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Old 23rd May 2009, 10:45 PM   #3771
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Hi Nelson
I am not sure if you missed my post about the quasi-complementary output stage or if it is difficult to do, but anyway I have raised the stakes.
The first person that can produce a working quasi-complimentary output stage for this circuit gets a free packet of Tim Tams.
Just in case you guys don't know what Tim Tams are, they are the best tasting biscuits/cookies in the world that you can buy from the supermarket.
Edit: Made in Australia of course
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Old 23rd May 2009, 11:12 PM   #3772
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I fear you'll have to eat all your biscuits.
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Old 24th May 2009, 12:04 AM   #3773
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Quote:
Originally posted by thanh1973
Hi Nelson
I am not sure if you missed my post about the quasi-complementary output stage or if it is difficult to do, but anyway I have raised the stakes.
The first person that can produce a working quasi-complimentary output stage for this circuit gets a free packet of Tim Tams.
Just in case you guys don't know what Tim Tams are, they are the best tasting biscuits/cookies in the world that you can buy from the supermarket.
Edit: Made in Australia of course

look for Papa's Mosfet Citation pdf ( somewhere on Passdiy or Passlabs )

everything you need is there
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Old 24th May 2009, 12:22 AM   #3774
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Thanks for the info Zen Mod.
I'll have a look at this and see if I can do it myself.
The offer still applies though. Tim Tams for the first person who comes up with a working version of the F5 with quasi-complimentary output stage.
So now it is also competition to see if anyone can beat me to it.

EDIT: I can't access the pass site. It must be down temporarily
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Old 24th May 2009, 12:30 AM   #3775
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Quote:
Originally posted by thanh1973
Thanks for the info Zen Mod.
I'll have a look at this and see if I can do it myself.
The offer still applies though. Tim Tams for the first person who comes up with a working version of the F5 with quasi-complimentary output stage.
So now it is also competition to see if anyone can beat me to it.

l' art pou l' art ?

why you want this ?

to spoil it's elegancy ?

replicate tube SRPP , ad Jfet input , and you're there

or White Cascode ..... or anything with tube

edit :

I think that you can disregard my Citation idea ...... I just mixed things .... threads .... whatever I mixed .........

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Old 24th May 2009, 12:54 AM   #3776
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Well I have never heard a quasi-comp design I didn't like the sound of.
So I was curious how this might change the sound of this amp.
I am not suggesting the F5 does'nt sound any good.
Not at all, I would just like to try different things and see what the effect might be.
I suppose I have a gut feeling I would very much like the end result.
I am fairly new to this hobby (therefore lack a lot of the technical ability to do this myself) I am also married with a baby, so time is extremely limited.
I should have studied physics at university and not materials science, and I should have started this hobby when I was young and single.
Oh Well, better late than never.
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Old 24th May 2009, 05:08 AM   #3777
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Default 50W for F5

Is there anyway to MOD F5 for 50W ?

Thanks
Anadigit
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Old 24th May 2009, 05:11 AM   #3778
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I would think you could just parrallel the out put devices, Similar to what is done on the BA-1 (ie Nelson's Burning Amp)
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Old 24th May 2009, 06:37 AM   #3779
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An F5 cannot be quasi-complementary outputed. Or it will not be an F5 anymore, stop joking, guys!
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Old 25th May 2009, 04:52 AM   #3780
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Default Heatsink touch-test

I have completed one F5 channel - standard circuit/parts, with point-to-point wiring on breadboards (no pcb).

After successful adjustment to specified voltages, after one hour warm-up, the heatsink touch-test is giving me 2-3 seconds bearable touch duration at the edge of the heatsink and I really can't go past 4 seconds. This seems just within spec to me. Note the following:
- I am using one aluminum heatsink (unpainted) per device
- ambient temperature is around 26-28 degrees C and relative humidity ranges from 70% to 90% (I'm in Jakarta, not far from the equator).

No need to reply to this post unless someone has warnings or concerns regarding the temperature.

Thanks,
Steve
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