Placid-BP Bipolar Shunt Regulated Power Supply - Page 19 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Twisted Pear

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 3rd October 2013, 05:41 PM   #181
avr300 is offline avr300  Denmark
diyAudio Member
 
avr300's Avatar
 
Join Date: Sep 2005
Location: DK
Measure between tp_out+ and tp_shunt+
Do the same between tp_out- and tp_shunt-

Post the result.
  Reply With Quote
Old 3rd October 2013, 11:46 PM   #182
diyAudio Member
 
nvduybom's Avatar
 
Join Date: Aug 2009
Location: Da Nang, Viet Nam
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.
__________________
http://www.vnav.vn/forum

Last edited by nvduybom; 3rd October 2013 at 11:52 PM.
  Reply With Quote
Old 4th October 2013, 06:06 AM   #183
avr300 is offline avr300  Denmark
diyAudio Member
 
avr300's Avatar
 
Join Date: Sep 2005
Location: DK
What happen when you turn the current limiting potentiometer(s).
  Reply With Quote
Old 4th October 2013, 07:10 AM   #184
diyAudio Member
 
nvduybom's Avatar
 
Join Date: Aug 2009
Location: Da Nang, Viet Nam
I am try to change the current load by VR1A, but VDC of TP_VIN = TP_CCS+ , no current load on R1A .
__________________
http://www.vnav.vn/forum
  Reply With Quote
Old 4th October 2013, 12:47 PM   #185
avr300 is offline avr300  Denmark
diyAudio Member
 
avr300's Avatar
 
Join Date: Sep 2005
Location: DK
Lets move this to the support site at

Twisted Pear Audio Support

Go create a case, I'll help you there.
  Reply With Quote
Old 6th October 2013, 07:28 AM   #186
diyAudio Member
 
nvduybom's Avatar
 
Join Date: Aug 2009
Location: Da Nang, Viet Nam
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 .
__________________
http://www.vnav.vn/forum
  Reply With Quote
Old 3rd November 2013, 11:31 PM   #187
diyAudio Member
 
Join Date: Mar 2013
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 12:43 AM.
  Reply With Quote
Old 26th November 2013, 04:28 PM   #188
diyAudio Member
 
Join Date: Jul 2010
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
  Reply With Quote
Old 5th December 2013, 06:07 PM   #189
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
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.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 11th December 2013, 11:56 PM   #190
diyAudio Member
 
Join Date: Oct 2004
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shunt-regulated 24V DC Power Supply for Preamp Modules snoopyma Power Supplies 31 16th January 2010 03:05 PM
Bipolar Power supply IC argonrepublic Parts 1 6th December 2008 07:24 PM
Regulated Power Supply. Bipolar, JFET or MOS? Kenneth Zhu Tubes / Valves 4 30th December 2007 08:30 AM
Shunt-regulated 24V DC Power Supply for Preamp Modules snoopyma Solid State 0 25th August 2005 04:58 PM
power supply: shunt or series?? AudioGeek Solid State 34 25th July 2004 02:02 AM


New To Site? Need Help?

All times are GMT. The time now is 10:39 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2