Ok looking for some confirmation here, but my knowledge of microelectronci circuits isn’t great.

I want to buy this looper pedal for my bass link to 9mb pdf of digitech jamman solo on page x it lists the output of the included power supply as 9.6VDC 300mA , so is there anything stopping me from just make my own external battery supply using a 9v battery? (its to make the device portable you see)…

Shouldn’t be. The only thing to note would be to use decent 9V batteries as a cheap PP3 is likely to die quite quickly. (Disclaimer: haven’t actually read the datasheet).

yes it would work, but prob not for very long. IF the device was consuming the full 300mA, and 175mAh is typical for a 9v PP3 rechargeable battery (quick google is where I got that number from), then you’d be looking at about half an hour assuming near perfect effieciency. Would be more like 15 mins in reality in my experience.

Of course, I doubt the device will be consuming the full 300mA, so you’ll prob get longer. So in summary… yes it will work, but for how long is not known!

EDIT – I’d go for NIMH batteries for their potential high discharge rate compared with alkaline.

No reason at all apart from it going flat. From memory, a typical 9v batter gives about 0.5Ah (amps per hour) so you could only give you 300mA (0.3A) for about 100minutes. You could parallel a few batteries together to increase this.

Thanks chaps. I was thinking of paralleling a few batts anyway because of the life issue. Ok thats enough to convince me that I could make a portable solution if needs be..

There is a competitor product you see, which has a battery, but it’s other features are not so good..

I would have a look at argos or amazon for a NIMH recharge-able battery.

http://www.amazon.co.uk/s/ref=sr_nr_scat_431411031_ln?rh=n%3A431411031%2Ck%3A9v+battery&keywords=9v+battery&ie=UTF8&qid=1335363111&scn=431411031&h=26682dcf100f331eb01635f9ce4c3ad8cbb7e4de

300mah would give you 300ma for 1 hours use if the device is rated 300ma.

Plus they dont have the memory effect of the old nicads

I wouldn’t use a PP3 style battery due to cost and capacity.

I would get one of these and put AA style batteries in: http://www.maplin.co.uk/aa-size-battery-holders-31427

If you use a PP3 rechargeable then it will only put out about 7.2V. If you use 6x normal AA it will be 9V but 6x rechargeable will be 7.2V also as they are a nominal 1.2V. But they may work. 6x NiMH AA batteries will have a good mAh rating.

just spotted these rechargeable AAs with 1.6V output though which would give you 9.6V exactly if using 6: http://www.maplin.co.uk/nickel-zinc-aa-rechargeable-batteries-4-pack-624782

Typical AA NiMH: http://www.maplin.co.uk/extra-high-capacity-rechargeable-batteries-45787

All links intended as examples, not tried any of the above.

andyl, you are a legend, gent and a scholar. Thank you. Next I’m fantasising about a custom power supply charger thingy so I can just plug in to my battery unit and it will give either me power to the pedal and or recharge the batts..
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Whislt I’m dreaming I’d like a flamethrower, sherman tank, a harrier, and a fleet of minimotos and my own indoor racetrack..