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LTP CCS IXYS with 10m45s opinions

aroS3

Member
2005-11-12 4:19 pm
Hi,
I'd like to use a couple of IXYS 10m45s as a current sink for 6sl7 LTP (6V6 PP amp).
Is there any mistakes or improvements in the schematic below ?
Thanks in advance,
George
 

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sorenj07

Member
2006-05-04 9:15 pm
Berlin
tubelab.com said:
If you have less voltage and only need 10mA, check out the National LM334. I have used that one with a - 7 volt supply (rectified 6.3 V). It is only good to 40 volts max, 10 mA max.

I'd like to feed 8mA into a 12AV7 LTP, and I also plan on rectifying a 6.3V heater winding. Could you explain how to calculate/wire a LM334 to work? I'm a bit clueless unfortunately..
 
Go to www.national.com and insert LM334 into the search box. The product page will show up. There are two circuits shown, you want the simple one on the right. Yeah, just a resistor and the chip. For 8 mA the resistor will be about 10 ohms. Connect the bottom terminal (V-) to your negative voltage source. and the top terminal (V+) to the 12AV7 cathodes. This chip will function with less than a volt so you may get by without a negative voltage (ground the V- terminal) although I have found that the chip likes some headroom. Rectified 6.3V is fine. Don't use over -35 volts.

Morgan Jones uses this chip in some of his designs and it is mentioned in the third edition but I am not at home now, so I don't know the page numbers.


http://www.national.com/mpf/LM/LM334.html