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12VDC to 14VAC 50Hz inverter

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SCMatrix

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Hi there :)
I need to build or buy an inverter that transforms 12V DC to 14 AC 50Hz. It's for my guitar sinthetizer, i need to play with it in the street with my 12V batteries. I've tried with an 12V->220AC inverter pure sine (from Velleman) but it introduces to much noise in the guitar.
Any help or ideas I'll be precious.
Thanks,
A. Soares
 

kchriste

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Does your "guitar sinthetizer" have the ability to run on alkaline batteries also? If so, a simple linear regulator might be all you need.
 

Hero999

Banned
It probably needs AC to get a bipolar DC supply.

You'll need a boost converter to get 20V from the 12V supply and an H-bridge to convert it to a modified sine wave.

How much current does it use?

I doubt the inverter you used was a pusre sine wave, it sounds more like a modified sine wave, from what you've said, a pure sine wave inverter shouldn't make any noise.

The method described above might give you the same problem as the inverter you tried.

For a sine wave, it's much more complicated you'll need to convert 12V to 24V (a bit higher than the peak voltage of a 14V sine wave) then use a bridged class D amplifier to get a 50/60Hz sine wave.
 

SCMatrix

New Member
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Hi there :)
Kchriste: of course it has the ability to run on alcaline batteries, connecting alcaline batteries in series (+14 and -14Volts) in the printed circuit board ...

Hero999: I think you're right.
Thanks for your help.
I've been with a friend, electronic expert. And he said that the my sinthetizer Boss GR20 has DC after the bridge (+12V and -12V).
I'm going to try this weekend with two batteries connected to the right points in the PCB.
Greetings :)
 

Hero999

Banned
Hero999: I think you're right.
Thanks for your help.
I've been with a friend, electronic expert. And he said that the my sinthetizer Boss GR20 has DC after the bridge (+12V and -12V).
I'm going to try this weekend with two batteries connected to the right points in the PCB.
Greetings :)
If you can get inside the enclosure and connect the batteries directly to the PCB then all the better - no inverter to worry about.

You might need more than 12V though, you might need 15V for it to work properly.
 
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