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Old 28th March 2011, 12:45 AM   #1
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Question My first Gainclone!!

This is my first serious project. It's a LM3886 from chipamp.com. I got my inspiration from all the guys on this great forum!
Case is aircraft aluminum as well as the transformer cover. Isolating feet were machined from copper/bronze alloy. I machined the heatsink from solid copper billet. Red oak with a cherry stain dresses the sides. I cut the volume knob from acrylic and the bead blasted for a frosted look.
The transformer is a 300va 25 volt dual secondarys. Right now I am building some full range speakers to pair it with. I need to tidy up the wires still but overall I am happy with it.
I was wondering, if I wanted to put a subwoofer out for a powered sub what would be the best way to do this. I've searched but having trouble finding clear suggestions.
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Old 28th March 2011, 01:50 AM   #2
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Congratulatons. It looks good, with a decidedly DIY retro-modern aesthetic. Nice work!

How you implement a subwoofer depends on where you want to split the LF and HF frequencies.
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Old 28th March 2011, 03:03 PM   #3
maurycy is offline maurycy  United States
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Wow. That's a really nice amplifier. My first one looked like crap comparing to yours. No wonder my wife was against putting it under the TV :-)

I really like the volume knob and side panels.
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Old 28th March 2011, 03:09 PM   #4
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A very well done project, even better that you can achieve the look with just one.

So, how does it sound?

Here's a decent method for adding a sub out for stereo subs.

http://www.electra-print.com/pvabass.php

Last edited by d to the g; 28th March 2011 at 03:10 PM. Reason: linkage
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Old 28th March 2011, 03:42 PM   #5
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Thanks for the compliments. Very surprised on the quality of sound and the power out of such a small number of components.
I'll give that sub-out circuit a try.
If anyone is interested I can machine some costume isolating feet/spikes for your amp/speakers. I would gladly give out a few sets for all the knowledge I have gained from you guys!
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Old 28th March 2011, 03:52 PM   #6
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Muddobber,

I'd suggest selling the feet on the swap meet, and donating the proceeds directly to the diyaudio support fund.

D
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