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Old 24th June 2008, 10:53 AM   #1
dre is offline dre
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Default which chip for my transformer

Hi, another which chip question:

I've bought a transformer of plus and minus 16Volt.

Which chip should I use for my gainclone with this transformer: LM3875, LM1875 or other?
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Old 24th June 2008, 12:27 PM   #2
DC Dave is offline DC Dave  United States
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First, how big is the transformer?

The voltage will work with either chip. I would try both 1875 and 3875. It will only cost an extra $20 or so to test out which you like better. The transformer is usually the most expensive part. Build a couple amp modules and compare them.
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Old 24th June 2008, 03:21 PM   #3
dre is offline dre
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The transformer is rated 5 Ampere
So 32 * 5 = 160VA
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Old 24th June 2008, 03:32 PM   #4
Nordic is offline Nordic  South Africa
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That is ok for LM1875...
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Old 25th June 2008, 10:44 AM   #5
AndrewT is offline AndrewT  Scotland
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most of the chipamps will run well from a 160VA 16-0-16Vac transformer.
You could even wire up a two channel amp from this transformer.
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Old 26th June 2008, 12:18 PM   #6
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Hi jacking the thread....
So a 330Va - 2x18v is suitable with LM3886 too ?
Thanks
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Old 26th June 2008, 12:21 PM   #7
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by korben69
Hi jacking the thread....
So a 330Va - 2x18v is suitable with LM3886 too ?
Thanks
yes, look up the datasheet.
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Old 7th July 2008, 06:15 PM   #8
amo is offline amo  United States
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Any suggestions on how to use 30-30 output trans (460VA) for 3886 or 3875? I can get these for USD $35!! besides, major outlets have a standard config of 30-30... I was planning to run several modules from such a tranni.
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Old 7th July 2008, 06:37 PM   #9
AndrewT is offline AndrewT  Scotland
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I suggested 28Vac as the maximum for 3886 on moderate 8ohm speakers, but some came back saying 25Vac was a more sensible maximum.
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Old 7th July 2008, 06:41 PM   #10
wg_ski is offline wg_ski  United States
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+/-42 a bit high for a chip amp, but you can add a few turns of #14 THHN and put it in series with the primary - that will drop or raise the output depending on polarity. You could add turns to the secondaries, but that's a bit tricky if they need to be well balanced.


BTW - those are some nice trafos that Tanners has. GET THEM BEFORE THEY ARE GONE. That's not a threat, it's a promise
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