Error in the encoder tutorial?

Thread Starter

i_like_fire

Joined Jun 2, 2012
1
Hello everyone, I am an avid fan of the content here and a first-time poster; if this is not the right place to post this, please let me know ASAP.

I believe I have found an error on the encoder tutorial: http://www.allaboutcircuits.com/vol_4/chpt_9/5.html The boolean equations following the truth table on the 7-segment encoder seem off. These are not the answers I've gotten, and I have tested these on iCircuit and gotten incorrect results.

I am somewhat new to binary logic, so if I am wrong I would love to be corrected, but if anyone else can verify that these are wrong I'd be happy to take a stab at the right equations.
 

bretm

Joined Feb 6, 2012
152
It looks like the truth table would be right if the 7-segment display were rotated 180 degrees. It appears to be upside-down. Look at the row for 001 (four) for the best illustration of this.

So technically it's not wrong, just needs careful assembly instructions! :)
 
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