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Phono Pre Amp
Phono Pre Amp
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Old 7th October 2012, 04:58 PM   #1
cberman is offline cberman
diyAudio Member
Join Date: Sep 2012
Default Phono Pre Amp

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.
Attached Images
File Type: png PreAmp.png (42.2 KB, 269 views)
File Type: png PreAmpPSU.png (35.2 KB, 262 views)
Attached Files
File Type: pdf PhonoPreAmp.pdf (22.0 KB, 124 views)
File Type: pdf PreAmpPSU.pdf (20.9 KB, 59 views)
File Type: txt PhonoPreAmpbom.txt (2.0 KB, 32 views)
File Type: txt PreAmpPSU_bom.txt (1.6 KB, 22 views)
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Old 7th October 2012, 05:03 PM   #2
kevinkr is offline kevinkr  United States
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Join Date: Sep 2004
Location: Boston, Massachusetts
Phono Pre Amp
Moved to Analog Source. (Most phono stages are located here.)

Welcome to the forum, posting your project here is a good start!
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 11th October 2012, 03:04 PM   #3
rsavas is offline rsavas  Canada
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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!!

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