marvin.the.robot
New Member
Hi,
I've only recently started playing with logic circuits.
I'd just like to find out if I've missed anything here.
Circuit Diagram
What I'm trying to achieve
I'm trying to make and array of LED's that chase up to the end of the line and then chase back (a bit like knight rider) with controls for the amount of array's to be switched on and the speed that the light moves along the line and a trigger to start the chase.
due to wiring limitations and the fact that I want to be able to add more LED's this method I believe will have the least amount of cable running from the controller to the LED's.
if anyone has any pointers as to improve on this please let me know.
Do I pull down all unused outputs on TTL's or does that rule only apply to inputs?
Q1 and Q3 goto a diode each then go through a resistor, will this cause a higher voltage or damage the transistor at all if both Q1 and Q3 are high? or should I put the resistor behind each diode?
Should I put filtering caps on the TTL's? if so where and what value?
Thanks in advance for your help,
marvin.the.robot
I've only recently started playing with logic circuits.
I'd just like to find out if I've missed anything here.
Circuit Diagram
What I'm trying to achieve
I'm trying to make and array of LED's that chase up to the end of the line and then chase back (a bit like knight rider) with controls for the amount of array's to be switched on and the speed that the light moves along the line and a trigger to start the chase.
due to wiring limitations and the fact that I want to be able to add more LED's this method I believe will have the least amount of cable running from the controller to the LED's.
if anyone has any pointers as to improve on this please let me know.
Do I pull down all unused outputs on TTL's or does that rule only apply to inputs?
Q1 and Q3 goto a diode each then go through a resistor, will this cause a higher voltage or damage the transistor at all if both Q1 and Q3 are high? or should I put the resistor behind each diode?
Should I put filtering caps on the TTL's? if so where and what value?
Thanks in advance for your help,
marvin.the.robot