Thanks Marra, gutted they are unavailable so have to look for an alternative MM phono stage.
Many thanks Pavel I have just spent a very pleasant afternoon listening to the Openamp1 in tandem with my Sowter SUT and Denon DLS1 cartridge and must say that I am very pleased with the sound.Thanks again.
Hello guys, I am sorry but I have not been producing or selling anything of audio in the last year. I will give an info if anything is changed.
Right, thanks Pavel for the information. They surely looks good.
No chance that you would share the gerbers?
Regards
No chance that you would share the gerbers?
Regards
PMA;
some comments today in the Blowtorch thread reminded me that i meant to ask you a while ago why you chose LT1010 instead of BUF634 for OpenMM?
thanks,
mlloyd1
some comments today in the Blowtorch thread reminded me that i meant to ask you a while ago why you chose LT1010 instead of BUF634 for OpenMM?
thanks,
mlloyd1
never mind,
i saw the interesting distortion plot and your comments on opa637+buf634 line stage posted today in the blowtorch thread .
thanks,
mlloyd1
i saw the interesting distortion plot and your comments on opa637+buf634 line stage posted today in the blowtorch thread .
thanks,
mlloyd1
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.
The complete circuit may be downloaded from my website. I will probably release gerber files as well.
Finallllly got my phono stuff from the x ...
I can finally upgrade my implementation of a pre on PMA's PCB to the full OPENAMP1
Oh ...
BUF634
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
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
I can finally upgrade my implementation of a pre on PMA's PCB to the full OPENAMP1
Oh ...
BUF634
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
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
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Here's my pre implementation of PMA's pcb ...
...just to get it up and running. 😱
Now that finally have it back, I can go RIAA!
... Er, where's that resistor pack ....
...just to get it up and running. 😱
Now that finally have it back, I can go RIAA!
... Er, where's that resistor pack ....
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 😉
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 😉
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.
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
There are any other people interested in this pcb? For a minimal Gb we need at least 10 pcb order.
Sent from my iPad using Tapatalk
Sent from my iPad using Tapatalk
I believe this is a very good mm phonoamp. I'm very eager to sample it's sound qualities.
Regards
Regards