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Old 18th February 2013, 10:20 AM   #2161
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Not sure how various cartridges will appreciate that input resistance.
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Old 18th February 2013, 06:41 PM   #2162
Bibio is offline Bibio  Scotland
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@ rjm

is there an eta on when you will have more phonoclone kits for sale?
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Old 21st February 2013, 05:42 AM   #2163
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@bibio Though it doesn't say so, I'm out of both Phonoclone 3 and VSPS 300 boards right now. Everything back to normal from March 3rd.

@vulejov The input series resistance linearizes gain and frequency response at the expense of S/N. It's a reasonable tradeoff either way.
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Old 21st February 2013, 05:53 AM   #2164
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Quote:
Originally Posted by rjm View Post
@bibio Though it doesn't say so, I'm out of both Phonoclone 3 and VSPS 300 boards right now. Everything back to normal from March 3rd.
A friend of mine who orders boards frequently from a source in China told me that there's a two week delay because of holiday activities there, probably related to their New Year celebrations.
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Old 21st February 2013, 05:55 AM   #2165
vulejov is offline vulejov  Serbia
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Quote:
Originally Posted by rjm View Post
@vulejov The input series resistance linearizes gain and frequency response at the expense of S/N. It's a reasonable tradeoff either way.
With LT1028 noise is 400 uV on 20kHz...

I dont believe that cartridges have linear frequency response when working in "zero impedance".. I dont believe manufacturers..
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Old 21st February 2013, 11:46 AM   #2166
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thanks Richard.
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Old 21st February 2013, 10:27 PM   #2167
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Manufacturers make no claims about the linearity outside of when the cartridge is used with its recommended loading.

"zero impedance" is not zero, the cartridge always sees it's own impedance. The load resistance is added to this value. This flattens the frequency response by swamping the effect of the cartridge inductance.
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Old 25th February 2013, 09:36 AM   #2168
vulejov is offline vulejov  Serbia
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LM7812/7912 are very good for this phono..
For C8-C11 is better 1uF polyester, there is no use of electrolytic capacitor..
For C3 use MKP..
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Old 25th February 2013, 11:11 PM   #2169
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A heavy-modded Phonoclone RC board from some years back. Nice work. You might want to connect the traces properly at C11, R4 and LM7812 though. Also the hole diameter of the extra pad you added at C3 is too small to be useful...
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Old 26th February 2013, 08:19 AM   #2170
vulejov is offline vulejov  Serbia
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Thanx, Eagle signalised something wrong but traces are good.. this is your original board, I use it because phono works very nice with LM7812/7912..

There is final version, 100 Ohms load is optimal for most cartridges.. gain is 64 dB, enough for my amp but who wants more it is better to change R3 than R4..

First chip is LT1028 and I will try LT1115, but dont expect any difference... second chip is LT 1028 but this is not so important like first one.. thinking about LME 49710 for second..
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