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Old 21st May 2011, 02:13 PM   #21
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Thks (grazie 1000) Gianluca.
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Old 26th May 2011, 07:05 PM   #22
sheep is offline sheep  Canada
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How does a pair of transistors cascoded like the Bottlehead C4S perform?
It uses 2 red LEDs and 2 transistors in a cascode.
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Old 26th May 2011, 07:16 PM   #23
SY is offline SY  United States
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It would appear to be pretty much the same as the diyAudio CCS boards offered a few years ago and the CCS shown in Morgan Jones's "Valve Amplifiers." Performance is very good- not as good as cascoded DN2540, but good enough that it won't be the limitation in any circuit you're likely to build.
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Old 27th May 2011, 07:45 PM   #24
sheep is offline sheep  Canada
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I'll try them. They should be better than LM317 CCS.
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Old 31st May 2011, 05:11 PM   #25
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Hey ok I got mine in, if you still need a few.
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Old 1st November 2011, 09:05 PM   #26
tmblack is offline tmblack  United Kingdom
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How do you calculated the resistor values for the DN2540 current source?
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Old 1st November 2011, 09:14 PM   #27
SY is offline SY  United States
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You can approximate them from the published curves, but there's enough batch-to-batch variation that you might want to set up a test jig to determine the resistor value (IME, the resistor value will be pretty consistent device-to-device in the same batch). For 10mA, a good starting point will be about 300R. For 20mA, about 120R. For 5mA, about 560R.
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Old 1st November 2011, 09:38 PM   #28
tmblack is offline tmblack  United Kingdom
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Are they good as current sources in the range of 0.5mA to 2mA?
Some say a gate resistor should be used, or can I just ground the gate to the source resistor?
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Old 1st November 2011, 09:46 PM   #29
SY is offline SY  United States
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You absolutely want a gate-stopper resistor. Anything from 300R-3k will work, but you want the resistor body as close to the gate as possible. The work very well at low currents, but I would definitely cascode them.
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Old 1st November 2011, 10:18 PM   #30
Magz is offline Magz  United States
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Quote:
Originally Posted by Bas Horneman View Post
A single 10M45S is better than a single DN2540. But a cascaded DN2540 beats a 10M45S big time. Not sure if you can cascade 10M45S.

Check this out: CCS performance measurments


Damn. Wish I had know that. My last order from Mouser was for 73 euro's and I had to pay 20USD shipping.

K and K audio says the IXYS IXTP01N100D is better than the DN2540. Unfortunately. Europeans are NOT allowed to buy that part from the US of A.
Yes, you can cascade the IXYS part; I use the 10M45S cascaded in my preamp as a plate load, with SiC Schottky diode bias. It sounds excellent.
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