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Old 23rd January 2010, 01:46 AM   #1
Plundering the Planet From the Comfort of Home
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Default PS for simple fet preamp

Is this a good approach to power a 24v preamp board? I include the schematic of the preamp also. I'd use a hefty transformer to feed the regulator board.
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Old 23rd January 2010, 04:04 AM   #2
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Originally Posted by DreadPirate View Post
Is this a good approach to power a 24v preamp board? I include the schematic of the preamp also. I'd use a hefty transformer to feed the regulator board.
Why a hefty transformer? That preamp only uses a few mA per channel. I'd consider using a wall-wart to keep any hum fields far away since it needs so little power. The regulator is fine BTW.

G
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Old 23rd January 2010, 04:11 PM   #3
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"Hefty" transformers (18V/4a) relative to what the vendor recommends for it (18V/500ma) is all I have, so hefty it is going to have to be unless I find something closer. Would a computer psu have something I could use?
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Old 23rd January 2010, 06:07 PM   #4
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Originally Posted by DreadPirate View Post
"Hefty" transformers (18V/4a) relative to what the vendor recommends for it (18V/500ma) is all I have, so hefty it is going to have to be unless I find something closer. Would a computer psu have something I could use?
It was more from the standpoint of why buy a big transformer when it isn't needed. If you already have it, you may as well use it as it certainly will cause no harm. It really only needs <50 mA.

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