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-   -   Mini Water Cooled GainClone? (http://www.diyaudio.com/forums/chip-amps/15172-mini-water-cooled-gainclone.html)

SkinnyBoy 15th May 2003 04:17 AM

Mini Water Cooled GainClone?
 
So, can it be done? CAn I build 2 gainclones into TINY sealed Aluminium box with the chips mounted on the case, put an inlet on one side on the box, an outlet on the other and pump water straight through it...??? I would paint the components on the inside with latex... any problems so far? I have one.. lol the sockets.. but apart from that? I wanna make a TINY Class A/B amplifier cabable of atleast 40watts Per channel... lol

is it...
A) Good idea?
B) Bad idea?
C) waste of time?
D) All of the above
lol
and don't forget your life lines.. :D

sangram 15th May 2003 07:40 AM

A custom waterblock will be the best. I wouldn't like immersing all the components in water but a small 1" square waterblock should do a GC perfectly. Anybody who makes custom WBs should be able to do it for you - you'll find some nutty OC'ers who OC their video cards and use watercooling - some of their stuff looks uber cool. Not temperature wise, but I bet they do that pretty well too.

Clamping on a chip to a WB is a lot easier than trying to fit one into a socket. One clamp and it's done. May not be advisable to drill into the WB...

So it can be a tiny box, a couple of inches on all sides - enough to hold all the parts for a monoblock GC - and a small waterblock mounted onto the chip. two pipes should be enough - some WBs have dual outlet, single inlet, or single inlet, four outlets - but that's only for CPUs disspating tons of heat - 60 watts plus, and to be kept at temps around 45-50 celsius for best operation. I doubt you'll need much horsepower in the pumps or a very large radiator/reservoir...

Remember that passive cooling is the quietest possible way to cool a chip. Any active cooling will be noisy. The reason WC is regarded as 'silent' is because in comparison to normal CPU coolers, they are fairly quiet. But compared to a normal heatsink, there will be pump whine and some amount of turbulence noise as the water goes through the pipes.

Sockets are the least of issues. I would wire out to inline gold-plated RCAs and a banana for the speaker. XLR for the Power. The RCA will fit on the case. Speaker terminals are tough, inline or bare wire would be best. Power is even tougher, maybe Cat5 would work but I dunno bout the current capacity.

Rarkov 15th May 2003 11:27 AM

Hi,
Don't lol, but I would say you don't need any more heatsinking than the case. I ran two gainclones (LM3875s) with 18V secondaries (about 23VDC). I had Mica silicon pads between the case and the chip. It never cuts out or gets too hot to touch. In fact - It hardly gets warm. Here is a suggestion...These chips are built like brick s**t houses and are more protected than you could believe possible. The chances are that heat / over powering them etc will just trigger their protection circuitry. Why not build one without the water cooling and cost (and noise - you still need a pump - most fish tank pumps are noisy) and see if it works. If not, you've lost nothing by water cooling it.

As for sockets, you could always use silicon sealer to seal them up if you wanted to do it that way. Your problem is getting all the wire connections covered and sealed...If even the tiniest bit of water is allowed to make contact then :flame: :RIP:

Gaz

SkinnyBoy 15th May 2003 12:01 PM

Yeah, well, I am talking small.. lol like a box that is 8cm long... 5cm wide and 3sm high... and, I would like plastic... why? becasue I already have it... :) lol I like all the ideas.... but I want something small and cheap... Perhaps I could just mount the chips on a small heatsink in the plastic case and seal it.. like with the metal, but plastic... and pump water through that.. lol

Matttcattt 15th May 2003 12:51 PM

why not make the gainclone in a small metal box, fit cables, and fill it with epoxy, make sure its full, and watertight. then put it in a slightly bigger box (plastic or metal) and pump water through the gap between the boxes. just an idea.

or make the gainclone in a metal box, and bot some square tube to the side, and run water through that.

:rolleyes: thinks about trying this himself :D

SkinnyBoy 15th May 2003 01:05 PM

Umm... it was supposed to be small.. lol

Rarkov 15th May 2003 01:28 PM

I take it the water cooling is only for novelty value then? lol
You really don't need it at all! lol
Speak later lol
gaz

SkinnyBoy 15th May 2003 01:33 PM

Yes... don't need it.. want it.. want a competition with a friend for the smallest amp.. :D lol

Rarkov 15th May 2003 02:03 PM

It'd be even smaller without water cooling...but to answer you question - yes it can be done. Have you thought about putting a "peltier" on the outside? I can't remember is that's what they're called but are usually used in conjunction with water cooling. They are hot on one side and extremely cold on the other. If I remember correctly, it is actually these that cool things down and the water cooling wicks away their heat. But with a small one, you'd get away without cooling. All the bonuses but without the cost / size.

Gaz

SkinnyBoy 15th May 2003 02:05 PM

peltiers cost too much and are too big.. :D lol
now you know my budget (nothing +-$5) lol


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