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Old 26th March 2013, 05:29 PM   #11
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Quote:
Originally Posted by sofaspud View Post
Why don't you use a voltage regulator?
Because I have no idea what I am doing, basically, and I am frugal. If I can cobble something together from my box of components, then I'd rather do it that way.

Edit: I just looked on ebay and it appears as though a voltage regulator is as big or bigger than the existing DC supply I already have in there.

The point is to get rid of the DC supply and get ~13.5v DC from the 12v AC supply with the fewest, cheapest components, many of which I probably have in my box o' goodies.

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Old 26th March 2013, 05:34 PM   #12
FoMoCo is offline FoMoCo  United States
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Originally Posted by cogitech View Post
Hmmm. OK. Well, I really only need to drop down to 14 volts. Not sure how much that changes things.
Cheap and dirty solution: A few diodes in series. They drop about .65V a piece for plain old silicon. I'd use 6 in case of high line. The voltage rating (PIV) doesn't matter. Switching performance doesn't matter. Standard cheap silicon diodes are fine. Current rating does matter. I'd use a 6 amp diode. (Anywhere from 5 to 10 should be okay.)
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Old 26th March 2013, 05:36 PM   #13
AndrewT is online now AndrewT  Scotland
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It is sometimes considered poor practice for digital signals to share PSUs with analogue signals.
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Old 26th March 2013, 05:37 PM   #14
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Originally Posted by FoMoCo View Post
Cheap and dirty solution: A few diodes in series. They drop about .65V a piece for plain old silicon. I'd use 6 in case of high line. The voltage rating (PIV) doesn't matter. Switching performance doesn't matter. Standard cheap silicon diodes are fine. Current rating does matter. I'd use a 6 amp diode. (Anywhere from 5 to 10 should be okay.)
Nice! I have some diodes laying around. Not sure on the current ratings, but I'll see what I have and do some tinkering.

Thanks!
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Old 26th March 2013, 05:38 PM   #15
AndrewT is online now AndrewT  Scotland
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1n400x are 1A,
1n540x are 3A.
The pulse rating for these is very much higher.
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Old 26th March 2013, 05:41 PM   #16
FoMoCo is offline FoMoCo  United States
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On second thought... Your preamp may require an isolated supply. Without seeing the schematic, I can't be sure. You may wish to just leave things as it is.
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Old 26th March 2013, 05:44 PM   #17
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Originally Posted by FoMoCo View Post
On second thought... Your preamp may require an isolated supply. Without seeing the schematic, I can't be sure. You may wish to just leave things as it is.
Will I damage it by trying, or will it simply not work? It's a $22 board, so I'm not super paranoid about it. I can always revert back to dual supplies...

A part of me just wants to see if I can do it.

Know the feeling?
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Old 26th March 2013, 05:46 PM   #18
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Why do you want to get rid of the second supply? If I may ask
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Old 26th March 2013, 05:50 PM   #19
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Originally Posted by alexmoose View Post
Why do you want to get rid of the second supply? If I may ask
I dunno. It just seems so... superfluous.

Also, the larger supply has more reserve juice available for the amp, which is never a bad thing for these TA2020 chips (AFAIK).

But mostly... because I want to see if I can build a rectifier and make it work.

I'm one of those dangerous people with no formal electronics training and way too much enthusiasm and spare parts.
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Old 26th March 2013, 05:56 PM   #20
FoMoCo is offline FoMoCo  United States
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Originally Posted by cogitech View Post
Will I damage it by trying, or will it simply not work? It's a $22 board, so I'm not super paranoid about it. I can always revert back to dual supplies...
Without seeing the schematic, I can't say. I'd assume that it'll trash both the amp and the pre-amp to be safe.
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