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Old 28th October 2012, 10:25 AM   #81
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I also have some queastions maybe someone knows?

I plan to etch boards by myself how large should i do the traces for the outputstage? at the moment i only have 35m pcbs at home
Or should i look for 70m boards?

And for the outputstage i want to use IRFP240 should be no problem.
But how should they be matched?
Is it ok:
->if the 6 from CCS fits togehther and the 6 from the Gain Stage also fits together?
or is it recommended that all 12 of one channel are matched togehther?

I`m not sure because in my Aleph J clone i used matched Quads so all Transistors of one channel are matched
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Old 29th October 2012, 12:22 AM   #82
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about a 1\4" you can always add solder or solder a wire to the trace for more current.

match the current fets to eachother. and output to eachother.

have fun.
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Old 30th October 2012, 01:14 AM   #83
PKI is offline PKI  United States
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Guys, do i really need a rectifier bridge in safety grnd-to-signal grnd like in F5 turbo psu schematics, or it is redundancy and CL-60 like in F5 is enough?
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Old 30th October 2012, 03:30 AM   #84
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Quote:
Originally Posted by PKI View Post
........CL-60 like in F5 is enough........
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Old 3rd November 2012, 04:08 AM   #85
PKI is offline PKI  United States
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Which is better left(smaller) or right(bigger)? Click the image to open in full size.
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Old 3rd November 2012, 04:11 AM   #86
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Doesn't matter. Use what you have on hand.

If you must go to the store and buy more, I like the smaller ones, but only because of the color. (which might just be the photo...)

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Old 3rd November 2012, 04:14 AM   #87
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I have enough of either of them. Was thinking a big will help to emit some more heat :-)

Hope will start one tomorrow!
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Old 3rd November 2012, 04:21 AM   #88
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The heatsink effect of the bigger washer is negligible - the reason for using fender washers is to make the screw pressure on the top of the transistor case as even as possible, so the transistors are very square and flat to the heatsink surface. That's where the heat transfer takes place - the metal side of the package.
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Old 3rd November 2012, 04:31 AM   #89
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Thanks! Yep, it was kinda joke :-)
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Old 4th November 2012, 02:45 AM   #90
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Just started the psu, it measures +/- 36V with no load.
Click the image to open in full size.
I will be firing up the amp tomorrow, any suggestion? It is not an F5, so not much to tune... Should i just measure dc offset and voltage across source resistors?
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