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Old 31st January 2008, 05:30 PM   #1
sith is offline sith  Croatia
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Default low voltage PSU for Pedja Rogic's buffer

Hello ppl, I'm planning to build Pedja Rogic's J-fet buffer like he did on his site or Nuuk on Decibel dungeon, still, I'm running to a bit of a problem, I want to use a separate PSU to feed it, I have +/-12V transformer, but I have problems with its realization - is it enough to make 'part 2' PSU from nuuk's site right after rectifier or I need to put some smoothing caps in front of it, although Pedja himself told me that for this circuit anything over 1000u is overkill...

Part 2 PSU in attachment
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Old 31st January 2008, 06:19 PM   #2
Nordic is offline Nordic  South Africa
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I ran mine with 2 x 2200uf per rail, unregulated.... very good sound nevertheless, even at the 17 odd volts I was pushing mine too...
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Old 1st February 2008, 06:51 AM   #3
sith is offline sith  Croatia
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that's nice, still it doesn't answer my question
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Old 1st February 2008, 08:35 AM   #4
Nuuk is offline Nuuk  United Kingdom
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Well that 12 volt traffo will give you between 16-17 volts assuming your mains supply does vary too much.

Pedja actually used an LM7815 reg on the same board as the buffer to keep it as compact as he could. However, the LM7815 would require around 18 volts in to give 15 out. You could try using an LM1084 that only has a 1 volt drop out, or go with a slightly larger tranformer.
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Old 1st February 2008, 10:33 AM   #5
Nordic is offline Nordic  South Africa
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which is why I left the regulator away... Sure there is some benefit to gain from regulation but it sounded pretty good even without.
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Old 1st February 2008, 06:19 PM   #6
sith is offline sith  Croatia
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Ye, I know it need some voltage swing (79xx), still, Pedja himself said that 'darlington' version is better than LM version... well nwm, I think I'll try LM version... Something like one in Nordic post over at SS forum (buffer for dummies), or Rod Elliots, project05, only with smaller snubber cap?
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