Looking for 7 segment LED display

Oct 02, 2005 11 Replies
D

I have a Keithley digital microvoltmeter which has a fault in one of its red LED display digits. The part is a Fairchild FND561 which is no longer available. I am having trouble finding a replacement and would appreciate any suggestions in finding an equivalent, though I'd reckon siomething should be available.



The display is the leading digit which displayes +/- 1. It is a 13mm DIP package.



As it has both the 1 and the sign of the signal, its absence makes the meter of limited use! Any suggestions greatly appreciated. Dave


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B

Check the pinout against other 1/2" common cathode types. You will probably find the pinout is rather standardised.

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T

The meter would be slightly more useful if you swapped the high-order and low-order digits.

But not much.

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P

Now Components,

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in Fla., USA claim to have 595 of them in stock. They specialise in "hard to find, long lead time, end of life and obsolete components" , take all the major plastic and I've dealt with them once before. You could enquire using their online form to see if they really have them. Depends on how badly you want the part.

PH

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D

Thanks Peter,

I need one of them . . And US500 minimum IS a bit on the high side . I could buy a new instriment for that price.

Problem is that I can't seem to find the "+/-1." configuration elsewhere. . Plenty of comparable 7-segment digits, but none like this yet.

Thanks for the suggestion.

Dave

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P

"David"

** You ARE a fussy so and so.

Who the hell needs to see a " + " sign ???????

Millions of digital displays do fine with just a " - " sign using the middle bar of a seven segment display. The absence of " - " is taken as being " + " by default.

Capice?

Nearly any 13mm LED display will get that old Keithley going.

........ Phil

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D

Now THAT is thinking . . Thanks Phil. . (in any case I guess a 1 isn't all THAT important in the scheme of things!)

I'll give it a try as I have some (wrong colour) 13mm displays. Make sense and might get me out of a fix. I wonder if it IS that simple?

Dave

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P

"David"

** Top posting hotmailer, Dave, might be smarter to invest in a screwdriver before wasting his dough on a LED display.

.......... Phil

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D

Are you in Melbourne Dave?

If so, Rockby in Clayton have a surplus store next door to their shop which has various LED displays, I think I saw one similar to your requirements recently.

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R

I have 2 off MAN73A

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if these are any use.

Ross Herbert

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F

On Sun, 02 Oct 2005 07:38:14 GMT, "David" put finger to keyboard and composed:

Would an NTE3076 (CA) or NTE3077 (CC) be suitable?

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Both are ".560 inch, 7 segment, 1 digit with overflow and +/-, RH decimal point".

The going price in single quantities appears to be ~US$5.

These data (pinouts, package dimensions, specs) from my old NTE catalogue might be of some help in comparing displays:

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-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

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