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-   -   Class A/B folded cascode amp (http://www.diyaudio.com/forums/solid-state/102433-class-b-folded-cascode-amp.html)

roender 24th May 2007 01:37 PM

Class A/B folded cascode amp
 
2 Attachment(s)
This is the best sounding amplifier I'v ever constructed!
It don't measure very well but it sound so gooood :D

Leolabs 25th May 2007 02:36 AM

Do the small signal transistors have to be matched???

roender 25th May 2007 06:39 AM

Hi Leo,

You must match the following transistors:
J1-J2, BL version, matched at 6mA Ids
Q16-Q14, matched for Vbe
Q19-Q20, it is not really necessary but it's a good thing to do it at the same hfe
Q7-Q6-Q15, matched for hfe

Mihai

Samuel Jayaraj 25th May 2007 07:15 AM

Is the voltage for the input stage +-47volts?

roender 25th May 2007 08:06 AM

Input stage is boosted with 8V (regulated) over output stage which have 32V unregulated power supply

darkfenriz 26th May 2007 10:42 AM

Re: Class A/B folded cascode amp
 
Quote:

Originally posted by roender
It don't measure very well but it sound so gooood :D
Don't be so shy.
It probably still measures way better than any gainclone ever built.
Nice one!

lineup 26th May 2007 11:52 AM

Re: Class A/B folded cascode amp
 
2 Attachment(s)
Quote:

Originally posted by roender

This is the best sounding amplifier I'v ever constructed!
It don't measure very well but it sound so gooood :D
.


great amplifier, roender :cool:

what i have in 'your folder' is something about SymaSym
so i think you have built one MikeB amp, before

( lineup has got one special folder for each interesting diyAudio member
in his harddrive.
Example this time:
C:/My Documents/diyAudio-persons/roender/070127a_powerstage.jpg
See my attachment below
for this powerstage from 27th of January )

If I have a 'NelsonPass' folder ?
Of course, I have!!!!! :cool:
... and you may guess it has got plenty of stuff ... as Nelson IS a very interesting diyAudio profile
C:/My Documents/diyAudio-persons/NelsonPass/



Regards
lineup
:)
... will be back with one more post, lineup comment,
after studying this Folded Cascode amp a bit more

Khron 26th May 2007 03:21 PM

Greetings, mr roender

I sent you an email about 2 weeks ago, through diyaudio. Have you received it?

bogdan_borko 26th May 2007 04:04 PM

any photos??

roender 27th May 2007 05:24 PM

Quote:

Originally posted by Khron
Greetings, mr roender

I sent you an email about 2 weeks ago, through diyaudio. Have you received it?

No, sorry.
If you want, make your whish public ...

Mihai


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