Hex 7-Segment Decoding with 33 Diodes (Concept)
Posted: Tue Jun 10, 2025 2:09 pm
Brought here from another thread, because I think the topic deserves its own thread.
I am thinking more of a switched (multiplexing) driver per display to GND and a switched current source from power plus per group of segments (all A seg. together, all B seg. together, etc.) in sync with the drivers, where the current sources are not switched ON but switched OFF by diodes in a matrix, a negative logic matrix so to speak.
The matrix could be something like this:
The logic around the matrix a bit like:
This for four byte address displays, two byte data displays and the last two special characters that display Modes like this:
This last gets a matrix a little different, the whole to being part of a cycle/step 65x02 tracer.
Comments are very welcome
barnacle wrote:
You could consider charlieplexing... of course, just seven OR gates will do it, if they have up to sixteen inputs each 
The matrix could be something like this:
This last gets a matrix a little different, the whole to being part of a cycle/step 65x02 tracer.
Comments are very welcome
