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Old 3rd November 2012, 08:20 PM   #2231
osscar is offline osscar  Latvia
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My second LM3857 Non inverting amplifier ( 200VA 2x24V transformer; standard small bridge rectifiers with small heat-sinks ;4x4700uf filter capacitors + 4x2200uf bypass caps + 4x 1uf, snubbers caps under PSU board ; p2p installation; compact enclosure from e-bay; salvaged stepped attenuator
No hum no noise , small DC offset. I will try to measure amp later :
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Old 3rd November 2012, 09:13 PM   #2232
redjr is offline redjr  United States
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Don't know if you have any experience with the liquid cooling for PC world, but they have developed some fantastically quiet pumps and fans. Once all the air has worked completely out of the system the pumps are dead silent. You have to touch them to make sure they are working. Fans are almost as good and any trace of noise beyond ~ 12" can be eliminated by slowing them down a bit.

The major cooling is not from fan air flow. All that is needed is a steady light breeze across the fins of the radiator. A little adjustment for efficient air and liquid flow rate (less is better) does the trick. There are also some good additives that both protect any metal components and increase heat transfer.

I guarantee you can build a liquid system all the way up to the 120mm format that you can't hear past 1 foot.
I agree. I have an overclocked, 6-core AMD that is water-cooled (Corsair H70 all-in-one solution), and when the fan is dialed back, I can't hear it. Not sure I'd adopt water-cooling for an amp, but it's an interesting proposition and one that you've successfully tackled. Good stuff.
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Old 3rd November 2012, 09:19 PM   #2233
redjr is offline redjr  United States
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Originally Posted by osscar View Post
My second LM3857 Non inverting amplifier ( 200VA 2x24V transformer; standard small bridge rectifiers with small heat-sinks ;4x4700uf filter capacitors + 4x2200uf bypass caps + 4x 1uf, snubbers caps under PSU board ; p2p installation; compact enclosure from e-bay; salvaged stepped attenuator
No hum no noise , small DC offset. I will try to measure amp later :
Nice looking amp and construction. Do you have a link for the enclosure. It looks familiar, but I haven't seen that switch assembly before, and was wondering if it came with the case?
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Old 3rd November 2012, 09:25 PM   #2234
osscar is offline osscar  Latvia
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If i remember correctly member siliconray from diyaudio also have these enclosures. This enclosure have only rear panel mains socket included. Front switch done by me.
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Old 3rd November 2012, 09:35 PM   #2235
bcmbob is online now bcmbob  United States
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Thanks redjr, I posted a link over on the Pass forum where things run hotter. Maybe someone there will give it a shot.
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Old 3rd November 2012, 09:36 PM   #2236
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they are buyable on ebay from china.

just search ebay. sometimes they come up when you search for 'pga2311' since many are sold as boxes for preamps.
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Old 4th November 2012, 12:05 AM   #2237
redjr is offline redjr  United States
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they are buyable on ebay from china.

just search ebay. sometimes they come up when you search for 'pga2311' since many are sold as boxes for preamps.
I've used several of those style enclosures from China and very happy with them. The one in question just looked a little 'dresser' hence the question. I was particularly intrigued by the push-button switch with the flange ring on the front. Looks fancier than what I use.
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Old 4th November 2012, 12:53 AM   #2238
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Originally Posted by osscar View Post
My second LM3857 Non inverting amplifier ( 200VA 2x24V transformer; standard small bridge rectifiers with small heat-sinks ;4x4700uf filter capacitors + 4x2200uf bypass caps + 4x 1uf, snubbers caps under PSU board ; p2p installation; compact enclosure from e-bay; salvaged stepped attenuator
No hum no noise , small DC offset. I will try to measure amp later :
Congratulations osscar! That is a very nice integrated amplifier! Very neat and compact
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Old 4th November 2012, 06:30 AM   #2239
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@osscar: very nice build. It looks like you have some speaker protection in there too.
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Old 4th November 2012, 04:06 PM   #2240
Pato666 is offline Pato666  Argentina
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@osscar: very nice build. It looks like you have some speaker protection in there too.
I agree
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