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Old 20th October 2013, 06:46 PM   #2961
galac is offline galac  Germany
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Location: Duisburg
The Calvin Buffer is a top upgrade to the paradise. First impression: punchier and more
dynamic without downsides.

Last but not least - now my paradise is totally quiet. Before I've had some troubles and
need to install the compensation-caps in the ps (rev. 3.0). Without them the hiss/noise was not tolerable.

With the calvin (due to the offset trimmer) the servo has to do less work too. before calvin pin 6 was ~ 3V - now it is ~100mV.

Many thanks @calvin for the fanatastic buffer and @hesener for the groupbuy!

cheers
galac

p.s. I matched the jfets
pp.s One advice for new paradise builders: Don't solder the smd-caps in before you have

tested the regulator and the riaa-amp. These little suckers cost me a lot of time ;-)
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Old 20th October 2013, 07:12 PM   #2962
hesener is offline hesener  Germany
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That was quick..... thanks a lot for the news!!
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Old 20th October 2013, 07:16 PM   #2963
RollE2k is offline RollE2k  Sweden
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By the way - is there any reason to match the hfE of the psu 327/337's?
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Old 20th October 2013, 07:42 PM   #2964
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Offset should go down to maximum plus-minus 2mV when you thermo couple the input transistors.
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Old 20th October 2013, 08:56 PM   #2965
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In complete agreement, in my paradise down to + - 1,5 mV
Take care
Werner
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Old 21st October 2013, 06:19 AM   #2966
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by galac View Post
pp.s One advice for new paradise builders: Don't solder the smd-caps in before you have

tested the regulator and the riaa-amp. These little suckers cost me a lot of time ;-)
Very good advise.... last time I had trouble because of minute shorts made under the SMD caps.
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Old 21st October 2013, 07:59 AM   #2967
hesener is offline hesener  Germany
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Quote:
Originally Posted by RollE2k View Post
By the way - is there any reason to match the hfE of the psu 327/337's?
Not really, as long as they are strong enough - the -40 grade is just fine
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Old 21st October 2013, 10:33 AM   #2968
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by RollE2k View Post
By the way - is there any reason to match the hfE of the psu 327/337's?
No, is not needed. (as hesener said).

Last edited by FdW; 21st October 2013 at 11:02 AM.
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Old 21st October 2013, 07:18 PM   #2969
FdW is offline FdW  Netherlands
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Default About the Paradise PSU when using Calvin buffers

When using Calvin buffers in combination with the Paradise RIAA the preamp is going to need a bit more power than originally planned. The Paradise RIAA needs about 80mA and the Calvin buffer needs an additional 30mA.

For the shunt to function it needs to consume a few mA’s (30mA is the design value, actual values from 25 up to 50mA are acceptable). This results in 30ma x 18V = 540mW and 110mA x 8V = 880mW constant power consumption in the voltage regulator (Shunt, CVS and CCS), the total power supply consumption is:
2 x ((30mA 18V) + (110mA 8V (26Vin – 18Vout))) = 2.8Watt

When connecting the Calvin buffer an additional 30mA needs to be supplied, the CCS setting needs to be changed from 110mA to 140mA, this can be done by changing the 10 Ohm resistors to 7.5 Ohm resistors. See the attached JPG (The attached screen shows the CCS current in the PSU for (E24) resistors from 4.7 to 10 Ohm (currents from 240…105mA (give or take a few mA’s)).

The ‘normal’ power supply dissipation now changes to:
2 x ((30mA 18V) + (140mA 8V (26Vin – 18Vout))) = 3.4Watt

This should not be a problem with the supplied heat sink, but care should be taken to ventilate the area surrounding the PSU heat sink.

When testing the PSU (with the RIAA and buffer disconnected) the total power consumption in the PSU will be 140mA x 26V = 7.3Watt. If the PSU is not placed in a closed box this should not be a problem, the heat sink may get hot (up to 70C or so) and should not be touched (but you will know (as a regular soldering iron user)).

As ever, be sure that the final enclosure is well ventilated (especially around the PSU).

Regards,
Frans.

These are the most important/relevant messages regarding PSU and Pre-Reg.
  1. Mpp #4375 PSU-pre-regulator.
  2. Mpp #4610 V2 Schemas UPS and Amp.
  3. Mpp #6506 CCS fine-tuning.
  4. Mpp #6462 PSU with my notes.
  5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
  6. Mpp #7127 More about transformer selection.
  7. Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
  8. Mpp #7733 Grounding (PSU, RIAA and Player).
  9. Mpp #7810 35V PSU for the CroMagnon.
  10. Mpp #7830 The PSU explained.
  11. Mpp #8386 My resistor recommendation’s.
  12. My Paradise #56 PSU Noise.
  13. Masterpiece #951 That's not a PSRR test (it's a CIR test)
  14. PradiseBuilders #13 Schema's and assembly guide.
  15. PradiseBuilders #155 Vdc input voltage minimum simulated.
  16. PradiseBuilders #970 PSU oscillates; posible solutions?
  17. PradiseBuilders #983 Compensating the PSU for oscillations.
  18. PradiseBuilders #1173 Fixing oscillations (up to #1182).
  19. PradiseBuilders #1322 Fuse .
  20. PradiseBuilders #1387 Updated Paradise R3 assembly guide (Also German).
  21. PradiseBuilders #1403 Capacitors bad vs good.
  22. PradiseBuilders #1593 PSU Power Transistor selection.
  23. PradiseBuilders #1644 PSU Output Impedance.
  24. PradiseBuilders #1680 PSU Power Supply Suppression Ratio(PSSR).
  25. PradiseBuilders #1772 NJF selection for the PSU.
  26. PradiseBuilders #1887 Empirical NJF Rgs determination.
  27. PradiseBuilders #2127 More about the PSU fets (J113's etc).
  28. PradiseBuilders #2969 About the Paradise PSU using Calvin buffers.
Have a look at these and their following messages.
Attached Images
File Type: png Paradise PSU adjustment for Calvin buffers.PNG (126.1 KB, 552 views)

Last edited by FdW; 21st October 2013 at 07:25 PM.
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Old 21st October 2013, 07:23 PM   #2970
hesener is offline hesener  Germany
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Many thanks Frans for this excellent explanation (as usual )
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