Any clue of how to use this part as a current sink for a CF?
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 31st July 2004, 01:29 PM #1 G   diyAudio Member     Join Date: Apr 2002 Location: Belleville, IL. Any clue of how to use this part as a current sink for a CF? I've asked questions about this before about how to use it as a plate load. How would you use it as a current sink? Would you place a resistor above the "A" terminal and connect the "G" terminal to the top of the resistor? http://www.ixys.com/98704.pdf __________________ Gavin
Rod Coleman
работник
diyAudio Member

Join Date: Jul 2004
Location: Warwickshire UK
Quote:
 How would you use it as a current sink? Would you place a resistor above the "A" terminal and connect the "G" terminal to the top of the resistor?

No, don't use a resistor at the A. In fact you can use it as a sink just like the diagram in the PDF data. just connect the resistor (eg 100 Ohms for 25mA) from K to ground, connect G to ground, and connect the circuit you want to take a constant current FROM - to the A terminal.

Be sure to heatsink the device adequately to dissipate I(mA)*(Vdrop from A to K) in mW.

Take care if you are experimenting with a current source in a valve cathode circuit, since if it goes open-circuit you will get a big voltage between the two points going to A and K & A and G.

DougL
diyAudio Member

Join Date: Feb 2004
Location: Wheaton IL.
Quote:
 How would you use it as a current sink?
If you use figure 1, attach the Tubes cathode to A.
ground G and place the resistor K to Ground.
for 15 ma, the resistor appears to be about 200 ohms.
Basically looks a bit like a triode from a bias standpoint.
put negitive voltage on the K pin and ground the input, G.
AC is very like a pentode, BTW.

Important notes, indirectly heated triodes only. Directly heated triodes need a more complex treatment.

By the way, nice part. with 350v max, I bet its not cheap.

Doug

 31st July 2004, 03:17 PM #4 jan.didden   diyAudio Member     Join Date: May 2002 Location: The great city of Turnhout, BE Using it as a plate load, you connect pin A to your B+ supply, and the bottom part where G and Rk meet, to the tube's anode. The amplified signal is also taken from this last point. Note that the min dynamic resistnace is 10k, if you need more, it is better either to take a normal resistors or a real (discrete) current source. Also, the dynamic resistance can vary VERY wildly, so unless you have soem gain-stabilising feedback in your amp, it's gain will also vary all over the place. Jan Didden __________________ Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan Linear Audio pubs and articles . The SilentSwitcher now at diyaudio store SilentSwitcher. Keeping in touch with SY.
G
diyAudio Member

Join Date: Apr 2002
Location: Belleville, IL.
Quote:
 Originally posted by janneman Using it as a plate load, you connect pin A to your B+ supply, and the bottom part where G and Rk meet, to the tube's anode. The amplified signal is also taken from this last point. Note that the min dynamic resistnace is 10k, if you need more, it is better either to take a normal resistors or a real (discrete) current source. Also, the dynamic resistance can vary VERY wildly, so unless you have soem gain-stabilising feedback in your amp, it's gain will also vary all over the place. Jan Didden
Actually I believe Peter Millett said something, in his article about this IC, about the 10K figure being a typo and the dynamic resistance is actually 100K. Thanks for the responses.
__________________
Gavin

 3rd August 2004, 06:35 PM #6 Gary P diyAudio Member     Join Date: Apr 2002 Location: Portland OR Hi G It looks like they corrected the data sheet. It now shows a minimum value of 160K at ~10ma. I have measured one of the 10M45S parts in my CCS test setup. It performed very well for a single part CCS. It's performance was almost 10X better than the single Supertex DN2540. A cascade pair of DN2540's is a whole different story with very good performance. Having only one of the 10M45S parts I haven't been able to try cascading them. You can look at the graphs of CCS measurments made to date on my webpage. Look in the CCS measurments section. Gary Gary P's DIY page
G
diyAudio Member

Join Date: Apr 2002
Location: Belleville, IL.
Quote:
 Originally posted by Gary P Hi G It looks like they corrected the data sheet. It now shows a minimum value of 160K at ~10ma. I have measured one of the 10M45S parts in my CCS test setup. It performed very well for a single part CCS. It's performance was almost 10X better than the single Supertex DN2540. A cascade pair of DN2540's is a whole different story with very good performance. Having only one of the 10M45S parts I haven't been able to try cascading them. You can look at the graphs of CCS measurments made to date on my webpage. Look in the CCS measurments section. Gary Gary P's DIY page
Thank you Gary. They will do for a \$1.50 part. Especially for a low current preamp circuit. Thanks again.
__________________
Gavin

 5th August 2004, 12:30 AM #8 pedroskova RIP     Join Date: Dec 2002 Location: C'ville VA, USA I'm using the 10M45S part to set current for my VR tubes. So far, so good.
 5th August 2004, 01:34 PM #9 markanica   diyAudio Member   Join Date: Mar 2004 Location: Just below sealevel ? Hi, Does anyone know if these devices are available in The Netherlands ? I checked the IXYS website, found some european distributors, but sales are from 50 pcs. upwards... I just need a few to try out... Anyone? __________________ Mark
 21st September 2004, 01:14 AM #10 DWong   diyAudio Member   Join Date: Apr 2003 Location: I live in Hong Kong Has anyone tried cascading the 10M45S yet? I am very interested to try but I don't know how to implement it.

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