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PostPosted: 10 Jun 2010, 06:54 
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Joined: 18 May 2010, 09:33
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Hello,

I have the power supply part of my amp built up to the point that I am getting + and - 42VDC on the tank caps, I have snubbers on the bridge diodes all is well so far. This will be a stereo application into 8 ohms. Two questions, do I run twisted pair of + and _ VDC twisting both hot wires together and then to each amp? Should the Tank bypass caps be at the cap output or closer to the amps?

Thanks

Alan


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PostPosted: 10 Jun 2010, 20:57 
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Hi Alan, it is generally not necessary to twist DC wires.

You will need a good size heatsink at that voltage. 84V is the limit of the chip - right where you are at. Did you measure the supply with no load?

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PostPosted: 10 Jun 2010, 21:13 
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Yes it was a no load measurement, I did not realize the Max voltage supply was a combination of the rail voltages.

Alan


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PostPosted: 10 Jun 2010, 21:37 
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With a load, the voltage will sag somewhat, possibly up to a couple of volts on each side. So under use it may be in the 80V range. When there is no signal, the limit is 94V so technically you should be ok, but you are close to the limit.

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PostPosted: 13 Jun 2010, 11:07 
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Joined: 18 May 2010, 09:33
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You say it is generally not required to twist DC wires, is there any reason not to? For neatness sake I would like to twist the plus and minus wires from the tank caps to the chip. Unless it will lessen the quality?

Alan


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PostPosted: 14 Jun 2010, 00:12 
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Hi Alan,

there's no reason not to twist the DC supply wires (and no to do so..).
You can twist them if you like it, but it won't give you any advantages.

It doesn't degrade the quality if you go to twist em.
With a little portion of luck you might get a little shielding so.

AC wires are twisted together, to achieve a neutralization of the magnetic strayfield,
caused through the AC path.

Now, it depends on your personal taste.

Have fun ;-).

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Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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