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Old 1st May 2013, 10:16 AM   #1851
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it is aleph 60 mono Block
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Old 7th May 2013, 01:02 PM   #1852
Eric is offline Eric  United States
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Default My Daughter's ACA

Last weekend, my daughter and I built an Amp Camp Amp for her birthday. The full story is here.

In this thread, I wanted to add more pictures of the amp itself with the hope that it might give someone else some ideas. The chassis is made from a 1x4" piece of hard maple that I picked up at the local hardware store. It was sanded and finished with a Fruitwood stain (very light color) and topped off with two coats of Polyurethane.

The sinks are the 2U sinks from the DIYAudio store. I had to route out the underside of the top plate making it thinner in order to make room for the PCB when mounted on the sink. The front panel is a double thickness of wood, with the inner piece cut smaller. This provides a way to drive screws through the heat sink directly into the wood on the backside of the front panel, keeping things a little cleaner looking.

I also cut a small vent in the rear panel to allow some warm air to escape. The front and rear panels extend down beyond the bottom of sink by about 1/2" to allow some air up into the chassis. Not shown in the photo are the little rubber "feet" that I added to the bottom. I used the left over self-adhesive gasket material from the speakers to keep the amp from scratching up the surface of her dresser.

The completed amp gets mildly warm. While I haven't measured it, I'd guess it barely sees 10-15 above body temp.

When powered on, the amp is DEAD SILENT. No hiss, no hum, just silence until you press Play.
Attached Images
File Type: jpg ACA Front.JPG (44.1 KB, 998 views)
File Type: jpg ACA Side.JPG (35.9 KB, 972 views)
File Type: jpg ACA Rear.JPG (41.3 KB, 963 views)
File Type: jpg ACA Under.JPG (60.9 KB, 965 views)
File Type: jpg ACA IO.JPG (54.3 KB, 942 views)
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Last edited by Eric; 7th May 2013 at 01:32 PM.
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Old 7th May 2013, 01:16 PM   #1853
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Eric, Any concern for internal air circulation? I see a slot in the back...
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Old 7th May 2013, 01:27 PM   #1854
Eric is offline Eric  United States
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Hi Vince,

I was just thinking since the chassis was wood rather than metal, it might be better to allow some way for air to move inside. I don't really see this as a major concern as all of the components inside are rather well behaved. The big power resistors seem to run at about body temp and the sinks are just a bit warmer than that.

I think it was more of a "because I could" design feature...
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Old 7th May 2013, 02:09 PM   #1855
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Nice looking amp. If concerned about the heat, seems like one could easily route a 1/4" to 1/2" wide slot top center and add some complementary holes or slots on the bottom. Looks like the bottom sits up enought to make that workable.

Jumped to the top of my case list. I have the ACA kit and plenty of aluminum, but I also have a couple of smallish pieces of Paduak that haven't been assigned to a project.
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Old 7th May 2013, 02:23 PM   #1856
Eric is offline Eric  United States
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Oooo... I like Paduak! I was thinking of getting my hands on some of this for my next speaker project.
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Old 7th May 2013, 04:40 PM   #1857
WalterW is offline WalterW  Netherlands
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Very nice looking Amp! I wouldn't have any concern for internal air circulation...
Your daughter is so lucky, having to listen to a Pass design with her MP3 and Ipod
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Old 7th May 2013, 05:47 PM   #1858
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Quote:
Originally Posted by Eric View Post
When powered on, the amp is DEAD SILENT. No hiss, no hum, just silence until you press Play.
yup, one of the perks of 40khz smps operation

btw, very nice enclosure indeed !
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Old 7th May 2013, 11:50 PM   #1859
admc007 is offline admc007  Scotland
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@Eric, that is a classy little amp!
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Old 8th May 2013, 02:16 AM   #1860
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Default Paduak.....paduak....!!

Quote:
Originally Posted by Eric View Post
Oooo... I like Paduak! I was thinking of getting my hands on some of this for my next speaker project.
If you like paduak, check out post #728 in this thread. I love using this wood on my amps!
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