suitable power supply for dozen opamps? - Page 3 - diyAudio
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Old 2nd June 2014, 03:13 PM   #21
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Default 15 VOLT +/- REGULATED SUPPLY

Hello
greetings simple regulated supply used in studio series preamplifier
warm regards
andrew
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Old 2nd June 2014, 03:25 PM   #22
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Default 15 VOLT +/- REGULATED SUPPLY

sorry this is correct schematic
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Old 2nd June 2014, 03:26 PM   #23
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ac transformer 18 0 18 2 amps use heat sink for LM317T LM337T
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Old 3rd June 2014, 11:28 AM   #24
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cheers moo, this was buggin my head all night ...

.. never really mastered electronics at school, failed physics because of it, passed second time round though,

I read EL transformer is more suitable for low level applications such as this over toroid...
However do I still need to take any precautionary mesures to supress humming regarding distance?

Originally I was going to incoorporate all of this into a butter dish for simplicity but it looks like I'll need something slightly bigger...
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Old 3rd June 2014, 11:42 AM   #25
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Radiated hum from the tranny shouldn't be an issue unless you wrap wires round or against it. Just keep a few inches space between it and the PCB/signal wiring and it will fine.

Ahhh, a biscuit tin amplifier.. nearly

It might be worth splashing out on something more suitable. Again, CPC stock loads.
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Old 3rd June 2014, 11:54 AM   #26
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Ok will do

cpc Order Total: 13.04. Bargain.

I appreicate the input on here, diyaudio really is invaluable.
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Old 3rd June 2014, 12:18 PM   #27
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You're welcome. If you are ordering its always worth adding a few extras to the list. Small caps come to mind, useful for extra decoupling.
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Old 3rd June 2014, 02:30 PM   #28
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Minimum order quantity was actually 5, so I have 3 extra caps ...
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Old 3rd June 2014, 02:54 PM   #29
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by giro1991 View Post
Minimum order quantity was actually 5, so I have 3 extra caps ...
Well there you go you see. There are always options You could double up on the caps to make 4400uf or have a C/R/C arrangement using say a 2.2 ohm resistor in the chain.
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Old 5th June 2014, 12:17 PM   #30
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what does c-p-c achieve exactly? don't wan't to make it too complex unless it enhances performace....

I'm going to put it in larger tupper ware then, not too keen on metal box.

I remember reading a while ago somewhere, isolating commons is good practice?
On interconnects the external ring is common/gnd, they act as a common line between devices, (in my case amp to 3way and all connected units).

If I wire the common from the 3 boards together but NOT to the GND of the regulator, would this minimise noise?
essentially isolating grounds between devices, instead of them all being lumped together,
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