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Old 4th December 2012, 12:19 PM   #2281
6L6 is online now 6L6  United States
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PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed.
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Old 4th December 2012, 11:56 PM   #2282
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Quote:
Originally Posted by 6L6 View Post
PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed.
Connections from PG- and PG+ go to "power supply caps + and -"... that go to ground!

I am right here? let see the picture here:
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File Type: gif ps-rev3-sch.gif (21.4 KB, 1244 views)
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Old 5th December 2012, 12:14 AM   #2283
Einric is offline Einric  United States
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Default P/S & Amp Schematics

Here are the schematics for the P/S and the Amp.
Hopefully this sheds a little light on the subject.
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File Type: png Amp Schematic.png (47.9 KB, 1230 views)
File Type: png PS Schematic.png (82.9 KB, 1207 views)
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Old 5th December 2012, 12:19 AM   #2284
Einric is offline Einric  United States
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The difference in the two power supplies is that the Audiosector P/S has reversed diode polarity on the AC1 in relation to the AC2.
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Old 5th December 2012, 12:22 AM   #2285
6L6 is online now 6L6  United States
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Quote:
Originally Posted by Einric View Post
The difference in the two power supplies is that the Audiosector P/S has reversed diode polarity on the AC1 in relation to the AC2.
Electrically they are the same. The Audiosector schematic is drawn a bit non-standard.
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Old 5th December 2012, 03:04 AM   #2286
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Default lm1875 "Unyil"

My LM1875 Amp with simple PSU
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File Type: jpg PC040272a.JPG (232.5 KB, 1264 views)
File Type: jpg PC040273a.JPG (33.0 KB, 1144 views)
File Type: jpg PC040274a.JPG (231.7 KB, 612 views)
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Old 5th December 2012, 03:57 AM   #2287
benb is offline benb  United States
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Quote:
Originally Posted by 6L6 View Post
Electrically they are the same. The Audiosector schematic is drawn a bit non-standard.
Look carefully at thr bridges in #2282 - the lower bridge will charge the lower electrolytic with the WRONG polarity.

Is there a policy here about non-photographic discussions in this thread? Should someone start another thread?
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Old 5th December 2012, 04:33 AM   #2288
Einric is offline Einric  United States
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@ Dan where are your little chips hiding?
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Old 5th December 2012, 05:09 AM   #2289
6L6 is online now 6L6  United States
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Originally Posted by benb View Post
Look carefully at thr bridges in #2282 - the lower bridge will charge the lower electrolytic with the WRONG polarity.
Yes, you are absolutely correct! Good catch!
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Old 5th December 2012, 04:33 PM   #2290
AndrewT is offline AndrewT  Scotland
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The Audiosector schematic is correct.
The +ve of the smoothing capacitor in both the upper and the lower halves is connected to the +ve of the bridge rectifier.
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