Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
steev said:hmmm
this i have to see.if the front and back lamps are connected in parallel then it will the good for me.i can connect this circuit in parallel.
if they are in series then i shld think what to do.
steev said:give me some time guys.i got all of the components(with exact zener ratings).tomorrow i'll populate then and wll post the results.
any formula to calculate the requited resistance value? to compensate the load
Darth Bagel said:Can somebody explain to me why this circuit wouldn't work in parallel with one or both of the lamps? I can understand that the current draw might have an effect on the flash rate of the turn signal, but that's about all I can come up with.
steev said:i populated the circuit on pcb board,it worked but not similar in all the times.when the engine is at a particular RPM they LIT fast and the RPM is low they lit slow.
may be this is what "roff" said.
@roff
ur LM3914 circuit looks good.but i don't understand how the cycle starts and ends.is it gona give me the exact pattern?imean 1+2+3+4+5.....
Roff said:Here is the simulation of Ferreira's circuit. I tweaked the value of R13 to give the best spacing I could achieve. I also had to guess at the pulse width and duty cycle of the turn signal "relay".
I have attached the LTspice file in case someone wants to run the simulation.
It should do what you want, and it will run the same sequence each time the power comes on.steev said:i populated the circuit on pcb board,it worked but not similar in all the times.when the engine is at a particular RPM they LIT fast and the RPM is low they lit slow.
may be this is what "roff" said.
@roff
ur LM3914 circuit looks good.but i don't understand how the cycle starts and ends.is it gona give me the exact pattern?imean 1+2+3+4+5.....
The emitter followers (or diodes) and the current source solves that problem.Helder Ferreira said:The only way to tune each led would be using 5 voltage deviding trimmers and the same value zener for all the nodes. This way you could set the trigger voltage of each node.