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Old 13th September 2004, 03:30 PM   #1
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Default hi - LM3876 problems...

hi all !

I've got the LM3876 (56w) ampli chip.

it needs arround 30v,

I'd like to know if i can power it by just +30v and GND (without -35v).....

I tried without connectig the -v Pin, but it doesnt work...

please help

Thanks !
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Old 13th September 2004, 04:51 PM   #2
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Default Re: hi - LM3876 problems...

Quote:
Originally posted by RichardA
hi all !

I've got the LM3876 (56w) ampli chip.

it needs arround 30v,

I'd like to know if i can power it by just +30v and GND (without -35v).....

I tried without connectig the -v Pin, but it doesnt work...


The -V pin should be connected to ground. At the output it's a must to use a large capacitor, and a resistor divider at the input.

Look up for single-supply designs on the datasheet: use those.


Carlos E. Martinez
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Old 13th September 2004, 08:31 PM   #3
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RichardA, 30 volts is a bit little. You won't get much power out of it, around 8-9 Vrms only.
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Old 14th September 2004, 03:28 AM   #4
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holy ****....

it have just blown up,
all room is now full of smoke

Where do you want me to get from +-35v ?!?!?!
fortunately I found 2 30v transformers, so i have +-30v...
but it just exploded...

I think i will try with TDA2004/2003, dont remember...
they, at least, work with 12v, so i can supply them up to 50Amps and 300W...

Avner
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Old 14th September 2004, 01:04 PM   #5
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RichardA,


How much experience do you have in doing DIY audio work or in reading schematics?

Perhaps you should start with simpler designs that you can set going (amplifying) instead of higher voltage designs.

From your mails you don't seem to know what a single supply and dual supply power is, and you may run a higher risk if you got a room full of smoke with this project.

Even if burning things up is something that comes with DIY audio, things can get dangerous in some circumstances, particularly with large capacitor exploding. Don't forget to wear safety glasses.

Sorry if I sound too paternalistic or exaggerated, but if by this you can avoid some perils it's all for the best.

My advice is to start with some nice 12v car amps and learn from that. Get pcbs kits for your projects, don't do point to point wiring until you are well experienced. After a few working projects, go up to the ladder to dual supply amp, and so on.

Good luck!



Carlos
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Old 14th September 2004, 01:07 PM   #6
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OK..


Thanks !!!

any reccomendation for a chip using only +12v ??


Avner
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Old 14th September 2004, 03:34 PM   #7
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Find a project with the TDA1553Q or a similar chip.



Carlos
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Old 14th September 2004, 04:32 PM   #8
Nuuk is offline Nuuk  United Kingdom
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Quote:
any reccomendation for a chip using only +12v ??
Avner, have a look here for some ideas.
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