Pulse Width Modulation Supply

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I'm looking for a pulse width modulator ranging up to about 20khz with
at least 28VDC output supply. Could someone focus my search or
suggest possible company products that I should look for? I'm not
very familiar with electronics, so any help would be appreciated. Do
I need to get an amplifer and a PWM to get what I want? Or are there
'packages' out there?
Thanks.

 

A little more info on what you want the PWM to do, would be helpful.

Gary

 

I'm looking to have the PWM module output a pulse of 30VDC to
oscillate a solenoid driven device. I need it to vary from very low
frequencies up to probably 10kHz. This will probably require an
independent power source.