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Old 2nd November 2012, 09:53 PM   #8441
RCruz is offline RCruz  Switzerland
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What pot value are you using in the dcb1 input ?
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Old 2nd November 2012, 09:59 PM   #8442
atupi is offline atupi  Romania
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Digital pot pga2311 installed after dcb1.
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Old 2nd November 2012, 10:36 PM   #8443
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Originally Posted by atupi View Post
Digital pot pga2311 installed after dcb1.
You are killing the basic advantages of a buffer to keep the output impedance low and stable and drive the interconnects.
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Old 2nd November 2012, 11:00 PM   #8444
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Thank you Andrew & Salas for the links.
I got #8380 the other day !

I havn't made anything with JFET's before...
...so I have a few PDF's etc. to read !
Good move to make some kind of measurement jig...
...& 'audio' test circuit.
Can drop 'em in and out of a 'test' simplistic...
...or the 'JFET Bride Of Zen' also looks interesting; as there ain't almost nothing there !
( listen to a few Soviet caps as well ! )

Thanks for the links again.

Cheers

Si.
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Old 2nd November 2012, 11:56 PM   #8445
atupi is offline atupi  Romania
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Originally Posted by dimkasta View Post
You are killing the basic advantages of a buffer to keep the output impedance low and stable and drive the interconnects.
I installed the DCB1 before PGA2311 because i know that PGA is buffered on the output.
If you or anybody else is having a better idea im happy to listen.

Last edited by atupi; 3rd November 2012 at 12:09 AM.
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Old 3rd November 2012, 12:57 AM   #8446
Salas is offline Salas  Greece
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Quote:
Originally Posted by atupi View Post
If my Simplistic goes to a DCB1 what should be the minimum value of the output cap of Simplistic ?
DCB1 is 220K input without a pot. 1uF should do plenty. 0.68uF even.
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Old 3rd November 2012, 02:24 AM   #8447
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So with a 25k pot in the dcb1, maximum input impedance would be ~255k, for which a 1.5 or 2.2 uf capacitor would suffice. That said I'll probably go with the 3.3 uf one to allow different preamps in the future!
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Old 3rd November 2012, 02:28 AM   #8448
Salas is offline Salas  Greece
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No, if you will use a pot between RIAA and DCB1, the impedance to couple for will be the pot's own across. 3.3uF is fine since the interstage rolls off subsonic anyway.
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Old 3rd November 2012, 08:34 AM   #8449
atupi is offline atupi  Romania
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For a 0.1uf interstage what is the rolloff freq ?
Finally got teflons
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Old 3rd November 2012, 08:42 AM   #8450
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by atupi View Post
Digital pot pga2311 installed after dcb1.
Hi atupi

can you set gain in the pga2311 ?
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