Control a solenoid with PWM

[Jdog]

Hi, I was wondering if it was possible to control a solenoid valve with a PWM signal so you can vary the pressure that is let through. I have a train horn that I am mounting in a car and I want to be able to control the volume.

[Soeren]

Hi,

I was wondering if it was possible to control a solenoid valve with a PWM signal so you can vary the pressure that is let through.

Yes, that's exactly how a cars electronic fuel injectors (EFI) work.

I cannot guarantee that your solenoid valve will be fast enough (especially the spring return) for serious control though, but OTOH you shouldn't need anywhere near the accuracy of an EFI.

Have you got a link to a datasheet on the valve you wanna use?