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Old 4th April 2013, 01:04 PM   #1
srinath is offline srinath  United States
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Default Chip amp for 58vdc

I have a dead power amp that I am thinking of re purposing to be a chip amp housing.

The cool thing is it has controls and power meters all run out of separate boards etc.

The thing has a 57-58 vdc supply. Is there a chip amp that would use that sort of voltage ?

Thanks.
Srinath.
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Old 4th April 2013, 03:12 PM   #2
macboy is offline macboy  Canada
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Is that 58 V measured from + to - rail, or from each rail to ground? No chipamp that I know of can handle +/-58 V.

National (TI) makes a driver IC, which requires separate output transistors plus a handful of other components, lme49810. That may be as close to a chipamp as you will get on +/- 58 V rails.
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Old 4th April 2013, 03:43 PM   #3
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Quote:
Originally Posted by macboy View Post
Is that 58 V measured from + to - rail, or from each rail to ground? No chipamp that I know of can handle +/-58 V.

National (TI) makes a driver IC, which requires separate output transistors plus a handful of other components, lme49810. That may be as close to a chipamp as you will get on +/- 58 V rails.
There are several Sanyo STK series chip amps that can handle +/-58V DC rails...

If you design requirement is for 100+ Watts but don't need ultra low distortion those would fit the bill nicely. Some even have pretty low distortion figures, like the STK4048XI:
http://www.pablin.com.ar/electron/ci.../stk4048XI.pdf

-Charlie
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Old 4th April 2013, 07:18 PM   #4
srinath is offline srinath  United States
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It is a 58 +/- dc. Let me try the lme 49810.
I saw some sanyo stk's - and I'll check them out too. Thanks guys.

Cool.
Srinath.
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Old 4th April 2013, 07:56 PM   #5
srinath is offline srinath  United States
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The lme49810 kits on ebay need a 20-24v ac for the protect - my amp doesn't have that (or maybe its in the lighting circuit (which I could put led's in and not exceed the overall capacity)

Cool.
Srinath.
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Old 7th April 2013, 03:11 AM   #6
Jsixis is offline Jsixis  United States
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good luck in your search, I seem to have a whole garage full of power supplies that are too big for chip amps yet not big enough for tube amps
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Old 7th April 2013, 01:38 PM   #7
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STK4050 is the most powerful stk series?????
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Old 9th April 2013, 04:11 PM   #8
srinath is offline srinath  United States
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stk4046 kit -

STK4046V Two Channel Class AB Audio Power Amplifier IC 120 Watt RMS Liquidation | eBay

It can run 57vdc right ?

I'd like to see if I can get a protect circuit in the amp as well as if the thing will run the meters.

How is the thing for clarity ? has anyone heard a stk4046V amp

Thanks.
Srinath.
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Old 9th April 2013, 04:50 PM   #9
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I don't know if the STK series should really be rated that highly. They are after all discontinued, a bit bulky, and they predate the still not complete acceptance of chip amps within hi fi. They are also near impossible to re-source if something goes wrong.

How about unwinding one of your transformers a touch and bringing it down to a more reasonable voltage? Or using them as an original power supply for a regulator (though even then that's a fair voltage drop). You will of course end up with an even lower impedance transformer and something that probably has a higher Va rating than you could normally purchase.
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Old 11th April 2013, 04:10 AM   #10
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If you are thinking of solid state since by now, u have found that the dc u have is much higher, think Leach amp as it has good literature for constructors of all skill levels.

If u intend to buy a ready made kit, then many will be available.

Gajanan Phadte
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