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Old 1st December 2013, 10:01 AM   #201
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Hi boris
Can you share the attenuation circuit that used for sound card input?
Best regards.
Thimios.
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Old 1st December 2013, 11:11 AM   #202
borys is offline borys  Poland
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Quote:
Originally Posted by thimios View Post
Hi boris
Can you share the attenuation circuit that used for sound card input?
Best regards.
Thimios.
You need potentiometer and optional two zeners to protect input of the sound card.
legs 1 and 3 to the load and leg no 2 to sound card -- thats it. To protect the sound card input just putt zeners across pin 2 and ground.
If you will have some artefacts put 10R resistor to separate signal GND from amp GND.
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Old 18th December 2013, 08:07 AM   #203
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I have made small changes and will prepare a final pcb. Nearly all produsct are going 100dB bellow signal - so it is good enough. Amp has good parameters from low output till clipping - all power spectrum.
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File Type: png 2.png (70.9 KB, 562 views)
File Type: png 3.png (73.7 KB, 538 views)
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Old 18th December 2013, 10:20 AM   #204
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Quote:
Originally Posted by borys View Post
I have made small changes and will prepare a final pcb. Nearly all produsct are going 100dB bellow signal - so it is good enough. Amp has good parameters from low output till clipping - all power spectrum.
Nice parameters,
Regards
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Old 21st December 2013, 05:55 PM   #205
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The final board has been made and was playing for couple hours. Next few days I will do some final tests and prepare 2nd channel.
I had to spend lot of time with that project (twice I was going to give up), but now I think it was really worth it.
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File Type: jpg bg5 v4.jpg (113.3 KB, 461 views)
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Old 21st December 2013, 06:47 PM   #206
Kuba_eM is offline Kuba_eM  Poland
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Hi Borys, could you attach final schematic of this amp, please? There is to many versions of BG4/5...
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Old 21st December 2013, 10:30 PM   #207
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The BG4 was with 2 LTP's at the front of the amp (development has stopped cause lack of my knowlage to sort out clipping issues). BG5 is version with single j-fet LTP at the front of the amp. So far it looks like on schematic bellow.
I just substituted two zeners in cascode with double leds. After I will do all tests Ill post whole documentation anyway.
Regards
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File Type: pdf BG5 schematic.pdf (15.7 KB, 209 views)

Last edited by borys; 21st December 2013 at 10:40 PM.
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Old 22nd December 2013, 08:08 AM   #208
Kuba_eM is offline Kuba_eM  Poland
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Thanks Borys, it is clear.
Happy Christmas for everyone!
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Old 4th January 2014, 08:59 PM   #209
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Small update, I have managed to stuff the enclosure with amp boards (two different versions Left and Right). Now i will have to make a listening test to make sure that all is OK.
DF was measured on finished amp after protect relay and inductor coil. I have seted the gain at x47 cause I am not going to use any preamp. After I will listen to It for a while I will post all schematics, thermo-transfer files etc.

So far it looks like bellow.
Attached Images
File Type: jpg DSC_1214.jpg (949.3 KB, 337 views)
File Type: png 1.png (61.4 KB, 134 views)
File Type: png 3.png (61.9 KB, 62 views)
File Type: png 5.png (61.3 KB, 51 views)
File Type: png BG5 DF 50V.png (155.1 KB, 68 views)
File Type: png BG5 v4 THD2.png (29.3 KB, 73 views)
File Type: png BG5 v4 THD.png (24.6 KB, 53 views)
File Type: png bg5 thd7.png (28.3 KB, 54 views)
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Old 5th January 2014, 12:01 AM   #210
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What's THD10k at 56,56 Vpp/4 Ohm ?
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