John Curl's Blowtorch preamplifier part II - Page 9 - diyAudio
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Old 2nd July 2009, 04:12 AM   #81
flg is offline flg  United States
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And
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File Type: jpg psu_study_2 john curl wow.jpg (38.8 KB, 1612 views)
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Old 2nd July 2009, 04:15 AM   #82
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Old 2nd July 2009, 04:17 AM   #83
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Last but a good one...
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File Type: jpg psu_test1good.jpg (37.6 KB, 1578 views)
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Old 2nd July 2009, 04:30 AM   #84
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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
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Old 2nd July 2009, 04:34 AM   #85
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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.
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Old 2nd July 2009, 04:42 AM   #86
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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.
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Old 2nd July 2009, 06:18 AM   #87
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Wow!
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Old 2nd July 2009, 06:47 AM   #88
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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
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Old 2nd July 2009, 07:02 AM   #89
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Wink 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.
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Old 2nd July 2009, 07:13 AM   #90
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Anybody find any complementary mosfet 1A devices in a TO-220 package around that have good matched output Z?
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