Phono Pre Amp

cberman · 7th October 2012, 04:58 PM

Hi All,

I've been reading these forums for the past few days. I've come up with a schematic and PCB based on the preamp design based on the TI application note "Application Note 1651 Keeping Up with the Expanding Demands of
High-Performance Audio". http://www.ti.com/lit/an/snaa046/snaa046.pdf

I also quickly put together a board for a simple LM317/337 +/-15V power supply.

Attached are the files.

kevinkr · 7th October 2012, 05:03 PM

Moved to Analog Source. (Most phono stages are located here.)

Welcome to the forum, posting your project here is a good start!

rsavas · 11th October 2012, 03:04 PM

Looks pretty good,let us know your test results and listening impressions.
May want to place some capacitors across the rectifier diodes to suppress the diodes switching transients.
Only one 100n cap at the LM317/337 inputs is required.
Do not rely on solder mask as an insulator for your heatsinks. Not sure if the will be sitting on the tip layer of the PCB.
Use 1% resistors for the RIAA equilization network & 2% film caps
I do not see any 100n/X7R bypass caps close to the supply pins of the opamps? These are necessary!!

Regards
Rick

7th October 2012, 05:03 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Moved to Analog Source. (Most phono stages are located here.) Welcome to the forum, posting your project here is a good start! __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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11th October 2012, 03:04 PM	#3
rsavas diyAudio Member Join Date: Aug 2012 Location: Ontario	Looks pretty good,let us know your test results and listening impressions. May want to place some capacitors across the rectifier diodes to suppress the diodes switching transients. Only one 100n cap at the LM317/337 inputs is required. Do not rely on solder mask as an insulator for your heatsinks. Not sure if the will be sitting on the tip layer of the PCB. Use 1% resistors for the RIAA equilization network & 2% film caps I do not see any 100n/X7R bypass caps close to the supply pins of the opamps? These are necessary!! Regards Rick