Stacked TDA1543. Need matching? - diyAudio
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Old 7th June 2008, 04:57 AM   #1
drjlo is offline drjlo  United States
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Default Stacked TDA1543. Need matching?

For say a TDA1543 x16 parallel DAC, how important is matching? As you use more number, I would assume the pluses and minuses will sort of hopefully even out..

I ask b/c I can't find any source that sells matched TDA1543 chips. If you know a source for matched TDA1543 chips, do let me know. Heck, let me know if you know a good source of unmatched chips in U.S.
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Old 7th June 2008, 05:57 AM   #2
flshzug is offline flshzug  Antarctica
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just pick 1 good out of 200 and be done with it.
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Old 7th June 2008, 07:35 PM   #3
drjlo is offline drjlo  United States
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I already have 8x TDA1543 DAC. I'm just trying to add 8 more as I have empty sockets for them..
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Old 8th June 2008, 06:21 AM   #4
flshzug is offline flshzug  Antarctica
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okay : D
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Old 9th June 2008, 12:26 AM   #5
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They don't need matching.
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Old 9th June 2008, 10:09 PM   #6
dddac is offline dddac  Germany
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I tried it once, but could not find any chips (tried 300) which were clearly better than the rest. That is when my idea of stacking chips was born by the way

ergo, save your time and just stack more chips

received this week this response from a DIY who went from 12 to 24 chips:

...two boards (24 chips) it's a must have for all, a big improvement. Shame i don't have space for a third one...

take care
doede
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Old 10th June 2008, 12:18 AM   #7
amc184 is offline amc184  New Zealand
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A good source for TDA1543 ICs is Futurlec, with a price of only US$1.95 for small quantities. I have used these guys before, they are fairly slow, and their range is fairly limited, but they sure are cheap.

As people have said, you don't really match these ICs, the paralleling is to average out the differences in each chip.
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Old 10th June 2008, 03:26 AM   #8
drjlo is offline drjlo  United States
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Quote:
Originally posted by amc184
A good source for TDA1543 ICs is Futurlec, with a price of only US$1.95 for small quantities. I have used these guys before, they are fairly slow, and their range is fairly limited, but they sure are cheap.

As people have said, you don't really match these ICs, the paralleling is to average out the differences in each chip.
Darn. I just missed this post by a day and already ordered them on Ebay for the usual $4.50/each. Maybe next time.

Now if I could just find some cheap heatsinks for the TDA1543's, ones to go on top surface of each chip or maybe two across..
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Old 10th June 2008, 05:33 AM   #9
dddac is offline dddac  Germany
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seems my site is the secret place
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