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Chip Amps Amplifiers based on integrated circuits

The BiAmp (aka My LM4766 + 6p15p project, and LM1875 project.)
The BiAmp (aka My LM4766 + 6p15p project, and LM1875 project.)
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Old 28th August 2013, 04:46 PM   #11
valtra103 is offline valtra103  Lithuania
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Photos, because i messed something with previous post...

http://imageshack.us/a/img593/405/ed9s.jpg
http://imageshack.us/a/img716/5616/5f8y.jpg
http://imageshack.us/a/img836/3405/lvlj.jpg
http://imageshack.us/a/img39/3247/vzxa.jpg
http://imageshack.us/a/img600/5760/q56t.jpg

Feel free to ask about stuff in photos
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Old 7th September 2013, 11:08 AM   #12
Mihkus is offline Mihkus  Estonia
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Can i have the .PCB file of the PCB?
I want to use your design but add few tweaks and replace my previous amp board that i bought from ebay, rubbish design. not too bad but still...

You can use this design and share it, remake it or do whatever you want, if you want
The bass is weak and muddy... But it sounds horrible compared to this :

Click the image to open in full size.
Attached Files
File Type: zip New WinRAR ZIP archive.zip (7.6 KB, 66 views)

Last edited by Mihkus; 7th September 2013 at 11:26 AM.
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Old 8th September 2013, 12:52 PM   #13
valtra103 is offline valtra103  Lithuania
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Quote:
Originally Posted by Mihkus View Post
Can i have the .PCB file of the PCB?
I want to use your design but add few tweaks and replace my previous amp board that i bought from ebay, rubbish design. not too bad but still...

You can use this design and share it, remake it or do whatever you want, if you want
The bass is weak and muddy... But it sounds horrible compared to this :
You can use my design.
I hope that i succesfully attached the files...
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Old 8th September 2013, 12:59 PM   #14
valtra103 is offline valtra103  Lithuania
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lm4766 v1.1.zip
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Old 8th September 2013, 04:12 PM   #15
Mihkus is offline Mihkus  Estonia
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Thanks alot!
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Old 30th September 2013, 01:24 PM   #16
Mihkus is offline Mihkus  Estonia
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Hey, I got a tinty question here...
I got 100x25x50mm heatsink... buit it heats up to near 60C Is it oscillating?...
Seems like it is :/ a bit hiss on the output too.
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Old 7th January 2015, 09:40 PM   #17
valtra103 is offline valtra103  Lithuania
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Quote:
Originally Posted by Mihkus View Post
Hey, I got a tinty question here...
I got 100x25x50mm heatsink... buit it heats up to near 60C Is it oscillating?...
Seems like it is :/ a bit hiss on the output too.
Sorry for crazy late reply. I forgot that i have this thread started. Did you get it working?
Im really sorry that i dissapeared like that
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Old 7th January 2015, 09:45 PM   #18
valtra103 is offline valtra103  Lithuania
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Hello,
Project BiAmp is fully finished now. It now have PCB with some transistors and RC delays to start transformers in needed order, and to hold tube heaters and fan some time after turn off. If someone needs it, i will post schematic of the delay circuit. But it is realy straight forward.

Recently i done last tweaks and mods, including cooling upgrade with very quiet fan. Now it is practicaly completely silent from listening position.

About LM1875. It is not completed, and i decided not to post anything of it in this thread. I stopped that project, at least for now.

Now few photos of BiAmp:

Before mods:

http://i.xomf.com/cbfbw.jpg

After:

http://i.xomf.com/pvrcd.jpg

Completed, only cover missing:

http://i.xomf.com/xpwbn.jpg

All photos of modification process in youtube video:

https://www.youtube.com/watch?v=4mxrTyLRmpY

Don't mind music. Had to use non copyright stuff.

Last edited by valtra103; 7th January 2015 at 10:11 PM. Reason: fixing photos
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Old 8th January 2015, 07:21 AM   #19
Mihkus is offline Mihkus  Estonia
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Ohh, I did get it working after I changed those SMD caps... They were low voltage ones and they both pretty much blew up but I didnt see that and even close inspection didn't give me much to see... But I changed them for 50V ones that are actually very common.
Cool project tho!
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Old 8th January 2015, 08:30 AM   #20
valtra103 is offline valtra103  Lithuania
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It's good to hear. I had the same problem with lm3886. My local electronics shop gave me wrong ones. And one blew at like 18V
No osscilation or ill effects was detectable So if i haven't seen smoke, it would remain with blown cap

Thank You for good words!
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