eyhonda
Coast to Coast
I just built a simple turn signal controller. Easy to build inside an hour. It is made up of a 555 timer (8 pin dual inline IC), two resistors, a cap and a small relay. I doubled this for one left and one right. It fits in a small box of 2" x 2.5" x 1.5" high. The timer is in astable mode. Basically, when I power it, it puts out a self-triggered square wave. A 10k and 20k resistor along with a 10uf cap produces about a 1 hertz signal. It can be changed with different resistor values. Now, I can use LED turn signals without load resistors. LED turn signals with load resistors defeat the advantage of low current draw.
The 555 timer datasheet is here:
https://www.national.com/ds/LM/LM555.pdf
The 555 timer datasheet is here:
https://www.national.com/ds/LM/LM555.pdf