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OPENAMP1 - MM phono preamp open project
OPENAMP1 - MM phono preamp open project
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Old 18th December 2015, 08:40 AM   #171
PMA is offline PMA  Europe
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OPENAMP1 - MM phono preamp open project
Wow!

May I ask what opamp are you using now? It should be definitely JFET input type because of the resistance against RFI, OPA134 is a decent opamp at a reasonable price and will make a good job in the OPENAMP1.
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Old 18th December 2015, 08:16 PM   #172
tER299 is offline tER299  Netherlands
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I'm currently using a OP177 because I got 2 free when ordering them. I'm thinking about going with a OPA827, since it's cheaper than the OPA627, but I'll order the OPA134 in the meantime. Thanks again for the advice
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Old 18th December 2015, 08:35 PM   #173
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OPENAMP1 - MM phono preamp open project
OPA827 should be fine, but there is no DIP version in production, only SMD package. So, OPA134 would be easier to use for you.
OP177 is not usable (SR = 0,3V/us), just only for the first test.
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Old 7th February 2016, 12:57 AM   #174
tER299 is offline tER299  Netherlands
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Well, I finally got around to finishing the preamp. Finally able to listen to my records again!

Turns out the housekeeper broke my turntable needle, so I can't hear anything from the left side -_-

Well, it sounds pretty much noiseless when hooked up to an old iPod, and I'm using the OPA134, so there's still more room for improvement

Thanks for all the help and the design Pavel!
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Old 7th February 2016, 09:52 AM   #175
PMA is offline PMA  Europe
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OPENAMP1 - MM phono preamp open project
Glad to hear you have successfully completed your preamp. OPA134 is fine, you can keep it. OPA627 will give you only a slight improvement in case that the needle is not in the groove yet . Once in the groove, there will be no difference, the groove noise will completely mask it.
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Old 4th November 2017, 07:42 AM   #176
gigigirl is offline gigigirl
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Hi, Does anyone know if boards are still available, Looks a very interesting phono to build. Cheers
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Old 4th November 2017, 09:18 AM   #177
PMA is offline PMA  Europe
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OPENAMP1 - MM phono preamp open project
I am sorry they are not, as I finished all audio kit sales in 2012. However, everything you need for it is published on my web page

Preamplifier for MM cartridge
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