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Old 5th November 2013, 09:43 AM   #371
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Default Trannies for Calvin GB update

Hi folks

All the trannies are on the way now
Before you start with the boards please read "Alfreds" new Link-list
(Calvin buffer assembly guide) and "Calvins" clarifications. Well done!!!!!!
I had a fault on my boards as well. But now is all clear.

Happy days
Werner
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Old 5th November 2013, 04:20 PM   #372
hesener is offline hesener  Germany
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Quote:
Originally Posted by hesener View Post
Interesting.... thanks for all that work and sharing your results, obviously it pays off to check twice! I should measure mine as well then again (yes I admit my lazyness, after assembly I was so eager to listen that I didnt re-measure ) and now my Paradise is with a friend......

Anyway, the assembly guides have been updated, fixing some BOM issues and I also added a stuffing diagram with the component designators, access through the link list in my signature.
.... and there was another bug.... should be fixed now (thanks a lot Werner!!!) The link remains the same.
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Old 8th November 2013, 03:02 PM   #373
atupi is offline atupi  Romania
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Anyone can tell me if pcb's has been shipped ?

Thanks,
Adrian
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Old 8th November 2013, 04:27 PM   #374
hesener is offline hesener  Germany
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look here Calvin Buffer for Paradise
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Old 8th November 2013, 04:52 PM   #375
atupi is offline atupi  Romania
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Well..... should be arrived until now. I can understand it is lost ?
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Old 9th November 2013, 08:57 AM   #376
hesener is offline hesener  Germany
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Give it one more week or so, no pun intended but Bucharest is farther away than San Francisco, in a postal way..... Please PM me if they don't show up until end of next week ok?
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Old 9th November 2013, 09:19 AM   #377
atupi is offline atupi  Romania
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Sure, no problem. Usually i receive parcels from Germany and other EU countries in about one week and from USA in about 10 days.

Let's see if it will appear in my mailbox after all.
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Old 10th November 2013, 04:49 PM   #378
kumori is offline kumori  Europe
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Quote:
Originally Posted by Bksabath View Post
Alfred culd you please post a guide for very dumb peoples (like me) on matching the Jfets

Tanks
I also have a little trouble with matching here.

I determined Vp of the 2SK170 and PN4391 I used with this method. Apparently it is a little bit coarse, but I assumed I only needed to get good relative values.

Vp of the SK170 was in the range of -0.63 V to -0.64 V, IDSS around 9-9.5 mA
Vp of the PN4391 was around -6.5 V

Still I get a relatively large DC offset at the output of around 350 mV on one channel and 450 mV on the other. The 2k trimpot only can adjust it within about +-50mV, so I cant set it to zero.

Despite proper matching within the 2SKs and PN-transistors, do they have to fit to each other? So do I need a specific 2SK170 Vp (or IDSS) range together with the right PN4391 Vp-range ? The built manual states around 8-8.5 mA IDSS for the 2SK170 so Im a little higher here. Is this ok?

Or is it crucial to set up Andrews measurement setup from post 368?
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Old 12th November 2013, 09:23 AM   #379
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Gents. Is there any spare boards left ? I d like to ask one board for my stand alone buffer.
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Old 13th November 2013, 05:11 AM   #380
Catal is offline Catal  Italy
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Boards arrived,
thanks Alfred.

Frank
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