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Old 12th November 2008, 07:40 PM   #1
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Default Modifications suggestions for The Twisted Pear Power Supplies

The aim is to have the possible cleanest, smoothest, most "ironed" DC from The Twisted Pear Power Supplies, which would supply their Buffalo DAC. This the schematic diagram of their LCDPS: http://www.twistedpearaudio.com/imag..._schematic.jpg
And this the schematic diagram of their LCBPS:
http://www.twistedpearaudio.com/imag..._schematic.jpg .
Possibly most benefit will be by replacing capacitors, however, all suggestions are welcomed.
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Old 12th November 2008, 07:59 PM   #2
00940 is offline 00940  Belgium
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If it were me, I would probably change the caps at the input to +/-1000uF and replace the L-R filtering by a capacitance multiplier.

But honnestly, I wouldn't expect too big a change.
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Old 12th November 2008, 08:22 PM   #3
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Why donít you post an oscillogram of your supplies under load? Maybe there is an issue with your assembly or wiring, mine look very smooth. One thing I did, mostly a question of personal preference, was to use a 9V transformer for the LCDPS instead of 15V, reducing the value of the 10 ohm resistors to 6R2. It runs cooler but again, just personal preference.
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Old 12th November 2008, 09:08 PM   #4
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"If it were me, I would probably change the caps at the input to +/-1000uF and replace the L-R filtering by a capacitance multiplier."
Thanks.
What do you mean by "L-R filtering"?

"Why donít you post an oscillogram of your supplies under load?"
The PSUs are yet to be shipped and assembled.
Knowing how critical is the cleanliness of the DC supply in such circuits, I'd like to assemble them with the best possible configuration to begin with.
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Old 12th November 2008, 11:36 PM   #5
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I mean that you could jumper R2/R4 and instead of R1/R3, you connect a capacitance multiplier. http://www.acoustica.org.uk/t/3pin_reg_notes2.html

This for the lcds. For the lcbs, you'd jumper R2/R3.
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