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Old 27th January 2005, 09:55 AM   #1
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Default Suitable PSU for OPA627+BUF

Hi ppl,
Built this circuit as a headphone amp, currently running it using 4x9v batteries and would like to convert it to AC power. Also should i have input caps?
My source is a iPod and cans are HD600s.
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Old 27th January 2005, 10:07 AM   #2
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The need for input caps has nothing to do with batteries or AC power supply. It's your signal source and I'll guess it's still iPod?
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Old 27th January 2005, 11:52 AM   #3
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Use a "in-wall" transformer, a brigde, a copule of E-lyt (2200-4700uF) and a set of LM317/Lm337 regulators and you are of.

Thomas
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Old 27th January 2005, 12:19 PM   #4
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You can't use a bridge with a normal/common AC wall-wart to get split rails of any real capacity. You must use a half-wave voltage doubler. See ESP project P05 for exactly what you need.
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Old 27th January 2005, 01:03 PM   #5
brianuk is offline brianuk  United Kingdom
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I agree with the Maplin line Rich

Oh yes and on topic! the P05, I use one and it'll do exactly what you need Shield. Funny though all the parts I got came from maplin, even some 47 Ohm resistors instead of 47K that I wanted
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Old 27th January 2005, 05:07 PM   #6
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Quote:
Originally posted by richie00boy
You can't use a bridge with a normal/common AC wall-wart to get split rails of any real capacity. You must use a half-wave voltage doubler. See ESP project P05 for exactly what you need.

You can use a DC Wall Wart and split the rails -- one of the ways is to use a power opamp to create an artificial ground, I can't find the schematic I posted about a year ago, but here is something similar from ESP:
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Old 27th January 2005, 07:48 PM   #7
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I knew somebody would post something like that It's more complicated though and still has a limited load that the artificial ground can cope with, but it should work OK for headphones.
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Old 27th January 2005, 10:04 PM   #8
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Quote:
Originally posted by richie00boy
I knew somebody would post something like that It's more complicated though and still has a limited load that the artificial ground can cope with, but it should work OK for headphones.
you can always use a Burr-Brown opamp on steroids.
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Old 27th January 2005, 10:29 PM   #9
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I used a BUF634 as ground driver with two 9V batteries and it was very good. I used it in class A mode to make sure it worked as a shunt regulator for all dynamic situations.

/Peter
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