LTP CCS IXYS with 10m45s opinions

aroS3 · 4th April 2008, 08:01 AM

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

tubelab.com · 4th April 2008, 01:10 PM

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.

oshifis · 4th April 2008, 01:22 PM

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.

jazzbo · 4th April 2008, 02:12 PM

You'll get better performance if you cascode two of them....

jazzbo · 4th April 2008, 02:17 PM

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.

sorenj07 · 29th May 2009, 08:58 PM

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..

tubelab.com · 29th May 2009, 09:28 PM

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

sorenj07 · 30th May 2009, 02:47 AM

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?

4th April 2008, 01:10 PM	#2
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	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. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

29th May 2009, 09:28 PM	#7
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	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 __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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4th April 2008, 01:22 PM	#3
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	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.

4th April 2008, 02:12 PM	#4
jazzbo diyAudio Member Join Date: May 2007	You'll get better performance if you cascode two of them....

4th April 2008, 02:17 PM	#5
jazzbo diyAudio Member Join Date: May 2007	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.

30th May 2009, 02:47 AM	#8
sorenj07 diyAudio Member Join Date: May 2006	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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