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need help from the electrical lads!

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Jay Lawless View Drop Down
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Joined: 22 August 2005
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    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
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tommysb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post 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.
 
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