Single ended classA with dual supply rails

boxedin · 10th January 2006, 10:01 AM

hi all,

Is there a schematic for single ended Class A with dual supply rails?.

Let me know.

Thanks
Alexk

Netlist · 10th January 2006, 10:11 AM

One of the most popular is the AlephX. You really have to come over to passlabs forum.

/Hugo

pinkmouse · 10th January 2006, 10:17 AM

Or stay here and look at the Krell Clone thread. It's not single ended but it is a cracking amp.

Hornlover · 10th January 2006, 06:41 PM

How much power are you talking about? The original JLH design was redesigned about 1996 for dual supplies, as well as Rod Elliots versions. And then, there are the versions at Nelson Pass's DIY site.
Check 'em out.

http://www.tcaas.btinternet.co.uk/index-1.htm

http://sound.westhost.com/projects-1.htm

http://www.passdiy.com/default.htm

gl · 10th January 2006, 07:31 PM

And let's not forget the Alephs on the passlabs site.

Graeme

boxedin · 10th January 2006, 07:34 PM

I forgot to metion i need a circuit based on bjt single ended with dual power supply rails.

PAsslabs are FET based.

mlloyd1 · 10th January 2006, 07:37 PM

on one of the passlabs sites is a project from 1977 that sounds like it matches your needs. it's an project from the now defunct "Audio" magazine. the entire article is available as a pdf.

mlloyd1

edit: i found the link:
link to single ended class a amp

Quote:

Originally posted by boxedin
I forgot to metion i need a circuit based on bjt single ended with dual power supply rails.

PAsslabs are FET based.

gl · 10th January 2006, 07:39 PM

How about the A25 on the passdiy site then.

Graeme

boxedin · 11th January 2006, 09:42 PM

That is diffrential input stage not single ended. :@

It seems like no one has buit an single ended class A amp with dual rails without feedback.

gl · 11th January 2006, 10:02 PM

Hi boxedin,

In my view, a single ended amplifier refers to the output stage. I realize that others may hold a differing view.

I consider the A25 to be a single ended class-A BJT amplifier. I can't think of another recommendation offhand but there must be one.

I think you may have to design up something for yourself. How about grafting the front end of the JLH onto the output stage of the A25?

Regards,
Graeme

10th January 2006, 10:01 AM	#1
boxedin diyAudio Member Join Date: Dec 2005 Location: canada	Single ended classA with dual supply rails hi all, Is there a schematic for single ended Class A with dual supply rails?. Let me know. Thanks Alexk __________________ Don't read too much into my circuits unless i specify its final circuit. It is work in progress.

10th January 2006, 10:17 AM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Or stay here and look at the Krell Clone thread. It's not single ended but it is a cracking amp. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

10th January 2006, 07:34 PM	#6
boxedin diyAudio Member Join Date: Dec 2005 Location: canada	I forgot to metion i need a circuit based on bjt single ended with dual power supply rails. PAsslabs are FET based. __________________ Don't read too much into my circuits unless i specify its final circuit. It is work in progress.

11th January 2006, 09:42 PM	#9
boxedin diyAudio Member Join Date: Dec 2005 Location: canada	That is diffrential input stage not single ended. :@ It seems like no one has buit an single ended class A amp with dual rails without feedback. __________________ Don't read too much into my circuits unless i specify its final circuit. It is work in progress.

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10th January 2006, 10:11 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	One of the most popular is the AlephX. You really have to come over to passlabs forum. /Hugo

10th January 2006, 06:41 PM	#4
Hornlover diyAudio Member Join Date: Sep 2004 Location: Central California	How much power are you talking about? The original JLH design was redesigned about 1996 for dual supplies, as well as Rod Elliots versions. And then, there are the versions at Nelson Pass's DIY site. Check 'em out. http://www.tcaas.btinternet.co.uk/index-1.htm http://sound.westhost.com/projects-1.htm http://www.passdiy.com/default.htm

10th January 2006, 07:31 PM	#5
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	And let's not forget the Alephs on the passlabs site. Graeme

10th January 2006, 07:39 PM	#8
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	How about the A25 on the passdiy site then. Graeme

11th January 2006, 10:02 PM	#10
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	Hi boxedin, In my view, a single ended amplifier refers to the output stage. I realize that others may hold a differing view. I consider the A25 to be a single ended class-A BJT amplifier. I can't think of another recommendation offhand but there must be one. I think you may have to design up something for yourself. How about grafting the front end of the JLH onto the output stage of the A25? Regards, Graeme

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