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Old 10th May 2011, 03:17 AM   #10611
flg is offline flg  United States
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Ya know, I havent really even looked at the data sheet and I should have or you'ld have reason to respond with more why's and where'for's... trying them for a drop in replacement might not be the ticket either?
The capacitance thing is important. So let's see Are these EUVL's choice for a reg xister on the F5-X? I didn't get to involvled there. My choice typially would be FQA28N15 I think. For a cascode too. Maybe not a cascode for that toshiba? I don't think I have a compliment so that might be moot?
There are alot of parameters that may or may not mean you have a good xistor for audio. Listening and taking Papa's EUVL and ZM's advice will get you there sooner.
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Old 10th May 2011, 03:26 AM   #10612
tinitus is offline tinitus  Europe
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Originally Posted by flg View Post
I don't think I have a compliment so that might be moot?
how about this one ?

http://media.digikey.com/pdf/Data%20...s/FQA17P10.pdf
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Old 10th May 2011, 04:12 AM   #10613
flg is offline flg  United States
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I would think I want to match Vgsth and transconductance first. Then maybe the Cs. The C curves don't all look the same shape either. Probably something higher current than the FQA17P10. Might be good to have Rthj in a similar area. Just my 2 cents though
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Last edited by flg; 10th May 2011 at 04:18 AM.
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Old 10th May 2011, 04:57 PM   #10614
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While here help pretty please

Opinions on FQP19N20C
This is TO 220
I would really appreciate same advice.
Is same spec as FQA19N20C?

What sort of watt out of it compared to each other?

Tanks


Holco MFR 15ppm 2W for sale

Last edited by Bksabath; 10th May 2011 at 05:00 PM.
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Old 10th May 2011, 05:14 PM   #10615
PB2 is offline PB2  United States
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Nelson - the simplified schematic looks like a FET-ized version of the Universal Tiger output stage:
Universal Tiger

No offense, not that there is any connection.

How close will the output get to the rails? The voltage gain probably helps in this regard.

What outputs were used in the prototype if you don't mind my asking?

Is there a .pdf for the full design somewhere on the net ... Edit: found it here:
http://www.firstwatt.com/pdf/prod_f5_man.pdf
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Last edited by PB2; 10th May 2011 at 05:28 PM.
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Old 10th May 2011, 05:43 PM   #10616
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by PB2 View Post
........ not that there is any connection.

.......
exactly

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Old 11th May 2011, 07:32 AM   #10617
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Originally Posted by TheAnaesthetist View Post
I finished my F5 today and it is working properly. Adjusted now at 90% of target Iqs for a few days to come and than I will test it again. Sound is already great. I am a happy man!! Thanks Peter Daniel for your pcb's and all your advices, h_a for the matched transistors, Zen Mod's very practical initial testing manual an of course mister Pass for giving us the scheme. Enjoying time started. Here are a few pics.
great looking amp
Hifi2000 case ? Is It 4U 300 - you got right amount of space for a dual mono
I see that you use Amplimo toroids - what are their spec - what Is your bias, any hum from toroids

regards
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Old 11th May 2011, 07:38 AM   #10618
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last question - how hot are heatsinks

Last edited by samoloko; 11th May 2011 at 07:40 AM.
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Old 12th May 2011, 03:03 AM   #10619
cjkpkg is offline cjkpkg  United States
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Default Recontinued my journey for dual output F5

I decided that now since the F4 was done I would go back to the F5 and try the double outputs again.

I went and ordered 4 pairs of 2sk1530 and 2sj201. I also took this opportunity to dust off the briangt psu board since I had to cannibalize the Peter D universal psu board for the f4 due to space constraints.

I stuffed the psu with 2X3X39000uf panasonic TUP caps. Then removed the irf mosfets and replaced them with the toshibas - also added the extra pair to the sinks and p2p'd them into the circuit. Biased to 470mV per fet and dialed in the dc offset.

Played it hard for about an hour tonight and all was well!!!

If my blown 2sk170 in the right channel stays away then I guess I will have to attribute my past issue with this to the irf fets...
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Old 12th May 2011, 10:07 PM   #10620
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How close will the output get to the rails?
A couple of volts. The losses are across the Source resistors and the saturation
voltage of the Mosfets.

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