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Old 5th November 2009, 09:57 AM   #21
S.A.G. is offline S.A.G.  Italy
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If balanced input is a concern it is probably best addressed with a transformer.
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Old 5th November 2009, 10:15 AM   #22
syn08 is offline syn08  Canada
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Quote:
Originally Posted by S.A.G. View Post
If balanced input is a concern it is probably best addressed with a transformer.
In every configuration you can think of, a transformer is the ideal low noise "amplifier". It happens that I don't like them, in particular for cost reasons
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Old 5th November 2009, 10:17 AM   #23
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I wonder if you ever sleep, Ovidiu. Considering the time zone shift ..
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Old 5th November 2009, 11:39 AM   #24
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This is not for MM at all... The input current noise will significantly degrade the noise performance. OTOH, you don't need 0.28nV/rtHz for MM so there's really no incentive to build this phono stage.
If your preamp is suitable for MC heads moreover (low output impedance), then because you have configured the input stage as follower (hi-imp), indeed of a common base input stage (lo-imp)?

Francesco.
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Old 5th November 2009, 12:10 PM   #25
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Ciao,
Quote:
If your preamp is suitable for MC heads
Not very suitable, but suitability is not a goal here...
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Old 5th November 2009, 01:57 PM   #26
syn08 is offline syn08  Canada
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Ciao,

Not very suitable, but suitability is not a goal here...
Thanks for the enlightening comment.
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Old 5th November 2009, 02:26 PM   #27
S.A.G. is offline S.A.G.  Italy
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Quote:
In every configuration you can think of, a transformer is the ideal low noise "amplifier". It happens that I don't like them, in particular for cost reasons
Cost is surely an issue. Flexibility is another issue. A transformer for MC cartridge is a bandpass filter, the high pass cutoff frequency is usually located very close to the resonant peak of the cantilever / stylus damper system. Getting a linear frequency response from the transformer / cartridge system can be challenging.
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Old 5th November 2009, 02:49 PM   #28
mos57 is offline mos57  Italy
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Quote:
Originally Posted by Lumba Ogir View Post
Ciao,

Not very suitable, but suitability is not a goal here...
But if this preamp is not for MM neither for MC, anybody can explain me clearly for what other purpose?


Ciao a tutti, Francesco.
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Old 5th November 2009, 02:59 PM   #29
S.A.G. is offline S.A.G.  Italy
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Francesco,

The HPS designs are suitable for low output voltage and low output impedance MC cartridge.
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Old 5th November 2009, 03:16 PM   #30
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syn08,
I`ve seen your approach as a lesson in how not to design a MC amp. Just looking at it makes me feel bad. Since nothing is done right, discard the whole idea and start from scratch.

I`ve already suggested Hiraga`s design to you. I assure you, it would not be easy for anybody to come up with something better. No ugly ICs, grounded base input topology, simplicity. Battery supply is a must, otherwise talking about noise is pretty meaningless.
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