Red LED substitution questions

sunrise · 12th April 2006, 08:12 AM

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.......?!
regards
sunny

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

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?
What is LN1EP

sunrise · 12th April 2006, 11:03 AM

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

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.

12th April 2006, 08:12 AM	#1
sunrise diyAudio Member Join Date: May 2005 Location: delta quadrant	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.......?! regards sunny hint - i want to substitute led's in c4s ccs...... __________________ when you burn it - burn it good

12th April 2006, 08:26 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Using LED's or other voltage references is only a matter of taste and requirements. __________________ /Per-Anders (my first name) or P-A as my friends call me

12th April 2006, 08:32 AM	#3
sunrise diyAudio Member Join Date: May 2005 Location: delta quadrant	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....??? __________________ when you burn it - burn it good

12th April 2006, 09:06 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	How does your actual circuit look like? __________________ /Per-Anders (my first name) or P-A as my friends call me

12th April 2006, 10:03 AM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I would say a LED would do a quite nice job. You won't gain particulary much in take something else. __________________ /Per-Anders (my first name) or P-A as my friends call me

12th April 2006, 10:22 AM	#7
sunrise diyAudio Member Join Date: May 2005 Location: delta quadrant	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.... __________________ when you burn it - burn it good

12th April 2006, 10:44 AM	#8
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	What do you mean by LND? From Supertex Inc? What is LN1EP __________________ /Per-Anders (my first name) or P-A as my friends call me

12th April 2006, 11:03 AM	#9
sunrise diyAudio Member Join Date: May 2005 Location: delta quadrant	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 __________________ when you burn it - burn it good

12th April 2006, 11:13 AM	#10
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	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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