battery 9v

[Guest ignamato]

Can I use a 9v battery for the MIDIBOX64??

[Steven_C]

Ignamato-

it will go flat too quickly. (maybe after an hour or less)

I successfully used (6x) AA batteries, and my MB64 also had a backlit 2x16 LCD. This lasted about 12 hours continuous use, but I never actually timed this!

[pay_c]

I already wrote something about that, here I go once again:  ;D

NiMH Accus:

9V ~150mAh

4x (or 6x) AAAs ~700mAh

4x (or 6x) AAs ~2000mAh

A normal MB64 (with all backlight and stuff) uses about 200 - 500 mA (the MOST goes into the Backlight).

You just have to divide the mAh through your current and know how long your Box will be on. So with a 9V Accu it's gonna be even less than an hour!

So: Current saving! Cut off the backlight! This saves a LOT!

Second: Use low current LEDs (they just need 3mA to light up) - you got to change the values of the resistors on the DOUT (appr. 1k - 1,6k instead of 220)!!

That way you can go down to about 100 mA current or even less (very dependable on the number of lighted LEDs)!

That makes about: 9V: 1,5h, AAAs: 7h, AAs: 20h (!!!)

To go even higher, just put 4x or 6x batteries in row (6V,9V)  and parallel to those again 4x or 6x batteries - doubled mAh. (e.g.: 2 times 4x AAAs in parallel makes 6V at 1400 mAh)

Greets!  :)

P.S.: Perhaps something for the FAQ?