little gem 2 question

[newb]

I made 2 little gem's for my friend's chrismas gifts and they loved them. Thank you to run off groove for supplying the plans.  

I am wanting to make a little gem 2 will it work with a 12v supply?
If not does anyone know of where i can find a schematic for a 12v>9v converter circut?


thanks
Scott

[javacody]

Yes, a little gem MKII will work with 12 volts.

[smoguzbenjamin]

If memory serves me correctly, there are LM386 IC's out there that will easily take 18vdc for V+. So you could make an even louder sound if you managed to get it 18v (maybe two 9v batteries in series ). Then again wallwarts @ 18vdc shouldn't be too hard to get

[smoguzbenjamin]

Here:

Battery operation
Minimum external parts
Wide supply voltage range: 4V-12V or 5V-18V
Low quiescent current drain: 4mA
Voltage gains from 20 to 200
Ground referenced input
Self-centering output quiescent voltage
Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ohm, PO = 125mW, f = 1kHz)
Available in 8 pin MSOP package  
[/list:u]

That's national semiconductor's LM 386 specs

[newb]

does anyone have any recomendations on which transistor to use?
im working on a portable 2 channel busker amp for my friends. I plan on using 2 6v lantern batteries but my box has room for three to step it up to 18V thanks for the good ideas ben.

[B Tremblay]

J201, MPF102, 2N5457 will all work fine in the buffer.