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Old 14th March 2014, 12:07 AM   #3391
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Quote:
Originally Posted by miepa View Post
https://docs.google.com/document/d/1...-tE/edit?pli=1

look at hesener`s documents - its all in there!
I guess I'm missing it Michael.
I saw the section in the docs on how to disable the onboard buffer but not a section that outlines the components that are redundant when using the Calvin buffer. I'll keep looking.
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Old 15th March 2014, 10:15 AM   #3392
Calvin is offline Calvin  Germany
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Hi,

You can omit with all original buffer parts, i.e. Q90/91/92/99 and the associated resistors R12/13/15.
You may insert the Calvin Buffer instead, with the exception of the 100k Input resistor R15.
R15 may only be needed if the Calvin Buffer is used as standalone subassembly.

You also would need to change a couple of resistors in the power supply to deal with the increased current demand.

jauu
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Old 15th March 2014, 12:34 PM   #3393
shoom is offline shoom  Europe
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Quote:
Originally Posted by Howlindawg View Post
I guess I'm missing it Michael.
I saw the section in the docs on how to disable the onboard buffer but not a section that outlines the components that are redundant when using the Calvin buffer. I'll keep looking.
Hi Howlingdawg

i used the 7.5ohm Value CCS resistor suggested by Frans which works well in my set up.

''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''.

hope that helps
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Old 15th March 2014, 01:35 PM   #3394
RollE2k is offline RollE2k  Sweden
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Myself i use 9.0ohm CCS resistor and i do have 138-139mA total current - which in my case should be enough, 80mA + 27mA (Paradise+Calvin) which is 107mA total current. So i have approx 30-33mA shunt current. It should probably be closer to 40mA since the old output stage is removed (was around 6mA i think).
I don't have the largest case for my boards, so i try to get minimum heat needed.
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Old 15th March 2014, 04:19 PM   #3395
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Fantastic, that's very helpful.
Thanks all!
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Old 23rd March 2014, 12:58 PM   #3396
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Hello,

today I finally got around to install my Calvin buffers. I have two cases of "Shunt regulator LEDs do not light up – check for short circuits on the buffer or the connection"

Lights come up when I remove the buffers so it has to be on the buffers themselves (on both of them). I can't find any obvious shorts though. Any typical mistakes that lead to that error?

Many Thanks
Sven
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Last edited by Abraxas336; 23rd March 2014 at 01:23 PM.
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Old 23rd March 2014, 06:58 PM   #3397
RollE2k is offline RollE2k  Sweden
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Sven: I had the same problem on one channel - and for me it was the sinked transistor where the short was. So start checking there!
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Old 23rd March 2014, 07:01 PM   #3398
shoom is offline shoom  Europe
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''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).''


Hi Sven

have you changed the 10ohm resitor? you may not be pulling enough current through the shunt.

and

did you build the Buffers to the updated boom? also did you leave out the 100K R15?

just wild guess work but.
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Old 23rd March 2014, 07:16 PM   #3399
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Yes I did leave out R15 and I followed the few changes on the last page of the assembly guide. I don't have any visible shorts, I'm sure.

How about the pin layout of the output transistors - it seems the 2SA1381 is not different from the Fairchild BD14016STU I used. I assume the side with the writing faces up?

Beside the BD140 I used Fairchild J107 and PF5102 so the whole pin layout stuff should not be a problem?
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Last edited by Abraxas336; 23rd March 2014 at 07:21 PM.
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Old 23rd March 2014, 07:24 PM   #3400
RollE2k is offline RollE2k  Sweden
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For me the 2SA1381 was kinda "short-legged" so i isolated the legs with teflon tubing - since they pretty much touched the sinks. Even though somewhere there it became a short - until i moved them a little bit closer to the solder-pads. Then the problem went away. So i would start checking there.
Also, check that the J-fets are in the right direction.
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