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Old 4th January 2010, 11:52 AM   #151
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Here my own compilation of the complete parts list phono preamp and shunt regulator section with distributors, prices, etc...Maybe Peter can comment on its latest findings about the circuit to see if this list is still up to date. I included the omission of R7, output resistor of the preamp section.
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Old 4th January 2010, 11:54 AM   #152
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Quote:
Originally Posted by Algar_emi View Post
Here my own compilation of the complete parts list phono preamp and shunt regulator section with distributors, prices, etc...Maybe Peter can comment on its latest findings about the circuit to see if this list is still up to date. I included the omission of R7, output resistor of the preamp section.
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File Type: pdf Phono BOM_small.pdf (31.7 KB, 251 views)
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Old 4th January 2010, 02:05 PM   #153
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Here an updated version, removed C3-C6 on the Shunt regulator as suggested by Peter.
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File Type: pdf Phono BOM_small.pdf (11.2 KB, 278 views)

Last edited by Algar_emi; 4th January 2010 at 02:11 PM.
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Old 4th January 2010, 02:44 PM   #154
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In majority cases C4 is still needed as most LM337 types will not produce correct voltage without it: The Phono Stage
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Old 4th January 2010, 03:06 PM   #155
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Also, while you specify Nichicon (Mouser 647-UES1H100MPM) for C3, the Wima MKS2 may be actually a better choice (when BG N is not available)
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Old 5th January 2010, 04:38 PM   #156
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Peter,

Do you have a high gain version of this available? I'm not sure if it is just a few parts in the BOM that need to change or if it is entirely different.

Thanks,
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Old 5th January 2010, 04:45 PM   #157
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I was told that the gain can be adjusted with R2, R3 (3k3 presently) and of course by using cartridge with different internal resistance.
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Old 5th January 2010, 07:48 PM   #158
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Thanks Peter for the precision. SB
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Old 3rd February 2010, 11:48 PM   #159
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Peter,

A couple of questions:

1. What value is necessary for R2/3 to raise the gain to 90db?

2. IF using a battery supply, is it possible to eliminate caps C4/5? I couldn't find them in the schematic posted on the first page of the thread either.

Best,

Chris
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Old 4th February 2010, 01:20 AM   #160
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1) I really don't know, never experimented with gain.

2) It could be possible, but again, it needs to be tested. Even with batteries, I usually prefer to use some caps, but much smaller in value.
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