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Chip Amps Amplifiers based on integrated circuits

Neurochrome LM3886DR Build
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Old 11th September 2017, 03:03 PM   #261
Mixi is offline Mixi  Austria
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ok, so here are some pictures. i'm still waiting for some shorter pre crimped cables so i can tidy up the inside a bit. but for now i'm very happy with the way it turned out.

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Old 11th September 2017, 04:22 PM   #262
tomchr is offline tomchr  Canada
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Very nice! Which chassis is that? Looks like a Modushop one, but which model?

You might be able to tidy up the supply harness with shorter wires, but what you have actually looks quite tidy already.

Did you sand off the black anodization under the grounding lug? If not, then I recommend doing so for a better connection.

Tom
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Old 11th September 2017, 05:19 PM   #263
Mixi is offline Mixi  Austria
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Thanks for your feedback, Tom! And thanks again for all your help and patience with all the questions I had!

It's a modushop galaxy chassis with the "no visible screws" option. I also turned the side panels inside out for a cleaner look.

I didn't have any sand paper when i finished it so I just scratched the surface with a screw driver to take off some anodization. I will sand it in the next couple of days and maybe take the wire to the back panel and make it even shorter.
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Old 11th September 2017, 05:31 PM   #264
scottjoplin is offline scottjoplin  Wales
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Good idea, in the meantime check you have continuity to the chassis and most importantly the pot shaft and knob. Looks good
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Old 11th September 2017, 10:43 PM   #265
chrisb is offline chrisb
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tidy job - where'd you source the heat sink?
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Old 12th September 2017, 06:47 AM   #266
Mixi is offline Mixi  Austria
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i bought it directly from fischer electronic in germany: Fischer

keeps the amp much cooler than i thought it would.
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Old 12th September 2017, 02:35 PM   #267
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by Mixi View Post
keeps the amp much cooler than i thought it would.
That's a good thing!

My design philosophy is that the amp needs to be able to deliver the full rated output power continuously without hurting itself or the user. I'm willing to reduce this requirement to: The amp needs to be able to continuously deliver a music signal at levels just below clipping. I think that's good engineering. That's also why your amp is running cool.

Many DIYers (and some commercial vendors as well) use the fact that few users ever drive the amp to clipping to justify saving a few bucks on the heat sink. They end up with an amp that'll work well under normal listening conditions but will sound harsh or even shut down if they really crank it.

Each to their own... My choice is to set you up for success. You now have an amp that'll work well for years to come. Congratulations!

Tom
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Old 14th September 2017, 01:38 AM   #268
theaudiopath is offline theaudiopath  Australia
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Nice work Tom
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Old 14th September 2017, 07:35 AM   #269
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Mixi View Post
i bought it directly from fischer electronic in germany: Fischer

keeps the amp much cooler than i thought it would.
Mixi,
did you find a download of the heatsink simulation software?
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Old 14th September 2017, 08:14 AM   #270
Mixi is offline Mixi  Austria
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nope, i don't think they offer a download.
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