GC Heat

VoLCoM · 13th July 2005, 11:06 PM

I am running my 3875 gainclone with a 4ohm load and i have a big heat sink made out of aluminium that measures about 7.5" x 3" x 1/8" full of fins on one side and they are about 2 inches long. My two chips are on the same heatsink and when the volume is at maximum it gets pretty hot. i don't know if it's normal...it's my first gainclone

should i buy another heatsink??? or its completly normal.... i searched the forums and they say that running the gainclone at 20v shoudn't dissipate any heat (mines runs at 20volt AC before rectifier and 28.5V DC after )

slackman · 13th July 2005, 11:23 PM

What about the sound? Good and loud or not as loud as you assumed?

At full volume it's normal if it runs warm/hot but take care of some points:
- are the chips isolated? If not are they isolated mounted?
- check inputs and outputs: may the gc oscillate (capacitors with wrong values)?

Some pics would help...

Michael

VoLCoM · 14th July 2005, 12:03 AM

Quote:

Originally posted by slackman
What about the sound? Good and loud or not as loud as you assumed?

At full volume it's normal if it runs warm/hot but take care of some points:
- are the chips isolated? If not are they isolated mounted?
- check inputs and outputs: may the gc oscillate (capacitors with wrong values)?

Some pics would help...

Michael

The sound is very good and loud

the chips are 3875TF (isolated)
and for the oscillation .... i bought a kit from Peter Daniel and installed everything that came in the kit so i guess they are the right values

But at low volume everything's alright i guess the heat is normal. and when i put a 8ohm load the temperature is even lower. i tought the 3875 couldn't handle 4ohm impedance

carlosfm · 14th July 2005, 12:26 AM

That heatsink is thin for the PSU voltage you are using and to drive 4 ohm speakers.
It's more indicated for convection cooling.

VoLCoM · 14th July 2005, 12:28 AM

ok, i'll find another heatsink....what are your suggestions??? ...that was just a heatsink i had lyin around... and decided to use it because it was the biggest i had

DcibeL · 20th July 2005, 08:36 PM

The heatsinks offered in this thread look like they would work great for a chipamp, as long as they are still available at $10 for 2 you really don't have a lot to lose.

13th July 2005, 11:06 PM	#1
VoLCoM diyAudio Member Join Date: Apr 2003 Location: Saint-Hubert , Quebec	GC Heat I am running my 3875 gainclone with a 4ohm load and i have a big heat sink made out of aluminium that measures about 7.5" x 3" x 1/8" full of fins on one side and they are about 2 inches long. My two chips are on the same heatsink and when the volume is at maximum it gets pretty hot. i don't know if it's normal...it's my first gainclone should i buy another heatsink??? or its completly normal.... i searched the forums and they say that running the gainclone at 20v shoudn't dissipate any heat (mines runs at 20volt AC before rectifier and 28.5V DC after )

20th July 2005, 08:36 PM	#6
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	The heatsinks offered in this thread look like they would work great for a chipamp, as long as they are still available at $10 for 2 you really don't have a lot to lose. __________________ The power of Science compels you!

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13th July 2005, 11:23 PM	#2
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	What about the sound? Good and loud or not as loud as you assumed? At full volume it's normal if it runs warm/hot but take care of some points: - are the chips isolated? If not are they isolated mounted? - check inputs and outputs: may the gc oscillate (capacitors with wrong values)? Some pics would help... Michael

14th July 2005, 12:26 AM	#4
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	That heatsink is thin for the PSU voltage you are using and to drive 4 ohm speakers. It's more indicated for convection cooling.

14th July 2005, 12:28 AM	#5
VoLCoM diyAudio Member Join Date: Apr 2003 Location: Saint-Hubert , Quebec	ok, i'll find another heatsink....what are your suggestions??? ...that was just a heatsink i had lyin around... and decided to use it because it was the biggest i had

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