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Old 21st March 2013, 12:14 AM   #421
MiiB is offline MiiB  Denmark
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there's is also a Pspice model, that can be used in LT-spice, but as a sub-circuit, It's beyond my skills to build a working model from that. LTspice has a lot of op-amps built in also differential ones and sub-circuit ones, but finding the right "similar" one can be a hassle.
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Old 21st March 2013, 12:53 AM   #422
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Quote:
Originally Posted by Joachim Gerhard View Post
MiiB, i build many shunt RIAA stages with the OPA1632 and with my values the result was precise to plus-minus 0.1dB so input impedance of the OPA1632 is a non issue.
Juma, the guy who created this opamp also suggested the meed for a buffer
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Old 21st March 2013, 01:10 AM   #423
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That opamp can push more then 100mA so why the need of a buffer ?
Can you show me the creators response ?
Juma did that opamp ? Unlikely.
This is new to me.
I have under certain circumstances experienced that this chip can get quite hot, that can be solved with a copper trace in the MOPS version and with a cooling profile in the regualr SMD version.
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Old 21st March 2013, 01:31 AM   #424
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I probably misread or misunderstood. Wouldnt be the first time.
SuSy Circlotron - jFET input Buffer + OPA1632 + 2SK135
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Old 21st March 2013, 01:45 AM   #425
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It has two buffers inside the chip. Juma, an opamp designer ?
No way.
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Old 21st March 2013, 04:10 AM   #426
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Quote:
Originally Posted by MiiB View Post
there's is also a Pspice model, that can be used in LT-spice, but as a sub-circuit, It's beyond my skills to build a working model from that. LTspice has a lot of op-amps built in also differential ones and sub-circuit ones, but finding the right "similar" one can be a hassle.
Yeah kind of arc to convert from PSpice to LTSpice.
I will have to find a suitable part to create a model for the circuit.
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Old 21st March 2013, 04:14 AM   #427
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FYI: Joachim sorry I have to catch back tomorrow morning with your posts as I was busy until now trying to prototype the older differential input stage as I was curious to see how it performs.
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Old 21st March 2013, 09:41 AM   #428
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Good that you try the differential input. That can be for the benefit of the Paradise community.
Concerning the Masterpiece from my side there is no rush.
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Old 21st March 2013, 02:41 PM   #429
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Originally Posted by RCruz View Post
... I will try those.
Ricarditto,

easier to find if you google punch Philips 60pF.
e.g. : Teflon trimmer 60PF van Philps -hf-electronics

or 2222-809 (-05xxx to -09xxx ,are the ptfe series of Philips/BC components)
e.g. : https://www.elfa.se/elfa3~tr_en/elfa...item=68-798-03

Or http://www.newark.com/vishay-bc-comp...00v/dp/98K7134
Same routine at ebay.

Or be a teflon cheapo : adjust a polyester trimmer cap to value, then exchange for Pearl Two
(as a part fetishist, my religious beliefs forbid such activities)
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Last edited by jacco vermeulen; 21st March 2013 at 02:54 PM.
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Old 21st March 2013, 02:43 PM   #430
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Thats very clever Mr Beatty.
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