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Old 27th January 2009, 09:57 PM   #2501
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Default Re: f5 pcb

Quote:
Originally posted by umut1001
hi..my friend draw this for me..i wanna build f5 amp to 50cm of heatsink..for good cooling we decided to put the mosfets far eachother..what do you think about this?thanks

Always, always you want the gate stopper resistors mounted as close as possible to the gates of the MOSFETs.
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Old 27th January 2009, 10:31 PM   #2502
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yes true.. i know shorter is better but for better cooling mosfets must be far eachother..its dilemma.i dont know what to do..
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Old 27th January 2009, 10:34 PM   #2503
Magura is offline Magura  Denmark
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Quote:
Originally posted by umut1001
yes true.. i know shorter is better but for better cooling mosfets must be far eachother..its dilemma.i dont know what to do..

Copper just might do the trick for you.



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Old 27th January 2009, 10:39 PM   #2504
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sorry but i didnt understand
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Old 27th January 2009, 10:57 PM   #2505
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by umut1001
sorry but i didnt understand

heatspreader made of copper
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Old 27th January 2009, 11:08 PM   #2506
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ow i see..but its expensive and non findable here maybe i can find but i need to look for it
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Old 27th January 2009, 11:10 PM   #2507
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Quote:
Originally posted by umut1001
yes true.. i know shorter is better but for better cooling mosfets must be far eachother..its dilemma.i dont know what to do..

It really isn't an option -- if the distance from the resistor to the MOSFET gate is too long the device can break into oscillation.
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Old 27th January 2009, 11:32 PM   #2508
JimT is offline JimT  Canada
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You could solder it directly to the pin of the Mosfet.

Jim
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Old 27th January 2009, 11:47 PM   #2509
labjr is offline labjr  United States
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If the MOSFETs are connected by wires, would it be better to solder the wires than use connectors ?
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Old 28th January 2009, 12:45 AM   #2510
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Thought I'd post another few pics. I sprayed my chassis tonight so while the paint was drying I finished another few bits of prep work. There is still a little chassis work to do like feet and the front panel. However I think the soldering on the boards and PS is just about done.

Click the image to open in full size.

The alu panel was an internal panel inside the case I am using for the amp. Made it very handy to mount the transformers.

Click the image to open in full size.

I amp going dual mono with this one so hopefully it will pay dividends. More I do the more I believe that the PS is critical to nearly everything. Just as important as the "circuit".

Like mentioned above, I am mounting the mosfets directly to the heatsinks and running some wire back to the PCB. Hope it will work out ok. The wires are about 3-4" long, will probably be a bit shorter when I mount properly to the PCB on the chassis.

Click the image to open in full size.

If anyone sees anything wrong in all this, let me know!!!!


Fran
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