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sunrise 12th April 2006 08:12 AM

red led substitution questions
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.......?!

hint - i want to substitute led's in c4s ccs......:)

peranders 12th April 2006 08:26 AM

Using LED's or other voltage references is only a matter of taste and requirements.

sunrise 12th April 2006 08:32 AM

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....???


peranders 12th April 2006 09:06 AM

How does your actual circuit look like?

sunrise 12th April 2006 09:52 AM

2 Attachment(s)
this is the one

peranders 12th April 2006 10:03 AM

I would say a LED would do a quite nice job. You won't gain particulary much in take something else.

sunrise 12th April 2006 10:22 AM

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....

peranders 12th April 2006 10:44 AM

What do you mean by LND? From Supertex Inc?

sunrise 12th April 2006 11:03 AM

yes, yes - this little bugger......:D 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

edit.....oups....sorry guys about ***** - i did not know that this word is not used in forum :cannotbe:

Brian Donaldson 12th April 2006 11:13 AM

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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