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Old 15th May 2009, 02:39 PM   #1
figge77 is offline figge77  Sweden
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Default how to build a regulated psu to drive an op-amp?

hi!

i am doing some modifications to an old cd player and want to build a powersupply for the op-amp. the dac i already done this for. but that was somewhat easier. it just needs 5vdc. but as i can see the op uses somewhere between 4,5-24V pos and neg

i have tried to build a regulated psu for this but i failed twice.

i have ample supply of 78xx and 79xx regulators but i seem to be missing something important,

can someone point me in the right direction? is there any good schematics somewhere?

the transformer i will use is a 2x15V

i have powered the op with 12battery and it worked fine. sounded pretty good. but not very practical

cheers
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Old 15th May 2009, 02:47 PM   #2
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I would probably go with one of the low noise super-regs
such as a Jung, Per-Anders or check these threads
The simplistic Salas low voltage shunt regulator

Best low noise regulator?
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Old 15th May 2009, 02:54 PM   #3
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Default Re: how to build a regulated psu to drive an op-amp?

Quote:
Originally posted by figge77
is there any good schematics somewhere?

Yes - the datasheet:
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Old 15th May 2009, 03:08 PM   #4
AndrewT is online now AndrewT  Scotland
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for a +-5Vdc regulated supply you should be using a 6+6Vac to 9+9Vac transformer, not 15+15Vac transformer.

If you pre-regulate down to ~10V and fit big heatsinks you can use your high voltage transformer but that's a lot of extra hardware that can be avoided by buying the correct transformer.
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regards Andrew T.
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Old 15th May 2009, 04:37 PM   #5
figge77 is offline figge77  Sweden
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Quote:
Originally posted by AndrewT
for a +-5Vdc regulated supply you should be using a 6+6Vac to 9+9Vac transformer, not 15+15Vac transformer.

in this psu i was aiming att maybe 12-15VDC to the op.

MJL21193: thank you! is it good for the purpose?
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Old 15th May 2009, 05:42 PM   #6
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Quote:
Originally posted by figge77

is it good for the purpose?

Absolutely.
Here's something more complete:
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Old 15th May 2009, 05:48 PM   #7
Sheldon is offline Sheldon  United States
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Or if you want a bipolar shunt reg: http://www.diyaudio.com/forums/showt...12#post1349112

Component values for 39V output and pcb files later in the same thread. Change the zener reference and a couple of resistors for lower voltages.

Sheldon
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Old 19th May 2009, 10:47 PM   #8
figge77 is offline figge77  Sweden
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thanks for all the advice.

i managed to get it to work. i used the schematic posted by MJL21193
and some of my own touch. works like a charm. sounds probably as good as a op-amp sounds


maybe offtopic but would there be any way to build a SS outputstage instead of the op amp?
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