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OPENAMP1 - MM phono preamp open project
OPENAMP1 - MM phono preamp open project
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Old 9th August 2018, 10:03 AM   #181
PMA is offline PMA  Europe
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Thank you both for the positive feedback. I am glad that the preamp works well and that you like it. IMO it shows that even with opamps we may get very good sound and profit from the buffered output.
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Old 13th August 2018, 09:54 PM   #182
spaceistheplace is offline spaceistheplace
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Default OPENAMP1 - MM phono preamp open project

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Originally Posted by PMA View Post
For those who might be interested, I have prepared an open project of the phono preamplifier for MM cartridge. It has very low noise and very low distortion. Gain is 40dB/1kHz. Output is capable to drive 50 ohm load, so one may directly connect headphones via 100 - 220 ohm pot. Please feel free to download documenation from



Preamplifier for MM cartridge


Link is dead in OP. Can you update to the new link here: Preamplifier for MM cartridge

(would be nice to have in the OP)

Are there Gerbers available for JGs MC head amp? Perhaps PSU?
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Last edited by spaceistheplace; 13th August 2018 at 10:00 PM.
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Old 14th August 2018, 06:35 AM   #183
PMA is offline PMA  Europe
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Several years ago my pages were moved to my server, address is in my signature. You will find openamp there as well.

Pavel Macura audiopage
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Old 17th August 2018, 01:32 PM   #184
chat72 is offline chat72
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Is it possible to modify riaa a bit. I think lifting around 100-2000hz or suppress treble around 5k-10k would suite my need. I am using standard value.
Thank

C.S.
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Old 21st August 2018, 08:20 PM   #185
kamis is offline kamis  Serbia
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Is it necessary to reduce value of power rail capacitors ( 470 micro) if shunt voltage regulator is connected close to preamp ?
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Old 22nd August 2018, 09:55 AM   #186
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Quote:
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Is it necessary to reduce value of power rail capacitors ( 470 micro) if shunt voltage regulator is connected close to preamp ?
I have no problem using 470uf with Salas shunt.
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Old 23rd August 2018, 03:18 AM   #187
nezbleu is online now nezbleu  Canada
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Quote:
Originally Posted by chat72 View Post
I have no problem using 470uf with Salas shunt.
Agreed I used a Salas BiB shunt regulator for my Openamp-1 with no issues and no modifications of the circuit. I connected the regulator to the phono board with a short length of shielded twisted pair, about 6 inches as I recall. (and yes I mean 2 regulators, one positive one negative. The voltages were rock solid.)
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