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Old 3rd October 2013, 06:41 PM   #181
avr300 is offline avr300  Denmark
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Measure between tp_out+ and tp_shunt+
Do the same between tp_out- and tp_shunt-

Post the result.
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Old 4th October 2013, 12:46 AM   #182
nvduybom is offline nvduybom  Viet Nam
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Thank avr300, with 10VAC input I measured gnd - tp_out += 12.9vdc, gnd - tp_shunt+= 12.9vdc, tp_out- and tp_shunt- is the same . No current load on R2A and R2B.
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Old 4th October 2013, 07:06 AM   #183
avr300 is offline avr300  Denmark
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What happen when you turn the current limiting potentiometer(s).
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Old 4th October 2013, 08:10 AM   #184
nvduybom is offline nvduybom  Viet Nam
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I am try to change the current load by VR1A, but VDC of TP_VIN = TP_CCS+ , no current load on R1A .
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Old 4th October 2013, 01:47 PM   #185
avr300 is offline avr300  Denmark
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Lets move this to the support site at

Twisted Pear Audio Support

Go create a case, I'll help you there.
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Old 6th October 2013, 08:28 AM   #186
nvduybom is offline nvduybom  Viet Nam
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Great thank avr300, the problem was solved by my friend, the cause by VR2A, but I don't know why the line negative fail, same .

About the case vol dc down 15 VDC to 1 VDC by I mistake GND with - when connect to Legato.

Now, my board work well .
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Old 4th November 2013, 12:31 AM   #187
picovolt is offline picovolt
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Default HD problems, new build, no adjustment at VR2

Built HD and HD PBP at the same time; just tested them. BP is working just as expected, but the HD is not working correctly. All LEDs lit, checked all 550 and 560 transistors (for orientation and solder joints), resistors, solder joints on everything. Twice.

These are most basic measurements, and I can provide photos and more measurements as required.

V in 10.85V AC
DC in 13.45V (TP GND1 & TP VIN)
V out is about 4.05 cold, then lowers to 3.9ish; turning VR2 has no effect at all on V out.
TP V REF is 3.87V which is correct I think.
CSS measures 0.00

Any suggestions where to look?

Edit: cross-posted here:http://www.twistedpearaudio.com/foru...aspx#post20135

Last edited by BrianDonegan; 4th November 2013 at 01:43 AM.
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Old 26th November 2013, 05:28 PM   #188
orangeart is offline orangeart  United Kingdom
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I have an application where I need 35-37 volts out, I have a spare placid, can it be modded to take out put this kind of voltage and if so how much head room would it need?

Stefan
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Old 5th December 2013, 07:07 PM   #189
Russ White is offline Russ White  United States
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Not to discourage you, but I would not recommend it unless you understand the circuit well enough to make the changes yourself. If it not the HD version it is not really possible with serious rework.
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Old 12th December 2013, 12:56 AM   #190
pixelpusher is offline pixelpusher  United States
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Quote:
Originally Posted by picovolt View Post
Built HD and HD PBP at the same time; just tested them. BP is working just as expected, but the HD is not working correctly. All LEDs lit, checked all 550 and 560 transistors (for orientation and solder joints), resistors, solder joints on everything. Twice.

These are most basic measurements, and I can provide photos and more measurements as required.

V in 10.85V AC
DC in 13.45V (TP GND1 & TP VIN)
V out is about 4.05 cold, then lowers to 3.9ish; turning VR2 has no effect at all on V out.
TP V REF is 3.87V which is correct I think.
CSS measures 0.00

Any suggestions where to look?
Look at your soldering. I recently had the same issue. I checked, double and triple checked my soldering and could not find fault. I reflowed the solder three times and checked it under magnification. I finally sucked all that solder off. It was some boutique "audiophile" solder that a friend gave me. I re-soldered all parts with my good old eutectic solder and no problems now.
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