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Old 27th June 2011, 08:43 PM   #11
SY is offline SY  United States
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Old 28th June 2011, 02:24 AM   #12
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Noted the CCS using Mosfet in HMN phono pre
For now, just would like to know how to implement using a resistor
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Old 28th June 2011, 03:00 AM   #13
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That depends. What circuit are you putting it in?

If you know the voltage across the CCS, you can calculate a resistor from R = V/I.
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Old 28th June 2011, 11:19 AM   #14
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CCS is to feed a shunt regulator for a preamp supply
So just measure the voltage across input and VR output.
Remove everthing that is shown in my schematic, Right?

Last edited by Audiohifi; 28th June 2011 at 11:25 AM.
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Old 28th June 2011, 01:37 PM   #15
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Pretty much, yes. Presumably, the CCS was sized to be twice the maximum expected current. If the raw supply has any sag under load, take that into account in the Ohm's Law calculation.
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Old 29th June 2011, 03:49 AM   #16
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Thank you SY for your explanation. Is that simple, hopefully it will sound better than
LM317T CCS
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Old 1st July 2011, 05:16 AM   #17
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If I remove the whole ccs circuit including mosfet, zener, resisors, etc and replace with a resistor, would not the circuit becomes ordinally current flow and not constant current flow? Just like a plate resistor.
Or I just replace only the LM317 after measuring the voltage across it
This tweak was discussed in Audio Asylum for the Super Regulator sold by Vacuum State,
but the exact method was given through PM
Glad to know how exactly it is done
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Old 1st July 2011, 09:50 AM   #18
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Schematics

ccs317.jpg

Last edited by Audiohifi; 1st July 2011 at 09:54 AM.
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Old 1st July 2011, 10:54 AM   #19
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Quote:
Originally Posted by Audiohifi View Post
If I remove the whole ccs circuit including mosfet, zener, resisors, etc and replace with a resistor, would not the circuit becomes ordinally current flow and not constant current flow?
Yes. You lose most of the benefit of the CCS by doing this. I'm still not sure of the motivation, but I suspect Allen Wright is spinning in his grave.
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