Perhaps this could be made modular, say in 10W increments? Before I get in a DIY mood, how much does one of these JFETs cost?
The more I think about it, the more fun it looks. I so want to make one of those, even if I have to stay there for a week, matching and soldering like mad.
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the fever has gripped you Atilla !
I don't have the skills for this is a job, I'd be off to use a pick-n-place machine. Job would be done in minutes, clean, inspected, perfect. All SMT. Short leads, low inductance, stuck to a suitable surface for heat-sinking ?
I wondered what happened long into the nights at Mr. Pass's parties... I'll bet he buys everything in bulk.
liquid cooling or just use a bunch of actic silver or whatever the glue is called, glue them all to a normal heatsink or water block after populating the board. One could also glue them all the the sink and the do then point to point wiretm together. I think the best is to buy copper spades for heavy wire termination and glue one to each JFET. You could then run copper bus bars across each row as spreaders and screw each FET in place or solder. If soldering, I would solder the clamp and then glue the JFET to it. This method would allow an accessible way to sink them and still be able to remove an individual JFET with a screw or desolder. Howerer, I think another option is a couple computer cooling radiators with fans with a Peltier(TEC) between a couple of water blocks and a water pump. Place a rad on the inside and a rad on the outside. The TEC cools the antifreeze in the amp rad to whatever temp you want, maybe -10 or something. To avoid condensation, make the case out of acrylic or another sealable container and place silicate in the case to remove moisture. One could use simple plumbing tubing for the hot water and mount the other rad remotely to keep the heat out in the summer and the reverse the fan for winter. I am making a hot water heater from my F4 monos a couple TEC. The TEC is for my air chiller. TEC cooloing is very inefficient, but the wasted heat aid the F4's in hot water duties. The F4 will be used a lot more during the monsoon because we will be indoors more and the TEC should be on less due to cooler temeratures, so it should balance nicely.
I don't know why more people are not cooling their class A amps with remote cooling. In Canada it makes complete sense. You can fish a 1/2" water line easier than a heavy wire and people do that for their amps. Think, save money on heat in the winter, save double that on A/C in the summer.
I don't know why more people are not cooling their class A amps with remote cooling. In Canada it makes complete sense. You can fish a 1/2" water line easier than a heavy wire and people do that for their amps. Think, save money on heat in the winter, save double that on A/C in the summer.
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cooling
A few issues back Maximum PC had an article on an oil-immersed PC.
http://www.maximumpc.com/article/features/hardcorepc_reactor
A few issues back Maximum PC had an article on an oil-immersed PC.
http://www.maximumpc.com/article/features/hardcorepc_reactor
I do not expect to have to cool them as such. The prototype
pieces have cases running around 45 deg C, which is plenty
cool enough.
🙂
pieces have cases running around 45 deg C, which is plenty
cool enough.
🙂
Oh man, I killed the thread...
I can't wait for this audio equivalent of ENIAC. Will the boards be a PassDIY offering?
I can't wait for this audio equivalent of ENIAC. Will the boards be a PassDIY offering?
An externally hosted image should be here but it was not working when we last tested it.
This ? a project by Jan Meier on Headwize
35W with opamps...
Recently I was thinking hundred times, "Am I crazy, or not?", before bolted 11 of TO-92 devices between copper strips, to get a current mirror. 😀
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