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Old 27th September 2005, 07:53 AM   #11
DarkOne is offline DarkOne  Slovakia
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Quote:
Originally posted by choky


if you send me that files I can put it on my web for (temp) download if someone else is interested...
Thanks

I will update the previously posted schematic with component values, then I'll update this thread. Before that, anybody interested can send me an email for values.
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Old 27th September 2005, 08:19 AM   #12
DarkOne is offline DarkOne  Slovakia
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Quote:
Originally posted by LBHajdu
Here is another option, taken from half of a Pass A75 and Xed. But it may have too many stages to make the x concept work. The P.S. rejection will be better.

I’m really ashamed of this drawing. I think I put about ten min. it to it.

Nice amp (I got similar idea). One thing I wanted to avoid in my desigh was use of separate supply for driving circuit and output stage.

I would use 4 resistors to ground around Vgs multiplier to decrease open loop gain and increase linearity. Also I would adjust current from both current sources instead of changing values of drain resistors of diff pair.
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Old 27th September 2005, 02:52 PM   #13
thanh is offline thanh  Viet Nam
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congratulation !
I'm sorry ! Can anyone help me?
A Aleph chanel uses one dual-volume . how can I adjust volume for 2 chanel ? thank you !
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Old 27th September 2005, 04:28 PM   #14
DarkOne is offline DarkOne  Slovakia
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Quote:
Originally posted by thanh
congratulation !
I'm sorry ! Can anyone help me?
A Aleph chanel uses one dual-volume . how can I adjust volume for 2 chanel ? thank you !
You need quad volume pot or digitaly controlled resistor network with relays. You can also mechanicaly connect two dual pots.
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Old 27th September 2005, 08:07 PM   #15
LBHajdu is offline LBHajdu  United States
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I tried downloading the current version of EAGLE (4.15 Light). It could not open the files. I get the error “Load error 290 on file..bla..bla..”. Can it be exported into another format or can a screen image be taken?

Leve
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Old 27th September 2005, 08:12 PM   #16
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If the files can be zipped down to less than 100k they can be attached here, and I'll have a look at them for you.
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Old 27th September 2005, 08:35 PM   #17
DarkOne is offline DarkOne  Slovakia
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Sorry, I thought that it will work. Tomorrow I'll post complete schematic with values in pdf format. Stay tuned
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Old 27th September 2005, 09:30 PM   #18
LBHajdu is offline LBHajdu  United States
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Would it be possible to make the diff pairs out of j-fets. And if so would there be any benefits to doing that? The input impedance would be really high.

Do any of the mosfets making up the diff pairs/ccs have to be mounted for thermal coupling with any other part? This is probably better answered when we have part numbers.

I thought this amp would get a much bigger response, it is the only AB x-amp that that will take a single-ended input. Plus the symmetry is very pleasing to the eye.

Leve
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Old 28th September 2005, 05:16 AM   #19
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Quote:
I thought this amp would get a much bigger response, it is the only AB x-amp that that will take a single-ended input. Plus the symmetry is very pleasing to the eye.
I was thinking the same thing. ESPECIALLY since it got the from N.P. --"looks great, congratulations" and that's it! cool!--

I think it will take off when more info comes along...
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Old 28th September 2005, 07:45 AM   #20
thanh is offline thanh  Viet Nam
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Quote:
quote:
Originally posted by thanh
congratulation !
I'm sorry ! Can anyone help me?
A Aleph chanel uses one dual-volume . how can I adjust volume for 2 chanel ? thank you !

You need quad volume pot or digitaly controlled resistor network with relays. You can also mechanicaly connect two dual pots.
Which volume are you using ? and Pass-lab ?
Thanks you !
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