No NFB line amp (GainWire mk2) - Page 22 - diyAudio
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Old 10th October 2013, 05:20 AM   #211
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Originally Posted by Joachim Gerhard View Post
I can send you a decent MC Cartridge.
You need it.
Hi Joachim
You can send one for me, I need it too
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Old 10th October 2013, 05:15 PM   #212
dadod is offline dadod  Croatia
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Here is corrected layout with thermaly connect Q13/Q15 and Q14/Q16. I hope I did not make mistakes, but is someone has a time to check.
BR Damir
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File Type: jpg GainWire-mk2-32_300-f.LAY].jpg (156.5 KB, 432 views)
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Old 10th October 2013, 06:39 PM   #213
RCruz is offline RCruz  Switzerland
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Ola Sergio

Another special riaa... that is my cup of tea..... please post the schematic..... Does it use any servo to control DC offset ?
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Old 12th October 2013, 04:12 AM   #214
cast is offline cast  China
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Default Current Audio Signal Transmission

Current Audio Signal Transmission
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Old 14th October 2013, 10:11 AM   #215
dadod is offline dadod  Croatia
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Originally Posted by dadod View Post
Here is corrected layout with thermaly connect Q13/Q15 and Q14/Q16. I hope I did not make mistakes, but is someone has a time to check.
BR Damir
Prototype board ready. I have bought 100 peaces of ONSEMI BC550C/560C and now I have to match them and I hope I've got enough of them.
BR Damir
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File Type: jpg GaiWire mk2 PCB-aa.jpg (320.6 KB, 371 views)
File Type: jpg GaiWire mk2 PCB-b.JPG (194.6 KB, 337 views)
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Old 19th December 2013, 11:55 AM   #216
dadod is offline dadod  Croatia
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This is proto board used for testing.
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Old 19th December 2013, 12:04 PM   #217
dadod is offline dadod  Croatia
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I gave up of using ODNF in this pre amp. Now it is going to have two possibility, NGFB, and CFA, and it is set by one jumper, J2 on is NGFB and J1 on is CFA operation.
ODNF is not easy to adjust, and CFA gives the same very low distortion. Now I can choose between those two operation and could compare the sound quality.
As the switch between NGFB and CFA shows different DC offset, DC servo was added.
Simulated THD:
NGFB output 4.5 Vpp
-------------line out phone 300 ohm phone 32 ohm
THD20k 10 ppm 14 ppm 0.01%
THD1k 8 ppm 12 ppm 0.01%

CFA output 4.5 Vpp
THD20k 0.05 ppm 0.15 ppm 2.55 ppm
THD1k 0.00 ppm 0.03 ppm 0.71 ppm

Output simulated level is more then enough and in more cases lower level is going to be used and with much lower distortion(NGFB).
I decided to make one PCB for dual mono with shunt regulator included. It needs a transformer and input selector + volume control to get complete line and phone preamplifier.
BR Damir
Attached Images
File Type: png GainWire-mk2-1.1.sch.png (39.6 KB, 218 views)
File Type: png ShuntReg+-15V-sch.png (30.1 KB, 186 views)
File Type: png GainWire-mk2-15_300-f-double.png (108.2 KB, 158 views)
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Old 20th December 2013, 12:35 PM   #218
Krisfr is online now Krisfr  United States
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Originally Posted by dadod View Post
Prototype board ready. I have bought 100 peaces of ONSEMI BC550C/560C and now I have to match them and I hope I've got enough of them.
BR Damir
I got 300 each, but they are from mouser - Fairchild....
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Old 20th December 2013, 12:38 PM   #219
mcd99uk is offline mcd99uk  United Kingdom
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I got 300 each, but they are from mouser - Fairchild....
Quick question.

Do you rate Fairchild devices above the OnSemi equivalent? I've always thought the opposite.
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Old 20th December 2013, 12:48 PM   #220
Krisfr is online now Krisfr  United States
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Originally Posted by mcd99uk View Post
Quick question.

Do you rate Fairchild devices above the OnSemi equivalent? I've always thought the opposite.
Oh no, I just got some BC550 and 560 from mouser, I did not know that there was a big difference between Fairchild and On Semi... maybe I need to get some from On Semi instead... Mine read BC550CBU... Is that GOOD or BAD?

The On Semi are 10 cents and the Fairchild are 6 cents... in hundreds... so maybe I can get some more
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Last edited by Krisfr; 20th December 2013 at 12:53 PM.
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