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Old 14th August 2008, 11:15 AM   #21
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joka22

Like these........

http://www.madaboutsound.com/prod_de...7&sa=cf&ctid=7

He's a moderator here and a smashing dead straight bloke to do business with. I have LM3875s using a pair of these in a metal enclosure which gets faintly warm after 16 hours at moderate volume.

Vikash has a non commercial site as well which should be of interest to you. I'm using his ported FR125 design with my chipamp and like them very much. It's here.....

http://www.vikash.info/audio/

John
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Old 14th August 2008, 11:27 AM   #22
joka22 is offline joka22  United Kingdom
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i jus clicked on the lm chip in vikash - i noticed for scrap parts he used a power supply heatsink and i got two of them time to erm i hope i can somehow connect them heatsinks to the other heatsinks with nuts and bolts.
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Old 14th August 2008, 11:30 AM   #23
lineup is offline lineup  Sweden
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Quote:
Originally posted by john blackburn
joka22
It would also put the heatsink between the chips and your transformer to give some screening, and keep the signal wires shorter. John
very good suggestion john

I have done this myself a number of times:
-> heatsink plates between the transformer and the circuitry
this also increases the physical distance between trafo / board

All trafos has got a pretty strong electromagnetic field around them
-> this disturbing field is bigger for old E-Type Core transformers
-> and a bit smaller for round toroid core transformers
however TOROID round transformer cores HAVE this electromagnetic field, too

Attachment.
One of my examples with
my homemade aluminum plate heatsinks between E-Type trafos and circuits
(One 4-5 Watt RMS True Class A amplifier)
Attached Images
File Type: jpg lineup_aluminum_heatsinks_shielding.jpg (49.7 KB, 265 views)
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Old 14th August 2008, 12:03 PM   #24
AndrewT is offline AndrewT  Scotland
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try Ebay.
But don't bid high, be patient.
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Old 14th August 2008, 06:38 PM   #25
joka22 is offline joka22  United Kingdom
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i tookm out the heatsinks out of the computer psu i had two psus spare so one for each chip and i have mounted them over the old heatsinks and the chips area covered now.
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Old 14th August 2008, 08:24 PM   #26
lineup is offline lineup  Sweden
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Quote:
Originally posted by joka22
i jus clicked on the lm chip in vikash - i noticed for scrap parts he used a power supply heatsink and i got two of them time to erm i hope i can somehow connect them heatsinks to the other heatsinks with nuts and bolts.
Images are from www.vikash.info/audio

Page: http://www.vikash.info/audio/chipamp-lm3886/

This is a nice concept, that I would use.
Niot only for chip amps.
But for any power amplifier with the need of heatsinking.

Build your box using two heatsinks as 2 of them sides of the box.

Click the image to open in full size.
Click the image to open in full size.
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Old 14th August 2008, 08:48 PM   #27
joka22 is offline joka22  United Kingdom
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I ahve used comp psu heatsinks to cover the area of the chip amps and attached the psu heatsinks to the other heatsinks.

here is a link of the heatsinks and chip amp connected toriod going to be delivered on the 18 thats why i havnt done much.

http://img526.imageshack.us/my.php?i...eatisnkcw7.jpg



I got a spare toriod taken from the prevoius amp it was a pa carnival type amp. The toriod is 43v dual secondary and i have bunch of 6 toshiba 2n3773 trans some salvaged resitors and caps and swicthes and volume pots but not gona use the vol pots in my gainclone.

anyone wants these let me know i trade the whole lot for four output speaker binding post and two rca input phono and silver wire for input or something that i may need for my gainclone, i still want volume pot but not these cheap type the peter daniel is expensive and am out of budget i bought kenwood amp 3750 dexoit isp alchol and other stuff.
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Old 14th August 2008, 08:57 PM   #28
lineup is offline lineup  Sweden
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looks alright, joka22
there will be no problem The Chips will get too hot for you
because you have so much heatsinking

these chip amps does not need very much heatsinks
for normal use
(only if you play very hard with speakers for several minutes)

what is the yellow cone speaker under the chassis?
is it one FOCAL or one SCAN-SPEAK woofer ... or
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Old 14th August 2008, 09:01 PM   #29
joka22 is offline joka22  United Kingdom
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that a nasty cheap kevlar pa speaker unfortunately i blown it using the pa amp and i damaged the pa amp so i stripped it.
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Old 14th August 2008, 09:06 PM   #30
lineup is offline lineup  Sweden
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yes, Kevlar
this yellow colour kevlar is in one of my FOCAL mid-drivers
this is why I thought it might be focal

maybe focal did use same material for cone, as in that PA
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