Can u read this EDN schematic

[sivan_and]

This is a circuit that appeared in EDN...tried all filters and "negative view" no luck any one?

 

[I_Forgot]

It looks perfectly readable from here...

I_F

 

[ashok]

How does it look to you ?

It's perfectly readable on my screen also.

 

[Eva]

I can read all values and all text.

 

[sivan_and]

Am finding it difficult to connect Q2 R5,R6,LED , L and LED.whr is R4 connected ?..Hey can u jentle men take a screen shot and post please ?

 

[cliffforrest]

Does this help?

Your original is actually a colour .gif with not really enough resolution to process


"Am finding it difficult to connect Q2 R5,R6,LED , L and LED.whr is R4 connected "

Ummm.... none of those components are on this schematic

 

[ashok]

Sivan,
Maybe the image you wanted has not been posted.
Check out the image on your post and confirm you can find the missing resistors ...etc.

 

[sivan_and]

HUuu..what an idiot !! me...Wrong schematic posted...Sorry

 

[rpapps]

Hi Sivan
Can you post the original EDN .pdf or a link to it?
Cheers
Rob

 

[sivan_and]

EDN original article Link: http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=8968
and the schematic:
http://www.elecdesign.com/Files/29/8968/Figure_01.gif

 

[rpapps]

Hi Sivan
This should make more sense.
I worked it out from the description in the article.
Sorry for the delay - dinner came along.
Cheers
Rob

 

[sivan_and]

Oops u missed out..R2 and sure abt diode polarity ? of D2...
Anyway thanks for ur efforts..highly apppreciated !!!

 

[rpapps]

Hi Sivan
oops - sorry about that. Revised drawing attached.
Yes, D2 is correct.
Cheers
Rob

 

[rpapps]

Hi Sivan
In the original article, the second sentence in paragraph four has an error.
It should read:

"Provided the values of R5 and R6 are chosen correctly, Q2 turns on while the LED is on and pulls the RESET input low."

Cheers
Rob

 

[Enzo]

And one small detail, after I looked through the EDN archives for a while, Electronic Design and EDN are two separate magazines. I read them both, but they don't share the archives between them.

 

[sivan_and]

Thanks rpapps (Rob) and Enzo: thanks for ur inputs....
Actually was looking for some application for white LED drivers wprking with battery volts as low as 1volts.
I think this will be interesting to continue this in new topic..wat do u say gentlemen ?