What size heatsink is needed for Rod's 3A amp? - diyAudio
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Old 21st February 2002, 07:21 PM   #1
kec is offline kec  United States
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Default What size heatsink is needed for Rod's 3A amp?

I'm interested in Rod's 3A project. What's a good heatsink for it? How big should it be?

For anyone that has one, does it run real hot?

Thanks,
Ken
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Old 22nd February 2002, 10:51 AM   #2
ih is offline ih
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Fairly big, but not excessively so. Rod recommends a 1deg/C heatsink - I used a 0.7deg/C heatsink with TO-3 outputs, and cut a hole in the back of my case so it could mount on the outside.

In hindsight, that's overkill - I could've used a smaller one, and mounted it inside the case. It gets warm, but doesn't heat up much more even running hard.
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Old 22nd February 2002, 05:22 PM   #3
paulb is offline paulb  Canada
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This amp is quite flexible in regards to power supply voltage and load, and the heatsink requirements will vary accordingly. I'm using a +/-25 VDC supply and am driving a 4-ohm load. It sounds like my heatsinks are about the same as ih's, and I mounted them on the outside as well. They barely get warm to the touch, but I don't run at significant power very often.
Later, I'll change to a +/-42VDC supply to run an 8-ohm speaker. My feeling was that this higher voltage was a bit too much for driving 4 ohms.
I'm very happy with this amp. I'd go with the biggest heatsinks that are reasonable for your budget and the case you select; reliability will increase if you keep the temperature down.
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Old 25th February 2002, 09:08 PM   #4
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Dear kec,

I agree with PaulB:

"I'd go with the biggest heatsinks that are reasonable for your budget and the case you select; reliability will increase if you keep the temperature down."

If your heatsinks seems to be too small you can always add a fan


Best regards,

HB
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Old 26th February 2002, 01:59 AM   #5
blmn is offline blmn  Brazil
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Just to add something to Hugo's statement, maybe some thermal sensor to start the fan just when the heatsink achieve, for example 40-50 Celsius degrees, to avoid the fan's noise.

regards
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Old 26th February 2002, 02:13 AM   #6
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I beleive Rod stated in the article that a 0.6 C/W would work good for an stereo pair. I once found that kind of sinks for $20-25; if you get those prices, buying one for each would be a bit overkill, but if you have the $50 the amps would run really cool.

A friend of mine used a 1C/W on his and the amp runned just warm.
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