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Old 10th January 2006, 10:01 AM   #1
boxedin is offline boxedin  Canada
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Default 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
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Old 10th January 2006, 10:11 AM   #2
Netlist is offline Netlist  Belgium
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One of the most popular is the AlephX. You really have to come over to passlabs forum.

/Hugo
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Old 10th January 2006, 10:17 AM   #3
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Or stay here and look at the Krell Clone thread. It's not single ended but it is a cracking amp.
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Old 10th January 2006, 06:41 PM   #4
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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
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Old 10th January 2006, 07:31 PM   #5
gl is offline gl  United States
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And let's not forget the Alephs on the passlabs site.

Graeme
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Old 10th January 2006, 07:34 PM   #6
boxedin is offline boxedin  Canada
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I forgot to metion i need a circuit based on bjt single ended with dual power supply rails.

PAsslabs are FET based.
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Old 10th January 2006, 07:37 PM   #7
mlloyd1 is offline mlloyd1  United States
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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.
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Old 10th January 2006, 07:39 PM   #8
gl is offline gl  United States
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How about the A25 on the passdiy site then.

Graeme
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Old 11th January 2006, 09:42 PM   #9
boxedin is offline boxedin  Canada
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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.
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Old 11th January 2006, 10:02 PM   #10
gl is offline gl  United States
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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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