how to build a regulated psu to drive an op-amp?

figge77 · 15th May 2009, 02:39 PM

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

coloradosound · 15th May 2009, 02:47 PM

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?

MJL21193 · 15th May 2009, 02:54 PM

Quote:

Originally posted by figge77
is there any good schematics somewhere?

Yes - the datasheet:

AndrewT · 15th May 2009, 03:08 PM

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.

figge77 · 15th May 2009, 04:37 PM

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?

MJL21193 · 15th May 2009, 05:42 PM

Quote:

Originally posted by figge77

is it good for the purpose?

Absolutely.
Here's something more complete:

Sheldon · 15th May 2009, 05:48 PM

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

figge77 · 19th May 2009, 10:47 PM

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?

15th May 2009, 02:39 PM	#1
figge77 diyAudio Member Join Date: Apr 2009	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

15th May 2009, 03:08 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

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15th May 2009, 02:47 PM	#2
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	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?

15th May 2009, 05:48 PM	#7
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	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

19th May 2009, 10:47 PM	#8
figge77 diyAudio Member Join Date: Apr 2009	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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