Hi, Thanks for the diagram. Can you explain the switch logic as I was hoping to use a momentary switch to initiate the counter. In addition a high from the brake light switch would keep the indicators running until it goes low and then timer count would start again.The conversion is not a problem. A zener diode with a resistor or a resistor divider on the power supply can easily solve that.
The voltage can rise, thats why I have noted it in the circuit before. But you have to check if the place from which you take the power supply has a regulator for "12VDC" or not. If it does not, it will be necessary to add a limit.
Please check the circuit I gave and see if it suits your needs. There is a switch on the power supply to account for turning off the timer when needed.
Not if its a falling front timer 555. Then it will be activated when the power supply is removed.Nope, 555 will trigger as soon as power is supplied (if that is how you plan to reset).