John Curl's Blowtorch preamplifier part II - Page 9

flg · 2nd July 2009, 03:12 AM

And

flg · 2nd July 2009, 03:15 AM

And

flg · 2nd July 2009, 03:17 AM

Last but a good one...

flg · 2nd July 2009, 03:30 AM

All the above pics were captured on Sept 23rd, 2006.
My filenames were;
PSU_Study_1Blowtorch
PSU_Study_1More accurate ideas
PSU_Study_2 John Curl Wow
PSU_Test1
PSU_Test1Good
in that order.
Hope all this helps

Bonsai · 2nd July 2009, 03:34 AM

flg, another approach is to use an isolated split secondary and to then rectify and regulate each of these secondaries and then to connect the ground of the one supply to the + of the other supply to create a split supply.

The advantage to this is you can stick with LM317's -they are much better than the 337's, and all the associated components are of the same polarity. Its also easier to manage the layout and grounding around the rectifiers and filter caps.

AMVECO do some nice split secondary transformers, but if you can ge t R-core, that's better still.

flg · 2nd July 2009, 03:42 AM

My posted pics were in refrence to the requests for Richard's Schemos from page 23,24,26 possibly, of the original Blowtorch thread. These were the ones I thought worth keeping for future refrence. Just thought I might be able to contribute in some small way for once.

john curl · 2nd July 2009, 05:18 AM

Wow!

janneman · 2nd July 2009, 05:47 AM

John,

On the subject of unobtainium output devices:
Have you ever looked at the lateral mosfets that are sold by Profusion in the UK?

http://www.profusionplc.com/pro/gex/...teral%20mosfet

I have used some of their units to restore older amps where the original mosfets are no longer available. Profusion also supply some of the smaller 'hi-end' outfits that still swear by lateral mosfets like some here

Worth a look-see.

Jan Didden

Audioford · 2nd July 2009, 06:02 AM

flg – Thank You! I appreciate all the help I can get. Now to link the text comments to the schematics. Should be interesting.

john curl · 2nd July 2009, 06:13 AM

Anybody find any complementary mosfet 1A devices in a TO-220 package around that have good matched output Z?

2nd July 2009, 03:30 AM	#84
flg diyAudio Member Join Date: Jul 2005 Location: North East	All the above pics were captured on Sept 23rd, 2006. My filenames were; PSU_Study_1Blowtorch PSU_Study_1More accurate ideas PSU_Study_2 John Curl Wow PSU_Test1 PSU_Test1Good in that order. Hope all this helps __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

2nd July 2009, 03:34 AM	#85
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	flg, another approach is to use an isolated split secondary and to then rectify and regulate each of these secondaries and then to connect the ground of the one supply to the + of the other supply to create a split supply. The advantage to this is you can stick with LM317's -they are much better than the 337's, and all the associated components are of the same polarity. Its also easier to manage the layout and grounding around the rectifiers and filter caps. AMVECO do some nice split secondary transformers, but if you can ge t R-core, that's better still. __________________ bonsai http://www.hifisonix.com/

2nd July 2009, 03:42 AM	#86
flg diyAudio Member Join Date: Jul 2005 Location: North East	My posted pics were in refrence to the requests for Richard's Schemos from page 23,24,26 possibly, of the original Blowtorch thread. These were the ones I thought worth keeping for future refrence. Just thought I might be able to contribute in some small way for once. __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

2nd July 2009, 05:47 AM	#88
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	John, On the subject of unobtainium output devices: Have you ever looked at the lateral mosfets that are sold by Profusion in the UK? http://www.profusionplc.com/pro/gex/...teral%20mosfet I have used some of their units to restore older amps where the original mosfets are no longer available. Profusion also supply some of the smaller 'hi-end' outfits that still swear by lateral mosfets like some here Worth a look-see. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

2nd July 2009, 06:02 AM	#89
Audioford diyAudio Member Join Date: Aug 2006	Much Appreciated! flg – Thank You! I appreciate all the help I can get. Now to link the text comments to the schematics. Should be interesting. __________________ Bruce


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2nd July 2009, 05:18 AM	#87
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Wow!

2nd July 2009, 06:13 AM	#90
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Anybody find any complementary mosfet 1A devices in a TO-220 package around that have good matched output Z?

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