This is very clear & well presented. But it does overlook key points. First, by reversing polarity (which does require tri state logic) you could actually drive 18 LEDs in the first example. Second, you don't have to drive only one LED at a time. An entire row or column can be lit at once allowing for a higher duty cycle. Third, multiplexing "Isolates" the LEDs, meaning that (unlike in chrlplxng) different number of LEDs can be at each "Junction" or even different components, motor, buzzer etc.
Perhaps when you say "two diodes in series" you mean other diodes in the matrix. Because an LED conducts current in only one direction, no "sneak paths" exist. If you used small incandescent bulbs, current could go through sneak paths and cause lamps other than the one "selected" to light, at least partially. --Jon
But there is a mistake! There are 2 diodes in seriel to an other. If you work with LED's , one is "full" on an two are are "half" on! Please look at the plan....
Electrons flow from minus to positive, but years ago people involved with electrical equipment decided that current would be defined as flowing from the higher potential (positive) to the lower potential (minus). --Jon
@SuperMicroguy In school we used Conventional Current flow and Electron flow..
Most circuits are drawn using Conventional Current flow from positive to negative, the idea which started by Benjamin Franklin.
Once Electron flow was understood, They did not change electronic notation because it was already standard to draw the current flow from Positive to Negative. And easier to understand that you have a Positive(More) to Negative(Less) vs. trying to get the idea of true current flow.
This is very clear & well presented. But it does overlook key points. First, by reversing polarity (which does require tri state logic) you could actually drive 18 LEDs in the first example. Second, you don't have to drive only one LED at a time. An entire row or column can be lit at once allowing for a higher duty cycle. Third, multiplexing "Isolates" the LEDs, meaning that (unlike in chrlplxng) different number of LEDs can be at each "Junction" or even different components, motor, buzzer etc.
gizmoguyar 2 months ago
I can really follow you very well on this video. You should become a teacher!
I am looking forward to see more videos in the future.
Many thanks for the video Jon!
PietervanDriel1 2 months ago
Nice video John.Many thanks.
valeramcgill2008 2 months ago
Perhaps when you say "two diodes in series" you mean other diodes in the matrix. Because an LED conducts current in only one direction, no "sneak paths" exist. If you used small incandescent bulbs, current could go through sneak paths and cause lamps other than the one "selected" to light, at least partially. --Jon
SuperMicroguy 3 months ago
But there is a mistake! There are 2 diodes in seriel to an other. If you work with LED's , one is "full" on an two are are "half" on! Please look at the plan....
gymactiv 3 months ago
Excelente, ¡Gracias!
troyjorlop 4 months ago
i have seen a lot of demonstrations about multiplexing but this video helps me to understand that... thanks
ArmerTropf 4 months ago
I thought the current flows from -(minus) to +(plus).
fcdcristy92 4 months ago
Electrons flow from minus to positive, but years ago people involved with electrical equipment decided that current would be defined as flowing from the higher potential (positive) to the lower potential (minus). --Jon
SuperMicroguy 4 months ago
@SuperMicroguy In school we used Conventional Current flow and Electron flow..
Most circuits are drawn using Conventional Current flow from positive to negative, the idea which started by Benjamin Franklin.
Once Electron flow was understood, They did not change electronic notation because it was already standard to draw the current flow from Positive to Negative. And easier to understand that you have a Positive(More) to Negative(Less) vs. trying to get the idea of true current flow.
nexusone1984 4 months ago
that's a lot of help :)
AmxCsifier 5 months ago
nice info
civicsi94 7 months ago
great video
MrElectrodesign 8 months ago