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Old 14th January 2010, 09:55 PM   #1
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Default 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.
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Old 14th January 2010, 10:02 PM   #2
jaycee is offline jaycee  United Kingdom
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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.
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Old 14th January 2010, 10:26 PM   #3
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What about these chips: opa541 / opa549 / opa548?

Last edited by irishpatrick33; 14th January 2010 at 10:45 PM.
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Old 14th January 2010, 10:50 PM   #4
star882 is offline star882  United States
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Quote:
Originally Posted by jaycee View Post
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.
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Old 14th January 2010, 10:51 PM   #5
Minion is offline Minion  Canada
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Maybe try the TDA1562 ......

http://www.datasheetcatalog.org/data...ps/TDA1562.pdf
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Old 14th January 2010, 11:02 PM   #6
paulb is offline paulb  Canada
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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.
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Old 14th January 2010, 11:02 PM   #7
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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.
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Old 15th January 2010, 07:35 AM   #8
jaycee is offline jaycee  United Kingdom
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Quote:
Originally Posted by star882 View Post
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.
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Old 15th January 2010, 08:10 PM   #9
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Quote:
Originally Posted by jaycee View Post
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.
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Old 15th January 2010, 08:33 PM   #10
wahab is offline wahab  Algeria
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Quote:
Originally Posted by irishpatrick33 View Post
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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