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Old 25th March 2010, 11:52 PM   #101
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Ooooops sorry I will measure R1 & R2.

Thanks
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Old 25th March 2010, 11:52 PM   #102
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Double check that you have not accidentally used a PNP where a NPN should be, or vice versa.
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Old 26th March 2010, 12:48 AM   #103
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Fortunately only do the mistake measuring wrong resistors, now all is ok, I connected the IVY III & adjusted the voltage R13 & R14 to 0,05V

Thank you very for your help.

Now I'm waiting the trimmer 200ohms to setup mine other Placis for the BII (I received 2 trimmers 10K instead one1 10K & one 200 ohms) but don't worry Brian knows because I & send him an e-mail & he answered that will send me the trimmer.
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Old 26th March 2010, 12:54 AM   #104
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Very glad to help.
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Old 26th March 2010, 06:37 AM   #105
slam is offline slam  United States
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Hi Russ,

I received IVY/III along with Buffalo II and am current building them. One thing I notice is that the following is R13-R16 (180 Ohms 0.1%) are missing from the IVY/III package. What would be the best way to initiate the process of getting the missing parts?

Thanks,

Stanley
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Old 28th March 2010, 04:00 AM   #106
slam is offline slam  United States
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Quote:
Originally Posted by slam View Post
Hi Russ,

I received IVY/III along with Buffalo II and am current building them. One thing I notice is that the following is R13-R16 (180 Ohms 0.1%) are missing from the IVY/III package. What would be the best way to initiate the process of getting the missing parts?

Thanks,

Stanley
Brian have taken care of me offline. Thanks you guys for the great work and great support!



Stanley
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Old 12th April 2010, 08:00 PM   #107
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Which is the better way with one transformer?
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File Type: jpg placid_bp_2_1_2_assembled.jpg (67.7 KB, 533 views)
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Old 12th April 2010, 08:11 PM   #108
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Originally Posted by prooptiki View Post
Which is the better way with one transformer?
I would use the first, although you cannot wire it the way you have it.

You could do the second option, but I think it's probably a waste of time, but don't let me stop you.
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Last edited by BrianDonegan; 12th April 2010 at 08:17 PM. Reason: Wrong
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Old 16th April 2010, 01:39 PM   #109
alboran is offline alboran  Italy
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hello
I would ask help, before making trouble ...
tensions (+5.50 ve +15 v - 15v), the two power supply, the buffalo dac II and to the Ivy III, I have to adjust.... with the DAC and IVY III connected or disconnected?
I noticed that if you adjust the voltage to +15 V and-15V without load, then when I connect the IVY III, the voltage drops to approximately +9 V .... Is this normal?
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Old 25th April 2010, 05:51 PM   #110
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Hi all, Brian, Russ,

Finally got my Placid BP (v2.1.1) up and running. It sat for quite a while due to other home and family projects...
Had some issues. First I thought I had burned up one of the opamps. Seems that may not have been it.

First thing I noticed was that I couldn't get the voltage above ~ 11V from the + rail. (the - rail was fine all along) I think part of this was a cold solder on QP1 and QP2.

Then I got that worked out, but couldn't get the current across R17 > 100mA. I Pulled my hair out for a bit, then discovered the threads on TP site about the varying Idss on the JFETs that were sent out.
Getting 0.25V across R17 - Placid Dual Power Supply - Twisted Pear Audio Support

jumpering R6 got me to a normal range, so I was happy. I only need about 80mA anyway, so in the end I left R6 as is. Now that I know everything is OK.
After some changes in plans, it's "only" powering a ballsie. Sounds great so far!

Note about cold solder:
I used to be able to solder. Got out of practice. Now that I have a proper temp adjustable station I'm even worse. I also finally got a proper range of tips. The small tip that came with the station was definitely making it hard for me to get some of the larger PCB traces warmed up At least I'm getting some practice again

Last edited by eclectic2k; 25th April 2010 at 05:56 PM. Reason: note version
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