need help from the electrical lads!

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   I have a small non audio related project going... but it seems something from the world of sound has come up in my project.

a Pulse Width Modulator is what i need to be precise.

how difficult would it be to design/build a PWM for 0.5amp to 15amp at 12v operation targeting adjustable frequencies from 10,000hz to 47,000hz? power supplied is 12v DC current from a car battery/alternator *so that means 10v - 15v tolerances*.

any advice to this at all?

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Jay Lawless Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 22 August 2005 Location: United States Status: Offline Points: 1702	Post Options Post Reply Quote Jay Lawless Report Post Thanks(0) Quote Reply Topic: need help from the electrical lads! Posted: 19 October 2007 at 10:35am
	I have a small non audio related project going... but it seems something from the world of sound has come up in my project. a Pulse Width Modulator is what i need to be precise. how difficult would it be to design/build a PWM for 0.5amp to 15amp at 12v operation targeting adjustable frequencies from 10,000hz to 47,000hz? power supplied is 12v DC current from a car battery/alternator so that means 10v - 15v tolerances. any advice to this at all?
	Previously known as NeverWinter Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist

tommysb Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036	Post Options Post Reply Quote tommysb Report Post Thanks(0) Quote Reply Posted: 25 October 2007 at 11:21am
	What are you doing with it? My housemate built one in an afternoon. Can't be that hard! If you're modulating a signal, you compare the signal to a sawtooth wave. If you're just using it to control rate or something, well i suppose it's the same actually, but just vary the triangle wave frequency or the level going into the comparator. I'd do it as a 2 stage thing, get the pwm signal at low level, then amplify it. No reason for this, other than it'd be easier to test/prototype.