thejuggla1
New Member
Ok so I am modifying this
https://www.qsl.net/yo5ofh/hobby circuits/circuit pictures/traffic.gif
As it shows only 1 'set' of Red Yellow and Green LEDs for 2 directions, I want to make it 4. I am not sure if adding more LEDs changes any of the resistor values or not and would like some help with that. I have modded it into 2 possible Schematics that I hope are right.
First one
https://i233.photobucket.com/albums/ee268/Allan-2greasy/TrafficLightsMod.jpg?t=1263104616
I just basically duped N/S and E/W but I believe there is a way to do it that will use less parts....
2nd Diagram, if my logic is correct(I am pretty sure, but then again I have no idea...) then this should be a cheaper and more efficient way of doing this.
https://i233.photobucket.com/albums/ee268/Allan-2greasy/TrafficLightsMod2.jpg?t=1263104753
First thing I just noticed is I got a ground sign overlaping the set of diodes, just ignore that I got it uploaded already don't want to reupload.
Anyways with this here I believe I can bypass the extra set of transistors saving me some time and money, am not 100% if this works and I also have no idea what the new resistor values should be. I am thinking the 2 red LEDs will be a problem, should I series them?
One thing why I am having troubles calculating the LED voltage is, I really don't know what voltages comes out of the 4017 or the 555, is it 9Vs all around the diagram? Do I calculate the LED's resistors like I normally would off a 9V circuit then?
https://www.qsl.net/yo5ofh/hobby circuits/circuit pictures/traffic.gif
As it shows only 1 'set' of Red Yellow and Green LEDs for 2 directions, I want to make it 4. I am not sure if adding more LEDs changes any of the resistor values or not and would like some help with that. I have modded it into 2 possible Schematics that I hope are right.
First one
https://i233.photobucket.com/albums/ee268/Allan-2greasy/TrafficLightsMod.jpg?t=1263104616
I just basically duped N/S and E/W but I believe there is a way to do it that will use less parts....
2nd Diagram, if my logic is correct(I am pretty sure, but then again I have no idea...) then this should be a cheaper and more efficient way of doing this.
https://i233.photobucket.com/albums/ee268/Allan-2greasy/TrafficLightsMod2.jpg?t=1263104753
First thing I just noticed is I got a ground sign overlaping the set of diodes, just ignore that I got it uploaded already don't want to reupload.
Anyways with this here I believe I can bypass the extra set of transistors saving me some time and money, am not 100% if this works and I also have no idea what the new resistor values should be. I am thinking the 2 red LEDs will be a problem, should I series them?
One thing why I am having troubles calculating the LED voltage is, I really don't know what voltages comes out of the 4017 or the 555, is it 9Vs all around the diagram? Do I calculate the LED's resistors like I normally would off a 9V circuit then?
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