For David

Michael Bean · 12th September 2011, 10:23 PM

David,
Sorry to take so long but I couldn't find the original files from several years ago, so I had to re-create them. No gerbers, just JPGs of the foil pattern, an X-ray view of the foil pattern, and a parts placement diagram. I used the "toner transfer method" to make my board. I also included a bill of materials for clarity. The single sided board measures 2 1/8" X 2 1/8". On the parts placement diagram which is not perfectly to scale, the decoupling electolytics are the small circles next to the LM4562, and are unlabeled. The decoupling NPO disc caps and the NPO feedback disc cap are all mounted on the bottom of the board right on the opamp pins. There's also a jumper on the bottom side of the board from pin 1 (output of opamp "a") to pin 5 (non-inverting input of opamp "b"). The circuit has a frequency resonse that is ruler-flat from less than 1Hz to in excess of 250kHz. It has extremely low THD, and noise is almost non-existent, and it sounds pretty good too.

BASIC PRE-AMP.JPG
BASIC PRE-AMP PCB foil side.JPG
BASIC PRE-AMP PCB top view.JPG
BASIC PRE-AMP PCB x-ray view.JPG
Basic Pre-Amp BOM.txt

Mike

CJ900RR · 13th September 2011, 02:59 PM

Hi.

I'm not David but this looks interesting

But, your BOM does not match up to the values in your schematic. Just a heads-up.

Michael Bean · 13th September 2011, 10:31 PM

Whoops, so much for clarity! Thanks for catching that, it was a mix-up from alternate versions, correct one below. I also forgot to add that C04 and R05 are baffle step correction of 3dB@480Hz (IIRC) for my particular speakers, so anyone wanting build this will probably need to eliminate them or modify the values to suit thier own system.

Basic Pre-Amp BOM.txt

Mike

martin martinez · 22nd September 2011, 06:59 PM

thanks! , ill give it a try!

12th September 2011, 10:23 PM	#1
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	For David David, Sorry to take so long but I couldn't find the original files from several years ago, so I had to re-create them. No gerbers, just JPGs of the foil pattern, an X-ray view of the foil pattern, and a parts placement diagram. I used the "toner transfer method" to make my board. I also included a bill of materials for clarity. The single sided board measures 2 1/8" X 2 1/8". On the parts placement diagram which is not perfectly to scale, the decoupling electolytics are the small circles next to the LM4562, and are unlabeled. The decoupling NPO disc caps and the NPO feedback disc cap are all mounted on the bottom of the board right on the opamp pins. There's also a jumper on the bottom side of the board from pin 1 (output of opamp "a") to pin 5 (non-inverting input of opamp "b"). The circuit has a frequency resonse that is ruler-flat from less than 1Hz to in excess of 250kHz. It has extremely low THD, and noise is almost non-existent, and it sounds pretty good too. BASIC PRE-AMP.JPG BASIC PRE-AMP PCB foil side.JPG BASIC PRE-AMP PCB top view.JPG BASIC PRE-AMP PCB x-ray view.JPG Basic Pre-Amp BOM.txt Mike

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13th September 2011, 02:59 PM	#2
CJ900RR diyAudio Member Join Date: Jan 2006	Hi. I'm not David but this looks interesting But, your BOM does not match up to the values in your schematic. Just a heads-up.

13th September 2011, 10:31 PM	#3
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	Whoops, so much for clarity! Thanks for catching that, it was a mix-up from alternate versions, correct one below. I also forgot to add that C04 and R05 are baffle step correction of 3dB@480Hz (IIRC) for my particular speakers, so anyone wanting build this will probably need to eliminate them or modify the values to suit thier own system. Basic Pre-Amp BOM.txt Mike

22nd September 2011, 06:59 PM	#4
martin martinez diyAudio Member Join Date: Jun 2004 Location: uruapan, michoacan, mexico	thanks! , ill give it a try!

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