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Old 15th April 2011, 02:07 AM   #1
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Default K & K Audio Two Terminal Constant Current Source

Greetings everyone,
Just wanted to ask if anyone has used the K & K Audio Two Terminal Constant Current Source and what their experience has been like.

Thanks,
Ray
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Old 15th April 2011, 09:37 AM   #2
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No experience, but those kits are literally nothing more than a depletion mode mosfet, one or two resistors and a trimpot. I don't really see the added value of purchasing this as a kit instead of buying the components and wiring them in a point-to-point fashion.
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Old 15th April 2011, 09:42 AM   #3
Raj1 is offline Raj1  United Kingdom
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Quote:
Originally Posted by mastodon View Post
No experience, but those kits are literally nothing more than a depletion mode mosfet, one or two resistors and a trimpot. I don't really see the added value of purchasing this as a kit instead of buying the components and wiring them in a point-to-point fashion.
I suppose anyone that's asking the OP question probably needs a schematic to build something of similar ilk...
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Old 15th April 2011, 09:47 AM   #4
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Click the image to open in full size.Fair enough
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Old 15th April 2011, 10:05 AM   #5
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Quote:
K & K Audio Two Terminal Constant Current Source
Which one?

But never mind about the non-cascaded version. Get a cascaded version. (If you plan on using it as a plate load OR in the tail of a LTP) The non-cascaded version would do fine for instance in the output section of say a Baby Huey PP EL84.

And as mastodon says you could build those yourself.

The IXYS IXTP01N100D is reputed to sound better than the Supertex DN2540N5 and that is why K and K now use them. (Actually they use both in the cascaded but one is strategically placed where it has more effect)

Unfortunately us Europeans cannot buy IXYS IXTP01N100D.

Last edited by Bas Horneman; 15th April 2011 at 10:07 AM.
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Old 15th April 2011, 11:06 AM   #6
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Only thing I don't care for with the design is they thermally bond the two FETs together on the heat sink. By keeping the lower FET isolated and in free air (it doesn't dissipate much anyway) you reduce long term thermal drift. The upper FETs current is dictated by the lower.
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Old 15th April 2011, 12:21 PM   #7
Doz is offline Doz  United Kingdom
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Quote:
Originally Posted by Bas Horneman View Post

Unfortunately us Europeans cannot buy IXYS IXTP01N100D.
Ironically , I used to buy IXYS IGBT's from the Netherlands

Digikey will ship you one...
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Old 15th April 2011, 12:28 PM   #8
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So will Mouser.

edit: Oops, they won't.
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Old 15th April 2011, 12:46 PM   #9
SY is offline SY  United States
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Two DN2540, three resistors, you have a current source as close to perfect as one could even need in audio. $3 plus a square inch of perf board. Heat sink on the upper FET. You're done.
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Old 15th April 2011, 02:15 PM   #10
tinitus is offline tinitus  Europe
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yeah, we 'noobs' really should learn to do this

but you know, even simple diodes can cause headaches to some us

I wouldn't mind more input on this subject
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