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Old 19th January 2021, 10:26 AM   #1
Knoffers is offline Knoffers  United Kingdom
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Join Date: Dec 2010
Default Quick CCS Question

A quick (hopefully) question regarding the CCS in the SSE build. I bought all the components to build this amp 10 years ago but never got around to building it. With the current situation I have found myself with a bit of time on my hands so have dug it out of the cupboard and started to relearn how these things work. One of the CCS chips are missing and the one I have is a Supertex DN2540N5 - I also have a note that when using this instead of the IXCP10M45S that the R13 and R23 resistors need to be 100 ohms instead of the 330 ohm. I have purchased replacements CCS from RS components and (as I don't really know about the workings of the CCS) wanted to check that it was going to be ok. Part is below.

DN2540N5-G | N-Channel MOSFET, 500 mA, 400 V Depletion, 3-Pin TO-220 Microchip DN2540N5-G | RS Components

I am in the uk and can't get hold of the IXCP10M45S

If anyone can confirm that this part is ok before I start soldering that would be much appreciated.

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Old 19th January 2021, 11:20 AM   #2
adamus is offline adamus  United Kingdom
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Join Date: Apr 2008
Yes , the dn2540 works great. Two of them cascoded works really great.

You need a gate stopper (1k resistor from the gates) to stop any potential oscillation.

They vary a bit, 100r could be 20ma, could 25ma... I normally fit trim pot (500r, paralleled with a 500r resistor incase of an issue, and gives finer adjustment).

The beauty of these things...You can test them with a 9v battery, a 100r resistor and a cheap multimeter

Can i ask, what is your target current, and what b+, and what is your target anode plate voltage

Edit - just seen this is for a tubelad sse. DN2540 should be ok, max 400v though, they die instantly above that

Last edited by adamus; 19th January 2021 at 11:30 AM.
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Old 19th January 2021, 12:37 PM   #3
Knoffers is offline Knoffers  United Kingdom
diyAudio Member
Join Date: Dec 2010
Thanks for the reply - yes, its for the tubelab SSE - just wanted to check that this CCS is usable by changing the resistors. I can't get hold of the CCS that was specced in the recommended parts list.

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