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-   -   12V DC gainclone? (http://www.diyaudio.com/forums/chip-amps/158644-12v-dc-gainclone.html)

irishpatrick33 14th January 2010 09:55 PM

12V DC gainclone?
 
Hello,

My desire is to build a gainclone. But I am making it even harder on myself. It must be powered by 12V DC if possible. I have done searching and seen people talk about it. But I haven't seen any schematics or how-to's.

Does anybody have any info or such that would point me in the right direction? To make matters worse I am a complete novice. So please forgive my ignorance.

jaycee 14th January 2010 10:02 PM

Not direct possible. Even with a single rail supply, the LM3886 needs at least 20V to operate.

If it's for a car then you would have to build a stepup supply - not a task for a novice.

irishpatrick33 14th January 2010 10:26 PM

What about these chips: opa541 / opa549 / opa548?

star882 14th January 2010 10:50 PM

Quote:

Originally Posted by jaycee (Post 2048004)
Not direct possible. Even with a single rail supply, the LM3886 needs at least 20V to operate.

If it's for a car then you would have to build a stepup supply - not a task for a novice.

It's very easy to build a boost converter.

Minion 14th January 2010 10:51 PM

Maybe try the TDA1562 ......

http://www.datasheetcatalog.org/data...ps/TDA1562.pdf

paulb 14th January 2010 11:02 PM

LM4752
LM4752 - Stereo 11W Audio Power Amplifier
Not in the same distortion class as the LM3886 and similar, but I'd still call it a gainclone. Sounds good.

irishpatrick33 14th January 2010 11:02 PM

I just found this site: http://matttcattt.co.uk/

His HiFi page contains information regarding this. I spoke to him and he mentioned using the OPA548/549.

Here was his suggestion "If using a single ended power supply you would have to hold the (negative) side of the speaker at +4v to give the +ve and -ve swing required."


It seems like this might be the best info out there. He seems to be the one person in the world doing this.

jaycee 15th January 2010 07:35 AM

Quote:

Originally Posted by star882 (Post 2048048)
It's very easy to build a boost converter.

If you have experience - if you don't and it's for a car, there is dangerous current involved that can melt and burn anything and start fires in a fraction of a second.

If you were going to go this far, you'd want to build a symmetric supply, which means winding a transformer, and also requires a 'scope for setting dead time.

irishpatrick33 15th January 2010 08:10 PM

Quote:

Originally Posted by jaycee (Post 2048413)
If you have experience - if you don't and it's for a car, there is dangerous current involved that can melt and burn anything and start fires in a fraction of a second.

If you were going to go this far, you'd want to build a symmetric supply, which means winding a transformer, and also requires a 'scope for setting dead time.

I will not be making a boost or DC-DC converter.

wahab 15th January 2010 08:33 PM

Quote:

Originally Posted by irishpatrick33 (Post 2048022)
What about these chips: opa541 / opa549 / opa548?

too much distorsion with these devices..
a TDA2040 would work quiet well, as its minimal
ps is 7 V in single rail, but at 12V , the power would be not
very high, although enough for domestic use...


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