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

[figge77]

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]

I would probably go with one of the low noise super-regs
such as a Jung, Per-Anders or check these threads
http://www.diyaudio.com/forums/showthread.php?s=&threadid=143693

http://www.diyaudio.com/forums/showthread.php?s=&threadid=139239

 

[MJL21193]

is there any good schematics somewhere?

Yes - the datasheet:

 

[AndrewT]

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]

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]

is it good for the purpose?

Absolutely.
Here's something more complete:

 

[Sheldon]

Or if you want a bipolar shunt reg: http://www.diyaudio.com/forums/showthread.php?postid=1349112#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]

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?