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Old 30th June 2012, 04:15 AM   #41
MarianB is offline MarianB  Romania
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It's been about 15 years ever since i have been infected with the electronics virus and in all that time i don't think i've met anyone quite like you @lazzer408, maybe that says it all..

You keep asking about the best that, the highest other and blame us for arguing about the power output when in fac we should unswear youre question, but you stubbornly do not got it that in normal calss of opperation AB no matter what IC you use the power cannot be more that 10W SE and 20W BTL, so it really does not matter what IC you choose, they all do the same thing, they all have the same maximum possible power so you choose whatever you want, as @theAnonymous1 says, i give up and you can learn about the bassics of audio electronics ( of wich you have absolutely no ideea ) from books of whatever source you like, fact is you need it.

Good luck.
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Old 30th June 2012, 04:52 AM   #42
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Why are some rated at 14.4v 5w or 7w or 10w? I'd guess anything lower then 10w may just have a lower fixed gain? Do you know of any simple 20x20x20w BTL ICs?

I've been 'infected' since age 5 but the only audio amp I've built from scratch was tubed unless you consider a 144kw motor controller an amp. I did slap together a TDA1517 yesterday as my first IC amp. Sounds ok but there's not much to the design. 5 caps, the IC, and a stereo pot. Impressive for it's size though.

I have a very large understanding of electronics for someone who's never taken classes on it. I've built alot of things. Here's a pic of my board layout for a quad comparator based PWM front end (to the motor controller I mentioned) FROM SCRATCH. Has oscillator, PWM comparator, throttle buffer, open throttle shutdown, throttle ramp, power-up throttle disable if >5%, and current limiter all out of one quad comparator. All off self-taught knowledge.

Please don't belittle my understanding of electronics just because I didn't immediately grasp the concept of an SE audio IC's output swing.

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Last edited by lazzer408; 30th June 2012 at 05:00 AM.
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Old 2nd July 2012, 04:46 AM   #43
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So I decided to do a SG3524 based push-pull boost converter with a pair of audio ICs. One stereo BTL to the fronts and a mono BTL for the sub. Now I need to find a nice pair of split-rail ICs and cram it all in a long skinny extruded enclosure.
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Old 2nd July 2012, 09:47 AM   #44
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This is what I have so far. It's 4" x 2.3". With the right mosfets and xformer it might be good for 150w or more if I don't blow the traces off.

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Old 2nd July 2012, 10:07 AM   #45
MarianB is offline MarianB  Romania
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SMPS units are not that easy to built and even harder to desighn, there are many variables that can go wrong or contribute to bad results, and as i see your desighn still needs work, and maybe you need more studdying on this matter, but here is a suggestion for a SMPS unit desighned by me, maybe it will help you.
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File Type: pdf PCB - Dispunere componente.pdf (77.9 KB, 6 views)
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Old 2nd July 2012, 11:01 AM   #46
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Since I don't consider myself an audiophile (can't afford to be), and it's for a motorcycle, I can leave out quite a few things that one might normally find in a quality SMPS like proper filtering, proper gate drive, regulated vcc, ect. The gates should at least have some 100k or so to ground to keep them off should the PWM IC fail. I won't hear any noise it may create anyway. It will get the job done if I can build it on perfboard.That's why the layout is fairly "squarish". I couldn't etch a PCB to save my life. I don't know where to find xformers either. I'll just wind my own.

As far as PWM goes, I've made many motor controllers that worked well. When you have 120v@500a you can't afford to screw it up.

Why did you choose to use a totem over a driver IC? Also, I don't see current limiting or voltage regulation. Didn't need it?

I also have my IC mislabled as a 3525. It's a 3524. I already know I have gate drive issues. -doh-

Last edited by lazzer408; 2nd July 2012 at 11:18 AM.
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Old 2nd July 2012, 11:05 AM   #47
MarianB is offline MarianB  Romania
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Quote:
Originally Posted by lazzer408 View Post
...The gates should at least have some 100k or so to ground to keep them off should the PWM IC fail....
Are you talking about my desighn here?

PS; Stop editing your post ( u're not making much sense ) and answear my question here.
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Last edited by MarianB; 2nd July 2012 at 11:24 AM.
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Old 2nd July 2012, 11:38 AM   #48
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No, not in your design. You have parallel 10k on your gates. I was saying I need some in mine. I don't have any. After looking at the 3524 again, I forgot it's not a totem output so I'll need to add a gate driver circuit or driver IC.
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Old 2nd July 2012, 11:44 AM   #49
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In your design, what are R4-7 for if you have R8 and R10 for gate ringing?
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