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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’ve connected a decoder to 7-segment display as shown in figure.

Multisim and Ultiboard

When I connect an datasheeet, the LEDs doesn’t form numbers but they light up randomly. I just want to know the right way to connect the output pins of to the pins of 7-segment display? Each segment on a 7-segment display is designated a letter A-G. This is standard and is shown in the SN datasheet:.

You can use a diode tester or a datasueet voltage source and a resistor to determine the pinout of your particular display. Then just map the pins correctly again, from datasheet:.


Note that this datasheet illustration is a bit messed datashset and the bottom segment is D not Eand next segment clockwise lower left is E. The pinout is here:.

Simply wire the respective letters a. Pin 5 should go to GND.

SN Datasheet(PDF) – TI store

Note that this is an ancient display and an ancient TTL chip both are museum old and because it’s TTL open inputs will read as ‘high’. You need to tie them to appropriate logic levels RBI should be ‘0’ datzsheet you want to display a zero. Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A. Like the other two most popular answers, your 7 segment display needs to be connected to eatasheet properly Outputs to Seven-segment display inputs: However, they don’t seem to mention that you need to have the inputs of the connected to something for it to work like you want it to.


Here is a link to a video I made on instagram of mine working 7447nn this schematic: Thank you for your interest in this question.

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Would you like to answer one of these unanswered questions instead? Home Questions Tags Users Unanswered. How to connect decoder to 7-segment display?

Michael George 1, 8 34 This is standard and is shown in the SN datasheet: Then just map the pins correctly again, from datasheet: Armandas 6, 1 23 The pinout is here: Spehro Pefhany k 4 Danny Sebahar 9.