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N-channel JFET + multiturn trimming potentiometer = variable constant current diode?
N-channel JFET + multiturn trimming potentiometer = variable constant current diode?
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Old 24th February 2012, 01:28 PM   #1
Groundloops is offline Groundloops
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N-channel JFET + multiturn trimming potentiometer = variable constant current diode?
Default N-channel JFET + multiturn trimming potentiometer = variable constant current diode?

As the title says: Would a N-channel JFET (i.e. 2SK373) and a multiturn trimmer pot (hooked up as variable resistor) between source and gate give a variable constant current diode?
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Old 24th February 2012, 01:33 PM   #2
dirkwright is offline dirkwright  United States
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Quote:
Originally Posted by Groundloops View Post
As the title says: Would a N-channel JFET (i.e. 2SK373) and a multiturn trimmer pot (hooked up as variable resistor) between source and gate give a variable constant current diode?
Yes, up to the IDSS of the JFET, and up to the max Vds as well, considering the heat dissipation of the device.
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Old 24th February 2012, 06:45 PM   #3
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http://www.vishay.com/docs/70596/70596.pdf
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Old 24th February 2012, 08:41 PM   #4
dai is offline dai  Wales
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N-channel JFET + multiturn trimming potentiometer = variable constant current diode?
NO not between sourceand gate but between source and ground with the gate toground
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Old 26th February 2012, 06:50 PM   #5
Groundloops is offline Groundloops
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N-channel JFET + multiturn trimming potentiometer = variable constant current diode?
Quote:
Yes, up to the IDSS of the JFET, and up to the max Vds as well, considering the heat dissipation of the device.
Of course ...

Great reading!

Quote:
NO not between sourceand gate but between source and ground with the gate toground
My bad ...

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Last edited by Groundloops; 26th February 2012 at 06:52 PM. Reason: typo
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