Alternate 7-segment display sought

62sunbeam

62sunbeam

Raconteur
I need to replace the 7-segment displays in my SAE 8000 tuner and I can't seem to find the requisite DL747 that should be in there.

Does anyone know where either I can find 4 DL747s or if the following ebay item will work?

370286670213

Thanks

Eric

Here's what I have in there now:

64920ec2.jpg

5b1b83e1.jpg
 
Register to hide this ad
The problem with 7-segment displays is that there was never a standard pinout, nor standardized sizes.

I worked on an SAE tuner a few years ago with a bOrked segment, and right when I was ready to give up an eBay seller popped up selling NOS replacements.

Keep watching the 'Bay, and you come up with something. The alternative is to dig through Mouser, Digikey, and Newark catalogs and try to find something that will work (and IIRC, there isn't anything that would not mean hacking on the PC board to get the traces to go to the proper pins).
 
While your looking for displays, find the manual and bulletins (or get the information from someone who has it) for changing the resistors. (the row of 270 ohm resistors at the bottom of the display. Also FWIW the color dots on the displays were for brightness color matching.
 
Last edited:
Why would those resistors need to be changed? 270 ohms
is right for a 5V supply - which is what that board would be
running on, looking at all those 74xxx series ICs.

Try this - use 5V for the supply, 1.5V for the voltage drop, and 15ma
for the current in the online LED calculator, and the recommended
resistor will come up as 270 ohms.

http://led.linear1.org/1led.wiz

Edit: sregor - I just found your other post here, about reducing the LED current.

http://audiokarma.org/forums/showpost.php?p=4932915&postcount=2
 
Last edited:
Yours either has been modded, or is a later run - the original values of the limiting resistors was 180 ohms, mod changed them to 270.
 
Wouldn't it be prudent to check the IC drivers (assuming that's what's in the sockets?) and reseat them or swap them to see if the fault moves? Also, check the resistors for possible failure, assuming you can trace back the segment to the right resistor. Or cross wire some segments so that known good driver and resistor goes to that LED segment?

Eric, is it a good assumption this is a red Litronix DL747 display or is it green? Are you planning to replace just one unit or all of them? The hard part is this is an 18 pin device with a number of pins omitted. Hmmm.

If I don't have some in my old electronics stock, suggest calling All Electronics in downtown LA, or try Apex Electronics in SFernando Valley or ApexJr in Southbay - those are the leading surplus houses locally - I suspect Fry's won't have it.
 
I tried Apex on San Fernando and was unable to find any but that doesn't mean they didn't have them.

The LEDs are red by the way.

The search continues.

Thanks

Eric
 
try this ebay seller from auction item # 170637759330. He had 3 left when the auction ended in June 2011, you might email him and see if he had any more. These look like the National Semi equivalents to the DL-747.

Nuts - further checking indicates he sold the last 3 in this auction end of July - 260826085030

However, checking under the National Semi number of NSN64R, two auctions , one with # 360387471436 gives some good pics and dimensions, plus rear pin appearance (but no schematic), lead spacing looks pretty close - the other # 370287130942 has a nice listing for lots of stock of this part (cheaper too), and is Advanced Computer Products in Santa Ana and they do a lot of surplus electronics too (been to their warehouse in the distant past). so the price is also make offer and local, so you might be able to scare up a bunch for less than dinner and match brightness.

As a point, found this info on the web about another guy in 2009 selling a mod kit using what looks like a 0.8 inch vs 0.6 inch tall display module, but can't tell if it is (was pin compatible). could also be 1.0 inch tall, states its about 0.25 inch taller dispaly than OE in the SAE 8000. Can't tell who the seller was, Doesn't link to any ebay auction, just has the description of the product so I think I can put the link here:

http://www.worthpoint.com/worthopedia/aftermarket-led-modules-sae-8000-mark-66859050

NEW aftermarket
LED Modules for SAE 8000 & Mark VIII Tuners
Do you have an SAE 8000 or Mark VIII FM tuner with a display that has burned out segments?
The OEM DL-747 LED modules have become obsolete and no longer available.
Any found will be 25+ years old and may or may not be of consistant quality or intensity. Note: SAE Service Bulletin 8-3 states that their DL-747 modules are color coded according to brilliance and should not be mixed.
After quite a bit of research I located a suitable replacement that fits perfectly, looks great, consistant quality and in abundant supply. They are about .25" taller but as shown in the picture, look great.
Since these are newer technology and require less voltage to operate, a LM7805 voltage regulator & heat sink are included as well as detailed instructions. Easy to install. Standard PC board soldering & desoldering techniques are required.
Reliability? I personally have been running 3 of these SAE tuners with these modules for 2 years without any failures and have sold a large number of these online with zero failures.
The DL-747 shown in the picture is bad and for size comparison only.
old and may or may not be of consistant quality and intensity if they work at all. After quite a bit of research I located a suitable replacement that fits perfectly, looks great and in abundant supply.

pics are the last 2.

Good luck! Still looking for the NSN64R data sheet to confirm if pin compatible.
 

Attachments

  • dimen1.jpg
    dimen1.jpg
    65.8 KB · Views: 71
  • Dimen back.jpg
    Dimen back.jpg
    67.1 KB · Views: 67
  • ACP.jpg
    ACP.jpg
    76.3 KB · Views: 61
  • SAE 8000 with mod.jpg
    SAE 8000 with mod.jpg
    12.5 KB · Views: 88
  • taller LED mod.jpg
    taller LED mod.jpg
    8.9 KB · Views: 71
mech986 said:
try this ebay seller from auction item # 170637759330. He had 3 left when the auction ended in June 2011, you might email him and see if he had any more. These look like the National Semi equivalents to the DL-747.

Nuts - further checking indicates he sold the last 3 in this auction end of July - 260826085030

However, checking under the National Semi number of NSN64R, two auctions , one with # 360387471436 gives some good pics and dimensions, plus rear pin appearance (but no schematic), lead spacing looks pretty close - the other # 370287130942 has a nice listing for lots of stock of this part (cheaper too), and is Advanced Computer Products in Santa Ana and they do a lot of surplus electronics too (been to their warehouse in the distant past). so the price is also make offer and local, so you might be able to scare up a bunch for less than dinner and match brightness.
Click to expand...

Edit: The NSN64R pinout does appear similar.
The only difference I could spot is that 62sunbeam's pic shows the Decimal point on the left, but the ebay ones
have it on the right. Or do they have two DPs?

mech986 said:
As a point, found this info on the web about another guy in 2009 selling a mod kit using what looks like a 0.8 inch vs 0.6 inch tall display module, but can't tell if it is (was pin compatible). could also be 1.0 inch tall, states its about 0.25 inch taller dispaly than OE in the SAE 8000. Can't tell who the seller was, Doesn't link to any ebay auction, just has the description of the product so I think I can put the link here:

http://www.worthpoint.com/worthopedia/aftermarket-led-modules-sae-8000-mark-66859050

NEW aftermarket
LED Modules for SAE 8000 & Mark VIII Tuners
Do you have an SAE 8000 or Mark VIII FM tuner with a display that has burned out segments?
The OEM DL-747 LED modules have become obsolete and no longer available.
Any found will be 25+ years old and may or may not be of consistant quality or intensity. Note: SAE Service Bulletin 8-3 states that their DL-747 modules are color coded according to brilliance and should not be mixed.
After quite a bit of research I located a suitable replacement that fits perfectly, looks great, consistant quality and in abundant supply. They are about .25" taller but as shown in the picture, look great.
Since these are newer technology and require less voltage to operate, a LM7805 voltage regulator & heat sink are included as well as detailed instructions. Easy to install. Standard PC board soldering & desoldering techniques are required.
Reliability? I personally have been running 3 of these SAE tuners with these modules for 2 years without any failures and have sold a large number of these online with zero failures.
The DL-747 shown in the picture is bad and for size comparison only.
old and may or may not be of consistant quality and intensity if they work at all. After quite a bit of research I located a suitable replacement that fits perfectly, looks great and in abundant supply.
Click to expand...

I found that one too. I think this was the ebay seller - shortcircuit43
 
Last edited:
quadtech said:
Edit: The NSN64R pinout does appear similar.
The only difference I could spot is that 62sunbeam's pic shows the Decimal point on the left, but the ebay ones
have it on the right. Or do they have two DPs?

I found that one too. I think this was the ebay seller - shortcircuit43
Click to expand...

The ebay ones pictured have the DP on the left, the far right dot seems too far and low to be a right hand DP. As for shortcircuit43, yes, his feedback indicates he sold the modules as late as Dec. 2010.

Eric, can you measure the width of the pin out? the datasheet says 7.62 mm but this doesn't look the same as your pin out - looks to be closer to 15.5 mm which would fit the below unit.

The below from Jameco in California might be the 0.8 inch high units discussed in the modification module. It has the very similar dimensions as the DL747, same pin out, common anode, and has a left hand and right hand DP. Appearance wise, looks the same as pictured in the mod. Ends up being cheaper too, the LiteOn LTS-3401LC. Just omit the pin for the right hand DP. What is the power supply voltage coming into the display? That may be why the mod includes a 7805 voltage regulator to keep the forward voltage of the display down.

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1955811_-1

1955811.jpg


datasheet:
http://www.jameco.com/Jameco/Products/ProdDS/1955811.pdf
 
quadtech said:
The picture of the "aftermarket" LED display seems very much like a HDSP-3400, which has the left hand DP.
See ebay listing #390122435982

Another equivalent display seems to be the NTE3080 available
from many vendors.

NTE3080.jpg

http://www.nteinc.com/specs/3000to3099/pdf/nte3080_series.pdf
Click to expand...

Agreed on the HDSP-3400, but more expensive on the auction. However, the NTE part has a RHDP, not LHDP and is more expensive too at retail, almost double the HDSP, at Electronic Plus, San Rafael.

The Jameco part is just over a buck.
 
Last edited:
The jameco LiteOn part comes in Red as noted above and also an orange - Check ebay #220672394880 for the LTS3401LE, available at JameCo also for cheaper than the auction, don't know about shipping though.
 
SAE 8000 segment display replacement........

I've been following this thread (as well as your original post concerning the replacement of just one segement) and hopefully you'll be successful in accomplishing this challenge that you are facing in regards to replacing 'all' of the segments in your SAE 8000 FM tuner.
The SAE 8000 FM tuner is an "expectional" tuner! I've been after one for sometime now and have come across a couple but the asking price was just way too much. Maybe soon, one of these days I'll get one.
Again, good luck on your project and post pictures once you've completed the final outcome.

EDIT** By the way, exactly what are the differences between the SAE 8000 FM tuner and the SAE MARK VIII tuner? Is one better than the other?
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom