage capacitor to a BHC 220uf 450v, changed the 2 x 1500uf output smoothing caps to a 4700uf non-polar Blackgate. Added some EMI/RFI absorption sheets, added some acoustic absorption on the output lead, fitted a Furutech IEC inlet and built the whole thing into a much larger case. The Mac Mini has a separate hdd for storing my music ripped into .wav, optical spdif out into a highly modified Entech 205 dac... Much better soundstage depth and width, much better low level detail, top end is very smooth and detailed and less digital harshness. Bass is more tuneful. All in all a very worthwhile overall improvement....now I might have to get in the MM to see what I can do there!!!!
  5. Ok, I have ripped all my cd collection to my EXT USB HDD using EAC with Accurate Rip installed. I use an SB3 and an Entech 205.2 DAC. I have modded the DAC, better capacitors, regulators, diodes and power supply. The SB3 is virginal... (so far!!) I do not want to touch this yet. My question is.... can the path that the data takes thru the computer be optimised??? i.e. can better decoupling caps be used on the chips that shift all your audio data around?? does anyone know what this path is?? I know I don't!! Thanks in advance for any info..
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