My AB amp inspired by AlephX

[DarkOne]

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.

[DarkOne]

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.

[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 !

[DarkOne]

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.

[LBHajdu]

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

[pinkmouse]

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.

[DarkOne]

Sorry, I thought that it will work. Tomorrow I'll post complete schematic with values in pdf format. Stay tuned

[LBHajdu]

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

[mpmarino]

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...

[thanh]

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 !