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Old 8th May 2013, 05:48 AM   #2151
quan is offline quan  Australia
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Quote:
Originally Posted by sq225917 View Post
I'd certainly give it a go were a pcb available.
Me too.
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Old 8th May 2013, 08:06 AM   #2152
hesener is online now hesener  Germany
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Here is the full schematic of my implementation. Please note I have replaced R14/R16 and R17/R19 with a 1kOhm trimpot each, but I just set them to the value the simulation indicated. In the Paradise, the buffer is inside the servo loop, so adjusting the offset would have to be done outside. The output zobel is not shown here but implemented just as in Calvin's schematic.
I will look into a little PCB for this....
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File Type: pdf calvin test1.pdf (7.6 KB, 159 views)
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Old 8th May 2013, 08:15 AM   #2153
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Thanks Alfred. I am a bit confused about R7 and R15.
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Old 8th May 2013, 08:16 AM   #2154
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The output is behind R3 ?
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Old 8th May 2013, 08:40 AM   #2155
hesener is online now hesener  Germany
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Sorry I left those in. Yes, R7 is just an input resistor and has no function in the circuit. Its parallel to a voltage source so it does not affect simulation. R15 is the output resistor I used in the simulation, just to have some load on the output. The output is just below R3.
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Old 8th May 2013, 08:46 AM   #2156
hesener is online now hesener  Germany
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Actually, C1 and C2 might be just a touch too small, there is a little overshoot in the response around 10MHz but thats the values I had at hand... I'm so lazy...
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Old 8th May 2013, 09:14 PM   #2157
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so how does it sound?
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Old 8th May 2013, 09:41 PM   #2158
hesener is online now hesener  Germany
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hi Stefano, check post 2147, its all there..... in short: great!
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Old 8th May 2013, 09:49 PM   #2159
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thanks for the review.
I think that this buffer gets very likely approved for Masterpiece too.

Also, on your picture I can't see what RIAA caps you are using at the moment!
Do you have the V-CAP on? I have never heard back from you on how you liked the upgrade.
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Old 8th May 2013, 09:53 PM   #2160
hesener is online now hesener  Germany
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still the Wima caps, unfortunately. Still, it sounds very nice. Vcaps will be the next upgrade, they are sitting there and waiting for me to find the time. Plus, a few more modifications- some exotic input trannies, a new servo, cooling for the input stage, .......

on my way to the Paradise Platinum Extreme......
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