Something like this:

^{simulate this circuit – Schematic created using CircuitLab}

Are you actually PWM'ing?
Why relay?
Why not FET?

Something like this:

^{simulate this circuit – Schematic created using CircuitLab}

Are you actually PWM'ing?
Why relay?
Why not FET?

Something like this:

^{simulate this circuit – Schematic created using CircuitLab}

Something like this:

^{simulate this circuit – Schematic created using CircuitLab}

Are you actually PWM'ing?
Why relay?
Why not FET?