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Old 25th July 2009, 12:41 PM   #4591
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Default Re: Re: Re: f5 w/Parallel Output IC

Quote:
Originally posted by bobodioulasso


This does not seem to be the case here

http://www.6moons.com/audioreviews/firstwatt7/f5_2.html
I will stick to my story. The gate resistor on the MOSFET should be as close as possible to the output device. I can get my F5's to operate into the MHz without problems (yeah, I know that's an abusrdity).
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Old 25th July 2009, 12:49 PM   #4592
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Default Re: Re: Re: Re: f5 w/Parallel Output IC

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Originally posted by jackinnj

I can get my F5's to operate into the MHz without problems (yeah, I know that's an abusrdity).
No, it's not - since you try to check & proof the stability of your amp!
Cheers,
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Old 25th July 2009, 01:07 PM   #4593
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Default Re: Re: Re: Re: f5 w/Parallel Output IC

Quote:
Originally posted by jackinnj
...The gate resistor on the MOSFET should be as close as possible to the output device...
I totally agree with you but you spoke also about the distance from JFets to this resistor, which doesn't look so important to me.
Though i may be wrong as i did not experiment with this.
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Old 25th July 2009, 01:17 PM   #4594
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I have a run of 0.300 inch (7.6mm) from gate-stopper to mosfet. The F5 layout shown on 6-moons spreads the MOSFET's heat better. Still I have 4 of these guys running -- from mounting hole to mounting hole the spread is 3.800" = 96.5mm and eyeballing the First Watt amp it would appear to be 2x this at least.
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Old 25th July 2009, 01:36 PM   #4595
sangram is offline sangram  India
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Jack, what about the other end? I can probably get within a few millimeters myself on the gate side, but will be difficult on the drain of Q1. There are at least 4 solder connections to be made on that 'track', and this will make it really tough to get better than 15mm or so, maybe a bit more.
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Old 25th July 2009, 03:09 PM   #4596
npapp is offline npapp  United States
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I can definitely get shorter traces from the jfet drain to the g-s resistors if I move the jfet further toward the MOSFETs, but this gives me a much longer input trace from R1 to the jfet source. Should I worry about the input trace length? I was trying to keep it as short as possible.

N
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Old 25th July 2009, 03:30 PM   #4597
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Quote:
Originally posted by npapp
I can definitely get shorter traces from the jfet drain to the g-s resistors if I move the jfet further toward the MOSFETs, but this gives me a much longer input trace from R1 to the jfet source. Should I worry about the input trace length? I was trying to keep it as short as possible.
I wouldn't lose any sleep over it.

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Old 25th July 2009, 06:53 PM   #4598
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Default Single Layout

Could anybody anwer my question from post 4857 ?

This is my first try, single channel layout.

Any comments?
Attached Images
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Old 25th July 2009, 07:14 PM   #4599
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I would try but returning the speakers to psu instead of pcb.
I would insert a serial bulb into the mains for the first run.
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Old 25th July 2009, 07:15 PM   #4600
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Default oops... wrong Number posted

Post #4587 sorry.
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