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13th September 2004, 03:30 PM
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#1 |
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diyAudio Member
Join Date: Sep 2004
Location: Israel
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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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13th September 2004, 04:51 PM
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#2 | |
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diyAudio Member
Join Date: Mar 2001
Location: Brazil
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Re: hi - LM3876 problems...
Quote:
Look up for single-supply designs on the datasheet: use those. Carlos E. Martinez |
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13th September 2004, 08:31 PM
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#3 |
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Electrons are yellow and more is better!
diyAudio Member
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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.
__________________
/Per-Anders (my first name) or P-A as my friends call me |
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14th September 2004, 03:28 AM
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#4 |
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diyAudio Member
Join Date: Sep 2004
Location: Israel
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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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14th September 2004, 01:04 PM
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#5 |
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diyAudio Member
Join Date: Mar 2001
Location: Brazil
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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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14th September 2004, 04:32 PM
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#8 |
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diyAudio Member
Join Date: Feb 2003
Location: Somerset, SW England
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__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant. |
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