I have an intelligent switch. Let's take this one as an example - it's the one I'm plan on using, unless I find a better one. What I need to do is drive it by the voltage from the car's power grid. There are two complications here:
- I'd like to get 3.5-5 volts at the input of the switch, but I have no other voltage source to clamp the input to with a diode.
- Whatever schematic you suggest must withstand voltage pulses up to at least 60V (better yet - 100), and keep in mind the pulses may have reverse polarity as well.
What are the simplest solutions you can think of?
I've been thinking along the lines of a high-resistance voltage divider + a suppressor diode or a Zener diode. But I have no idea if it will work, let alone - work reliably. Please keep in mind I'm not an electrical engineer, and don't beat me up if I ask how your solution works.