LM317 CCS Zen Style amp

van garderen · 11th March 2007, 09:02 AM

LM317 Reg IC CCS for Zen Style amp I have not found on the web. I built a simple version and was pleased with the result. However, I do not have any test gear so I do not know its performance. I would aprreciate comments and obvious improvements if this concept is viable for low power Zen style amps. I take no credit for the circuit as its a combination of web circuits. Also my knowledge is limited, but its fun to experiment.

Netlist · 11th March 2007, 09:14 AM

John,
Welcome.

A better picture would certainly help. If you can't do that, mail me the hi-res version and I'll post it.

hugorx and hotmail.

/Hugo

Nordic · 11th March 2007, 10:10 AM

I assume it is down these lines...

http://www.tubecad.com/articles_2001...srr/page2.html

Class A buffer using LM317 3 terminal reg's

Should be quite a diffirence between brands, I noticed the other night, swapping out lm317's (looking for matched sets) I noticed that the voltage produced, with nothing else changed, varied in bands between manufacturers....

van garderen · 11th March 2007, 10:38 AM

Maybe this picture will come out larger?

Nordic · 11th March 2007, 02:45 PM

It certainly seems pretty linear as far as current delivery goes, I would wonder about the frequency response though, I used it as a CSS to drive the heater in a few of the Multi hybrids I tried.

http://66.249.93.104/translate_c?hl=...language_tools

van garderen · 12th March 2007, 07:43 AM

Nordic,
Thanks for informative CCS info. Hybrid Valve/ Mosfet is my next interest after I understand Zen a bit more.

planet10 · 12th March 2007, 08:33 AM

Here is the map after a little image processing...

dave

paulb · 12th March 2007, 11:29 AM

Here's a source follower version from Headwize:
http://headwize.com/images4/tomo_cs1.gif
from the page
http://headwize.com/projects/showpro...e1_add_prj.htm

Nordic · 12th March 2007, 02:44 PM

The hybrid is very close to the zen, basicaly one of those LM317 CCS on the pin to ground wich is then routed trough the heater to provide 150mA ... and on the front is the valve with a small CCS on the positive rail's side...

My next version I plan to keep the Zen output stage, but will add seperate 6V supply for the heater grid, regs are cheap enough.

Realy looking forward to it as my 9V headphone amp is giving me so much delight. and that is just an opamp voltage follower as an output stage.

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11th March 2007, 09:14 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	John, Welcome. A better picture would certainly help. If you can't do that, mail me the hi-res version and I'll post it. hugorx and hotmail. /Hugo

11th March 2007, 10:10 AM	#3
Nordic diyAudio Member Join Date: Sep 2005	I assume it is down these lines... http://www.tubecad.com/articles_2001...srr/page2.html Class A buffer using LM317 3 terminal reg's Should be quite a diffirence between brands, I noticed the other night, swapping out lm317's (looking for matched sets) I noticed that the voltage produced, with nothing else changed, varied in bands between manufacturers....

11th March 2007, 02:45 PM	#5
Nordic diyAudio Member Join Date: Sep 2005	It certainly seems pretty linear as far as current delivery goes, I would wonder about the frequency response though, I used it as a CSS to drive the heater in a few of the Multi hybrids I tried. http://66.249.93.104/translate_c?hl=...language_tools

12th March 2007, 07:43 AM	#6
van garderen diyAudio Member Join Date: Mar 2007	Nordic, Thanks for informative CCS info. Hybrid Valve/ Mosfet is my next interest after I understand Zen a bit more.

12th March 2007, 11:29 AM	#8
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Here's a source follower version from Headwize: http://headwize.com/images4/tomo_cs1.gif from the page http://headwize.com/projects/showpro...e1_add_prj.htm

12th March 2007, 02:44 PM	#9
Nordic diyAudio Member Join Date: Sep 2005	The hybrid is very close to the zen, basicaly one of those LM317 CCS on the pin to ground wich is then routed trough the heater to provide 150mA ... and on the front is the valve with a small CCS on the positive rail's side... My next version I plan to keep the Zen output stage, but will add seperate 6V supply for the heater grid, regs are cheap enough. Realy looking forward to it as my 9V headphone amp is giving me so much delight. and that is just an opamp voltage follower as an output stage.

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