I understand the math. I suspect you only used one resistor to make the circuit easier to understand. Making a video based on a comment by a troll, even though he was right is big of you. These displays cost about 20 cents a piece and anyone who follows along knows this therefore I do not believe you needed to explain the math behind it just to make some moron feel good about himself. It is a very good video despite of why you made it. Trolling someone who is trying to help people is bad practice. You've taught me so much about cmos that I have the utmost respect for you. I think the person who made the comment should start his own channel if he wants to go around flexing his V=IR muscles belittling one of the smartest people I know.
Nice vid, however the assumption that LEDs have constant internal resistance is incorrect. Depending on the voltage used, the resistance changes inversely in relation to voltage. Some chips such as CD4026 do not require the use of current-limiting resistors since they have internal current regulation.
Wish I had watched this before ordering 30 assembled LED display boards with no resistors on the LEDs at all! I thought I could save it by adding a single resistor.... but no.... luckily I can opt to run it at 3V - I think...
LEDs will work fine with 10mA 5mA and 1mA or less. You cant calculate the internal resistens of a LED! if you supply a 3.3 volt LED with enough amps, the LED will take as much current as possible, it will burn through. if more current flows, the lower the resistance of a led, it wants to die! you always need a resistance! if you take a button cell, then this is already the resistance.if you only use one resistor for a seven segment display, then the 8 will be darker than the 1
Thank you. This is exactly what I wanted to know
Glad it was helpful!
I understand the math. I suspect you only used one resistor to make the circuit easier to understand. Making a video based on a comment by a troll, even though he was right is big of you. These displays cost about 20 cents a piece and anyone who follows along knows this therefore I do not believe you needed to explain the math behind it just to make some moron feel good about himself. It is a very good video despite of why you made it. Trolling someone who is trying to help people is bad practice. You've taught me so much about cmos that I have the utmost respect for you. I think the person who made the comment should start his own channel if he wants to go around flexing his V=IR muscles belittling one of the smartest people I know.
Nice explain with blown off led.
very nicely explained . Thanks!
Nice vid, however the assumption that LEDs have constant internal resistance is incorrect. Depending on the voltage used, the resistance changes inversely in relation to voltage. Some chips such as CD4026 do not require the use of current-limiting resistors since they have internal current regulation.
Greatly explained. Thank you sir.
I need to know why a particular value of capacitor is chosen. 47 or 470 or 4700, for example.
Wish I had watched this before ordering 30 assembled LED display boards with no resistors on the LEDs at all! I thought I could save it by adding a single resistor.... but no.... luckily I can opt to run it at 3V - I think...
hi how are you .you make video how to make ir remote after decode
I'm fine bro, what about you..
Ok, I'll make an ir remote.
LEDs will work fine with 10mA 5mA and 1mA or less. You cant calculate the internal resistens of a LED! if you supply a 3.3 volt LED with enough amps, the LED will take as much current as possible, it will burn through. if more current flows, the lower the resistance of a led, it wants to die! you always need a resistance! if you take a button cell, then this is already the resistance.if you only use one resistor for a seven segment display, then the 8 will be darker than the 1
Basically, user would not want all LED’s blown up.
Ya, so they have to connect 7 resistors.
thanks