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Old 26th December 2012, 01:58 PM   #1
redjr is offline redjr  United States
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Default My latest TDA7294 amp build

Here are a few pics showing the progress of my latest amp build. It's a small amp @ about 70wpc. I decided to give it to my son as a Christmas present this year.

Haven't done a lot of listening yet, but we did hook it up to a new pair of DefTech Studio Monitors 350 Christmas morning, and it sounded very good indeed, for a relatively inexpensive build. Anyway, at ~70 watts it should work well for all but the most inefficient speakers.

Rick
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Old 26th December 2012, 02:13 PM   #2
sunsong is offline sunsong  China
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Wow !you do very professional, very good craft,Electrolytic capacitor with glue fixed good will be more perfect.
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Old 26th December 2012, 02:25 PM   #3
wahab is offline wahab  Algeria
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For 70W/channel the heatspreaders looks weak since they are not
in tight thermal continuity with the casing....
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Old 26th December 2012, 05:42 PM   #4
redjr is offline redjr  United States
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Quote:
Originally Posted by wahab View Post
For 70W/channel the heatspreaders looks weak since they are not
in tight thermal continuity with the casing....
That's of mild concern because this amp will never likely see 70 watts of continuous power output. Now it appears to run relatively cool at low to moderate volume levels. If it does become a future issue, a small rectangle piece of aluminum 1/16"-1/8" thick across the top and bottom of the heat-sinks will help thermally couple it with the case.
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Old 27th December 2012, 11:56 AM   #5
AndrewT is online now AndrewT  Scotland
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He is right. The sink back plate is very thin. It better suits having a multiple devices dissipating over a larger proportion of the back plate surface.

I can't see any ventilation.
How do you know it runs cold/cool if the air can't get out?
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Old 27th December 2012, 03:41 PM   #6
redjr is offline redjr  United States
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I believe under normal, modest listening levels it will perform within published temps. Data sheet suggests 0-70 degrees Celsius (C). I measured the temp this morning for about an hour with a probe attached between the heatsinks and it stabilized around 53.1 degrees C. This was at typical listening levels - at least for me. Not sure if this is too hot, but at least it's within SOP. If, in the future, it requires further heat reduction, I can easily sink it to the top and bottom of the enclosure to help dissipate more heat.

I obviously would have preferred vents in the enclosure, but I was working with what I had.
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