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Old 4th April 2008, 08:01 AM   #1
aroS3 is offline aroS3  Greece
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Question LTP CCS IXYS with 10m45s opinions

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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Old 4th April 2008, 01:10 PM   #2
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I have used exactly the same circuit with good results. With -24 volts the IXYS chip works good. A slight improvement may be noted with much higher voltages.

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.
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Old 4th April 2008, 01:22 PM   #3
oshifis is offline oshifis  Hungary
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Has anybody used the 1N5283-1N5314 current regulator diode range? I use a 3.9mA and a 4.3mA parallel, supplied from the -50V bias voltage and they work fine.
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Old 4th April 2008, 02:12 PM   #4
jazzbo is offline jazzbo  Canada
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You'll get better performance if you cascode two of them....
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Old 4th April 2008, 02:17 PM   #5
jazzbo is offline jazzbo  Canada
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On second look: Only 2 mA... Performance may be marginal with the IXYS chip. Try the 2 transistor LED-biased CCS in the Baby Huey thread.
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Old 29th May 2009, 08:58 PM   #6
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Quote:
Originally posted by tubelab.com
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..
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Old 29th May 2009, 09:28 PM   #7
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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
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Old 30th May 2009, 02:47 AM   #8
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Couldn't be more simple. Thanks! I'll post pics when she's done.

Wait a minute. Do you think I could get by with leaving the center-tap on 6.3V grounded, and just full-wave rectifying the 3.15-0-3.15V (more like 3.3-0-3.3V) to get around -4.5V?
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