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OPENAMP1 - MM phono preamp open project
OPENAMP1 - MM phono preamp open project
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Old 5th November 2014, 06:00 PM   #151
nezbleu is offline nezbleu  Canada
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OPENAMP1 - MM phono preamp open project
Quote:
Originally Posted by Turbon View Post
Right, thanks Pavel for the information. They surely looks good.

No chance that you would share the gerbers?

Regards
I thought I read originally that it was called "OPENAMP1" because it was to be an "open" design, released under creative commons license or some such. Was I hallucinating? Am I confusing this with another project?

It is such a nice design, it would be of benefit to many if it was opened up so someone could organize a group buy or something.
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Old 5th November 2014, 06:05 PM   #152
PMA is offline PMA  Europe
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The complete circuit may be downloaded from my website. I will probably release gerber files as well.
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Old 5th November 2014, 10:39 PM   #153
AudioLapDance is offline AudioLapDance  Canada
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Finallllly got my phono stuff from the x ...

pre to OpenAmp1.jpg

I can finally upgrade my implementation of a pre on PMA's PCB to the full OPENAMP1


Oh ...

BUF634

BUF634sch.jpg

HIGH OUTPUT CURRENT: 250mA
SLEW RATE: 2000V/ms
PIN-SELECTED BANDWIDTH: 30MHz to 180MHz
LOW QUIESCENT CURRENT: 1.5mA (30MHz BW)
WIDE SUPPLY RANGE: 2.25 to 18V
INTERNAL CURRENT LIMIT

ABSOLUTE MAXIMUM RATINGS
Supply Voltage .................................................. ......... 18V
SPEC
Current Output, Continuous 250 mA

LT1010

lt1010sch.jpg

20MHz Bandwidth
75V/μs Slew Rate (=75,000V/ms)
Drives 10V Into 75Ω
5mA Quiescent Current
Drives Capacitive Loads > 1μF
Current and Thermal Limit
Operates from Single Supply ≥ 4.5V
Very Low Distortion Operation

ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage ..............................................22V
Continuous Output Current (Note 2).................. 150mA

Last edited by AudioLapDance; 5th November 2014 at 11:01 PM.
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Old 5th November 2014, 11:56 PM   #154
AudioLapDance is offline AudioLapDance  Canada
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Here's my pre implementation of PMA's pcb ...

pre on OPENAMP1.jpg

...just to get it up and running.

Now that finally have it back, I can go RIAA!
... Er, where's that resistor pack ....
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Old 6th November 2014, 07:39 AM   #155
PMA is offline PMA  Europe
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To everyone who might be interested, I have added the Gerber files for free download to the Openamp page:

Preamplifier for MM cartridge

You will find it below the assembled PCB photo, together with the pdf documentation. Should be used for personal use, not for business
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Old 6th November 2014, 08:32 AM   #156
atupi is offline atupi  Romania
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Very kind of you Pavel! A big THANK YOU from my side.
Maybe we can gather some interested people for a mini GB of pcb's.
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Old 6th November 2014, 02:43 PM   #157
Turbon is offline Turbon  Sweden
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Quote:
Originally Posted by atupi View Post
Very kind of you Pavel! A big THANK YOU from my side.
Maybe we can gather some interested people for a mini GB of pcb's.
Yepp, I'm in for two boards. Thanks alot Pawel!
Even without the gerbers it would still be an open project. Your decision what to share.

Regards
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Old 6th November 2014, 09:11 PM   #158
atupi is offline atupi  Romania
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There are any other people interested in this pcb? For a minimal Gb we need at least 10 pcb order.


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Old 6th November 2014, 09:18 PM   #159
Turbon is offline Turbon  Sweden
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I believe this is a very good mm phonoamp. I'm very eager to sample it's sound qualities.

Regards
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Old 8th November 2014, 12:33 AM   #160
nezbleu is offline nezbleu  Canada
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OPENAMP1 - MM phono preamp open project
That is indeed very generous, Pavel! I already have one so will not be interested at this time. I will say that it sounds very very good. Turbon i powered mine with a Salas shunt reg.
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