Chip Amp Photo Gallery - Page 229

6L6 · 4th December 2012, 12:19 PM

PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed.

lanchile · 4th December 2012, 11:56 PM

Quote:

Originally Posted by 6L6

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:

Einric · 5th December 2012, 12:14 AM

Here are the schematics for the P/S and the Amp.
Hopefully this sheds a little light on the subject.

Einric · 5th December 2012, 12:19 AM

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.

6L6 · 5th December 2012, 12:22 AM

Quote:

Originally Posted by Einric

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.

danzrose · 5th December 2012, 03:04 AM

My LM1875 Amp with simple PSU

benb · 5th December 2012, 03:57 AM

Quote:

Originally Posted by 6L6

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?

Einric · 5th December 2012, 04:33 AM

@ Dan where are your little chips hiding?

6L6 · 5th December 2012, 05:09 AM

Quote:

Originally Posted by benb

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!

AndrewT · 5th December 2012, 04:33 PM

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.

4th December 2012, 12:19 PM	#2281
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	PG+ and PG- are connected at the amp PCB. It's how the circuit board is designed. __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4

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5th December 2012, 12:19 AM	#2284
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	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.

5th December 2012, 04:33 AM	#2288
Einric diyAudio Member Join Date: Feb 2011 Location: Bozeman, MT	@ Dan where are your little chips hiding?

5th December 2012, 04:33 PM	#2290
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.