Pwm Ic - Electronic Circuits Projects Diagrams Free

Thunderchild · 12th May 2006, 09:42 PM

I need to PWM audio signals. I've been told there is an ic that will do it: put the signal in and get out the modulated pulses. does anybody know of such an ic and point me to a datasheet ?

thanks

Hero999 · 12th May 2006, 09:44 PM

What do you mean?

Do you want to build an RF or infrared audio transmitter?

Or are you talking about building a class D amplifier?

hotwaterwizard · 13th May 2006, 05:25 AM

Sounds like you want a Class D amplifier.

http://cache.national.com/ds/LM/LM4651.pdf

Here is more info on Class D amplifiers

http://www.analog.com/UploadedFiles/...ev2Jan1106.pdf

http://en.wikipedia.org/wiki/PWM_amplifier

http://www.yamaha.co.jp/english/prod...ine/index.html

http://www.elkraft.ntnu.no/norpie/10...4-paper016.pdf

http://www.imec.be/esscirc/esscirc20...gs/data/62.pdf

Thunderchild · 13th May 2006, 06:41 AM

great, just read the damn question. what is a class D amplifier I only know of A AB B and C. all i want in udio in PWM out just that simple. the 555 should do this but I sdon't think it will work very well and a friend told me there is a specific PWM IC but he couldn't remember the name of it

**Nigel Goodwin** · 13th May 2006, 09:07 AM

Quote:

Originally Posted by Thunderchild

great, just read the damn question. what is a class D amplifier I only know of A AB B and C. all i want in udio in PWM out just that simple. the 555 should do this but I sdon't think it will work very well and a friend told me there is a specific PWM IC but he couldn't remember the name of it

It's easy to do with a few opamps, you just need a triangle oscillator and a comparator, feed the triangle signal into one of the comparator inputs, and the audio into the other - the output of the comparator is a PWM signal.

However, as you won't explain what you're trying to do?, we can't be more explicit - which leads me to believe you probably don't know what you're doing?.

As suggested, try looking at class D (PWM) amplifiers, they use this same technique - which is why it was suggested!.

hotwaterwizard · 14th May 2006, 02:58 AM

Thunderchild you could read what the datasheet tells you and you will see it is what you asked for. http://cache.national.com/ds/LM/LM4651.pdf

You also need to thank someone for trying to help you instead of cussing them out.
You are not a nice person.

hotwaterwizard · 14th May 2006, 03:07 AM

Here is a 555 PWM

Thunderchild · 14th May 2006, 10:43 AM

hey all sorry I was a bit fed up the other day please exscuse me I'm not normally liek that it's just that I seem to run around in blasted circles. As it is so difficult to get parts here in Italy I want to make a generic pw modulator that i can use for anything from motor speed control to audio amplifiers 1 w to 100 watts. that way instead of waiting six months for this IC and that IC i just work out a generic pwm and use the apropriate driving mosfet.

hotwaterwizard, I was thinking of something like that myself but want to make something that can be used in an amplifier as well and maybe as a power supply control.

getting complicated am I well better me than the suppliers. It's hell getting parts in Italy but you try getting them in South Italy thats something the devil himself don't even know about yet

**Nigel Goodwin** · 14th May 2006, 10:58 AM

Quote:

Originally Posted by Thunderchild

hey all sorry I was a bit fed up the other day please exscuse me I'm not normally liek that it's just that I seem to run around in blasted circles. As it is so difficult to get parts here in Italy I want to make a generic pw modulator that i can use for anything from motor speed control to audio amplifiers 1 w to 100 watts. that way instead of waiting six months for this IC and that IC i just work out a generic pwm and use the apropriate driving mosfet.

Not a good idea, they have VERY different requirements, you should build them for their specific use.

Doesn't Italy have a postal service?, parts from all over the world normally only take a few days to reach me in the UK - except for very odd occasions, where I've paid for airmail, it's been dispatched as airmail, and it's been sent surface mail - probably on a pre-WW2 leaking boat!.

Thunderchild · 14th May 2006, 11:13 AM

well ya tou could call it a postal service though it is a bit crappy. but I presume that means buying online with a credit or debit card and thats something I don't trust in italy. better wait till i move lock stock and barrel to england. at the moment a friend that repairs tvs gets me the parts but hell they come by curioir what more than that can u use and they are still slow. it's easier to get free pic samples thru the post (from england) than get a bought ! component from a shop. stitty country and don't ask why u bother being there if you don't like it cause I'm not here for my pleasure but to keep others happy but thats not the topic of this thread anyhow.

hotwaterwizard · 15th May 2006, 02:07 AM

LM4651 is a PWM driver that can be used to drive other components like Mosfet or Standard Transistors etc.

Thunderchild · 15th May 2006, 05:54 AM

hm but what a chaos. i nver seen an ic need so many outside components will have to start studying it

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12th May 2006, 09:42 PM	(permalink)
Thunderchild	Pwm Ic I need to PWM audio signals. I've been told there is an ic that will do it: put the signal in and get out the modulated pulses. does anybody know of such an ic and point me to a datasheet ? thanks __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk

12th May 2006, 09:44 PM	(permalink)
Hero999	What do you mean? Do you want to build an RF or infrared audio transmitter? Or are you talking about building a class D amplifier? __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

13th May 2006, 05:25 AM	(permalink)
hotwaterwizard	Sounds like you want a Class D amplifier. http://cache.national.com/ds/LM/LM4651.pdf Here is more info on Class D amplifiers http://www.analog.com/UploadedFiles/...ev2Jan1106.pdf http://en.wikipedia.org/wiki/PWM_amplifier http://www.yamaha.co.jp/english/prod...ine/index.html http://www.elkraft.ntnu.no/norpie/10...4-paper016.pdf http://www.imec.be/esscirc/esscirc20...gs/data/62.pdf __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

13th May 2006, 06:41 AM	(permalink)
Thunderchild	great, just read the damn question. what is a class D amplifier I only know of A AB B and C. all i want in udio in PWM out just that simple. the 555 should do this but I sdon't think it will work very well and a friend told me there is a specific PWM IC but he couldn't remember the name of it __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk

14th May 2006, 02:58 AM	(permalink)
hotwaterwizard	Thunderchild you could read what the datasheet tells you and you will see it is what you asked for. http://cache.national.com/ds/LM/LM4651.pdf You also need to thank someone for trying to help you instead of cussing them out. You are not a nice person. __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

14th May 2006, 10:43 AM	(permalink)
Thunderchild	hey all sorry I was a bit fed up the other day please exscuse me I'm not normally liek that it's just that I seem to run around in blasted circles. As it is so difficult to get parts here in Italy I want to make a generic pw modulator that i can use for anything from motor speed control to audio amplifiers 1 w to 100 watts. that way instead of waiting six months for this IC and that IC i just work out a generic pwm and use the apropriate driving mosfet. hotwaterwizard, I was thinking of something like that myself but want to make something that can be used in an amplifier as well and maybe as a power supply control. getting complicated am I well better me than the suppliers. It's hell getting parts in Italy but you try getting them in South Italy thats something the devil himself don't even know about yet __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk

14th May 2006, 11:13 AM	(permalink)
Thunderchild	well ya tou could call it a postal service though it is a bit crappy. but I presume that means buying online with a credit or debit card and thats something I don't trust in italy. better wait till i move lock stock and barrel to england. at the moment a friend that repairs tvs gets me the parts but hell they come by curioir what more than that can u use and they are still slow. it's easier to get free pic samples thru the post (from england) than get a bought ! component from a shop. stitty country and don't ask why u bother being there if you don't like it cause I'm not here for my pleasure but to keep others happy but thats not the topic of this thread anyhow. __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk

15th May 2006, 02:07 AM	(permalink)
hotwaterwizard	LM4651 is a PWM driver that can be used to drive other components like Mosfet or Standard Transistors etc. __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

15th May 2006, 05:54 AM	(permalink)
Thunderchild	hm but what a chaos. i nver seen an ic need so many outside components will have to start studying it __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk