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Old 19th June 2010, 08:52 AM   #21
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Quote:
Originally Posted by wahab View Post
well, it s doable if one is satisfied with a THD ratio that
is ten fold higher than when adding an EF buffer stage....

Charts will tell maybe
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Old 19th June 2010, 09:33 AM   #22
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Please do not measure THD at 1kHz, measure, please THD at 100kHz. Many transistors does a very slow amplifier.
Okay, here you are. Would you kindly show your THD measurement at 100kHz.
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Old 19th June 2010, 11:42 AM   #23
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OI OI OI

I think we need to remember that when driving even a single pair of VERTICLE FETS, we need a fair wack of current across their gate to keep them stable. They need to be driven tightly! 10 Pairs - This needs to be thought about carefully! HF Distortion will be up the shoot... I reckon an MJE350/340 will do the driving nicely! Better yet, MJE15032/33.

Nice Layout though - 5*s


On the front of cooling... In one lot of amplifiers I designed, we ended up with 2 x 2000W RMS in a 2U package, so needless to say we needed to get rid of a lot of heat! Two things emerged from months of idea's... Increase the number of output devices - ie use way more than you need, which as we all know will drop the total heat dissapation dramatically, and number 2 : We got a car radiator company to build a run of mini radiators. these fitted in a 2U case and were very efficient at cooling. The answer is to have a very thick piece of material for the output devices to mount onto. 4 x 80mm fans attached to each "heat sink" for forced cooling. These were mounted against the sides of the case, an blew he hot air out, sideways. Just about the entirety of the side panels were vents, to obtain as much free flow as possible.

It did the job in around 300 touring amplifiers.

Last edited by Coastben; 19th June 2010 at 11:45 AM.
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Old 19th June 2010, 11:45 AM   #24
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Quote:
Originally Posted by Coastben View Post
On the front of cooling... In the lat lot of amplifiers I designed, we ended up with 2 x 2000W RMS in a 2U package, so needless to say we needed to get rid of a lot of heat! Two things emerged from months of idea's... Increase the number of output devices - ie use way more than you need, which as we all know will drop the total heat dissapation dramatically, and number 2 : We got a car radiator company to build a run of mini radiators. these fitted in a 2U case and were very efficient at cooling. The answer is to have a very thick piece of material for the output devices to mount onto. 4 x 80mm fans attached to each "heat sink" for forced cooling. These were mounted against the sides of the case, an blew he hot air out, sideways. Just about the entirety of the side panels were vents, to obtain as much free flow as possible.

It did the job in around 300 touring amplifiers.
Similar to ARX amplifiers from austrailia?
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Old 19th June 2010, 11:50 AM   #25
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Not sure about that, as I have not seen them yet... I was in South Africa at the time.

I know that the crown CSL range had something similar going on with an aluminium heatsink with really thin fins, and air being forced out through the side of the case. The ones we build looked exactly like a radiator, however, the company who made the cooling units advised that copper was more efficient because of the space constraint.
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Old 19th June 2010, 11:54 AM   #26
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Have a look, they also use radiator fins.
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Old 19th June 2010, 11:55 AM   #27
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Yep... Something Like That! :-)
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Old 19th June 2010, 11:57 AM   #28
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Quote:
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Yep... Something Like That! :-)
Seems like many followed this scheme
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Old 19th June 2010, 12:01 PM   #29
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Got to love how the PCB has been cut around the Toroid....:-) You would want to make sure your design was right the first time.


I still think that a radiator style cooling device is the go if you are trying to get rid of loads of heat quickly. The only limit is how tightly they can pack the foils between the plates, and how many high velocity fans you can attach to it!
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Old 19th June 2010, 12:13 PM   #30
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