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Old 5th October 2012, 10:53 AM   #7481
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Alfred, i have read your instructions. I like it a lot.
I will read the offset part again and may do some additions i talked about.
Also on the matching of the input devices.
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Old 5th October 2012, 10:55 AM   #7482
MiiB is offline MiiB  Denmark
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The buffer off set can be adjusted with the resistor. with the SK170 and 5 ohm it is app 60-70 mV.. with 11 ohms it practically Nill... (8,5 mA through the Jfet)

Last edited by MiiB; 5th October 2012 at 11:01 AM.
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Old 5th October 2012, 07:37 PM   #7483
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by MiiB View Post
The buffer off set can be adjusted with the resistor. with the SK170 and 5 ohm it is app 60-70 mV.. with 11 ohms it practically Nill... (8,5 mA through the Jfet)
Thank you Miib... precious info
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Old 5th October 2012, 09:36 PM   #7484
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Hi. Since the official R3 PCB was no longer available, I did my own
I also did a pcb for the pre-reg according to the included schematic. I should have them built by the end of the day.
The latest version of the parts list match these PCB.
Attached Images
File Type: jpg Paradise_R3_SB-version.jpg (212.0 KB, 398 views)
File Type: jpg Paradise_Pre-Reg_SB-version.jpg (104.6 KB, 375 views)
File Type: jpg Paradise MainsFilterTransRect.JPG (158.8 KB, 431 views)
Attached Files
File Type: zip Paradise_Parts_List_small.zip (11.5 KB, 45 views)

Last edited by Algar_emi; 5th October 2012 at 09:40 PM.
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Old 5th October 2012, 09:45 PM   #7485
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Question about the BC327/337 HFE matching. Is it necessary to match all the transistor one one channel pcb, or just the Gain Cell ones (Q2,25,26,29 and Q1,30,31,32). And finally, I guest it is necessary to match both channel together as well to get the same gain?

Thanks.
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Old 5th October 2012, 09:55 PM   #7486
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yep the input devices.
also it would be good to match the current mirror (not the one on the servo) for best performance.
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Old 5th October 2012, 10:09 PM   #7487
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Quote:
Originally Posted by Algar_emi View Post
Question about the BC327/337 HFE matching. Is it necessary to match all the transistor one one channel pcb, or just the Gain Cell ones (Q2,25,26,29 and Q1,30,31,32). And finally, I guest it is necessary to match both channel together as well to get the same gain?

Thanks.
Hesener Put this mach beter way in the guide.
Paradise Builders

Se post 13

Match 10% or better pick closest matched and fit in groups as in circuit
Imput Current mirrors and soon
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Old 5th October 2012, 10:17 PM   #7488
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Cool, we have a PCB for the prereg.
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Old 5th October 2012, 10:23 PM   #7489
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Here the completed PCB. Do we need a GB for the Pre-Reg PCB
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File Type: jpg Both_PCB.JPG (267.4 KB, 359 views)
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Old 5th October 2012, 11:40 PM   #7490
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Well, i was designing a prereg too that could lead to a group buy. That is obsolete now.
I would like to try your PCB and add chokes and output caps eventually.
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