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Old 12th April 2006, 08:12 AM   #1
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Default red led substitution questions

Hi,
could anyone tell me what to use if i want something better than red LED as a voltage reference.... i was thinking maybe to use LM336-2.5.......?!
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sunny

hint - i want to substitute led's in c4s ccs......
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Old 12th April 2006, 08:26 AM   #2
Electrons are yellow and more is better!
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Using LED's or other voltage references is only a matter of taste and requirements.
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Old 12th April 2006, 08:32 AM   #3
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well, i would like to substitute those leds to try something that would work there in that ccs better..... the problem is that i am not sure if adding LM336-2.5 instead of the red led would cause some non-stabilities...... i will calculate resistors but don't know about the stability of the ccs....
if i use LM336-2.5 - would it be stable and would it be good to use little (few pF) capacitor in paralel with the LM336-2.5 if i use it there....???

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Old 12th April 2006, 09:06 AM   #4
Electrons are yellow and more is better!
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How does your actual circuit look like?
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Old 12th April 2006, 09:52 AM   #5
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this is the one
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File Type: jpg resize of img001.jpg (72.3 KB, 282 views)
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Old 12th April 2006, 10:03 AM   #6
Electrons are yellow and more is better!
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I would say a LED would do a quite nice job. You won't gain particulary much in take something else.
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Old 12th April 2006, 10:22 AM   #7
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o.k. thanks.......

can you sugest something maybe to substitute that ccs ....something that will be arround 25mA, and that would not be the design from mr. Pimm (not that i don't like it (i value his work a lot) - the problem is to find LND transistors - and i also would like to have it on a solid state without tubes in ccs)....this ccs was my only choice for now.....
something better would be nice - since this ccs is sounding very good....
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Old 12th April 2006, 10:44 AM   #8
Electrons are yellow and more is better!
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What do you mean by LND? From Supertex Inc?
What is LN1EP
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Old 12th April 2006, 11:03 AM   #9
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yes, yes - this little bugger...... LND150 - SuperTex

i can't buy that one easy so it is a problem to make revision 5 from Mr. Pimm that i would be also interested in....
well, problems, problems
regards
sunny

edit.....oups....sorry guys about ***** - i did not know that this word is not used in forum
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Old 12th April 2006, 11:13 AM   #10
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Yes, we have a lot of young hildren who read this forum, so we're not allowed to say ****, ***, ****, ****, crap, ****, ****, or anything not allowed on childrens shows.
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