9v battery conversion

[fleabag]

I was pondering on using a power pack slipped into a pocket for powering an active bass, instead of using batteries.

 

So the idea is to convert the battery connector to a Boss style 9v female, then a Boss type 9v male to USB, and then to the power pack.

 

Would this work or is there some compatibility issues with mA's or voltage or such stuff ?

 

1:  The 9v battery / 2.1mm female converter

 

 

 

 

 

 

2: Boss type 2.1mm  5v 2000mA   /  USB 2.0

 

 

 

 

Mi.  16,000ma Power pack / USB

 

 

 

 

[tauzero]

The issue is that you'll be trying to power a 9V instrument from a 5V power supply, which is the equivalent of an extremely flat battery. You'd need a power bank with a 9V output on it. I have a feeling that @Smanth found a power bank that does that but I can't find it with a quick search.

[ahpook]

There are doohikies available available to do just this job.

 

https://www.songbirdfx.com/products/birdcord/

 

(Just the first one that popped up btw)

[fleabag]

Yeah i figured something would be amiss  with my config ... cheers Tauzero

 

Ap, that looks like the kiddie - cheers !

[fleabag]

Oooer.. is this the same as the Birdcord ?   It's less than half the price

 

https://www.amazon.co.uk/iGreely-Power-Supply-Cable-Jack/dp/B07JVJ5S2V?th=1

[fleabag]

Even cheaper if it's correct

 

https://www.ebay.co.uk/itm/272430194907

[tauzero]

2 minutes ago, fleabag said:

Even cheaper if it's correct

 

https://www.ebay.co.uk/itm/272430194907

 

That should do the job. It will probably be centre positive which is something to bear in mind with the DC connector to PP3 adaptor. If you have a multimeter it would be advisable to check the polarity is right before applying the power to the bass.

[fleabag]

It's a shame the advert doesnt say  one way or the other

[tauzero]

If it mentions guitar pedal then it'll be for a centre negative connector, like this one: https://www.ebay.co.uk/itm/394854770055

[sandy_r]

4 hours ago, fleabag said:

It's a shame the advert doesnt say  one way or the other

 

Hi

yes, the Ad blurb doesn't mention it but the photo shows that it's centre positive (Red probe to centre, Black to outer, meter reads +9V)

 

HTH

 

Edited September 3, 2023 by sandy_r

[fleabag]

Thanks Sandy - never looked at those, just the ad blurb.  So the 9v battery converter cable to 9v female 2.1mm  ,   that needs to be compatible with 2.1mm 9v pos tip plug

[tauzero]

I expected that adaptor to be centre positive as it's for a variety of purposes and it's Boss who are out of step with the rest of the world with the strange idea of centre negative. It was the other adaptor that I was talking about, that goes from the DC connector to the PP3 clip.

[tauzero]

https://www.ebay.co.uk/itm/393975851286 will invert the polarity if needed. So you either go

 

USB 5V to 9V -> DC connector to PP3 clip

or

USB 5V to 9V -> polarity changer -> DC connector to PP3 clip

 

[ped]

Have a look at these too if you haven’t already

 

https://myvolts.co.uk/page.php?xPage=MV_Ripcord

[sandy_r]

32 minutes ago, fleabag said:

Thanks Sandy - never looked at those, just the ad blurb.  So the 9v battery converter cable to 9v female 2.1mm  ,   that needs to be compatible with 2.1mm 9v pos tip plug

 

Bear in mind that your PP3 connector has to 'look like' a battery as far as the onboard circuit is concerned, so you want your smaller 'complete' circle stud to be +ve and the larger split stud to be -ve - in other words, you will be inverting the polarity advertised for that PP3 adaptor cable ! (just to complicate matters!)

 

If you go for the 5 to 9V USB to DC 2.1 barrel jack converter with a centre positive, you would need a PP3 to 2.1 inline socket with centre negative, if such exists (otherwise insert a polarity changer between the 2 cables as tauzero mentions above)

Edited September 3, 2023 by sandy_r

[Woodinblack]

It would be an easy thing to do, but puzzled as to why do you want to do it in the first place?

[fleabag]

29 minutes ago, tauzero said:

I expected that adaptor to be centre positive as it's for a variety of purposes and it's Boss who are out of step with the rest of the world with the strange idea of centre negative. It was the other adaptor that I was talking about, that goes from the DC connector to the PP3 clip.

 

https://www.ebay.co.uk/itm/393975851286 will invert the polarity if needed. So you either go

 

USB 5V to 9V -> DC connector to PP3 clip

or

USB 5V to 9V -> polarity changer -> DC connector to PP3 clip

 

Yes i did realise but the 9v battery clip converter to 2.1mm female doesnt say it takes pos. tip or neg tip, but that reverse cable in your link

would do the trick !

 

Ped's link also has the converters but again, they dont list neg or pos

 

https://myvolts.co.uk/product/22543/9V_Battery_Snap

 

 

 

 

[sandy_r]

1 minute ago, Woodinblack said:

It would be an easy thing to do, but puzzled as to why do you want to do it in the first place?

 

...spoilsport! 😉

[fleabag]

6 minutes ago, sandy_r said:

 

Bear in mind that your PP3 connector has to 'look like' a battery as far as the onboard circuit is concerned, so you want your smaller 'complete' circle stud to be +ve and the larger split stud to be -ve - in other words, you will be inverting the polarity advertised for that PP3 adaptor cable ! (just to complicate matters!)

 

If you go for the 5 to 9V USB to DC 2.1 barrel jack converter with a centre positive, you would need a PP3 to 2.1 inline socket with centre negative, if such exists (otherwise insert a polarity changer between the 2 cables as tauzero mentions above)

 

 

Arggghhhh!!  

 

 

Edited September 3, 2023 by fleabag

[Woodinblack]

The myvolt adapters are pretty good, I have one. The cheap ebay ones may possibly generate a lot of noise. Bear in mind that any built in pre-amp wouldn't have power conditioning or filtering on the input source like an effects pedal would (why would it, it just comes from a battery), so any noise you generate you will really hear.

[sandy_r]

15 minutes ago, fleabag said:

 

Yes i did realise but the 9v battery clip converter to 2.1mm female doesnt say it takes pos. tip or neg tip, but that reverse cable in your link

would do the trick !

 

Ped's link also has the converters but again, they dont list neg or pos

 

https://myvolts.co.uk/product/22543/9V_Battery_Snap

 

 

 

 

 

Re. Ped's link:-

 

...found this on the SparkFun site re the polarity: "All SparkFun products use a negative 5.5mm sleeve and a positive 2.1mm pin" ie. centre positive

Edited September 3, 2023 by sandy_r

[fleabag]

4 minutes ago, Woodinblack said:

The myvolt adapters are pretty good, I have one. The cheap ebay ones may possibly generate a lot of noise. Bear in mind that any built in pre-amp wouldn't have power conditioning or filtering on the input source like an effects pedal would (why would it, it just comes from a battery), so any noise you generate you will really hear.

 

 

I'll bear that in mind if go ahead.

[fleabag]

3 minutes ago, sandy_r said:

 

...found this on the SparkFun site re the polarity: "All SparkFun products use a negative 5.5mm sleeve and a positive 2.1mm pin" ie. centre positive

 

 

That'll ease things up 

 

[sandy_r]

Stepping back from the converter/ cable issue for a moment...

 

Isn't it rather overkill to use a power bank to power an onboard pre?  (as in - why not just use a PP3 with 2 PP3 to 2.1 adaptor cables 1 xMale, 1xFemale)?

 

or are you going to sneak a 10W Class D amp onboard and plug straight into a bass cab?!?

 

Concerned minds wish to know 😯

Edited September 3, 2023 by sandy_r

[fleabag]

It's only a  little thing that fits in yer pocket

 

https://www.amazon.co.uk/10000mAh-Portable-Charger-External-Battery/dp/B0775P3TF6/ref=asc_df_B0775P3TF6/?tag=googshopuk-21&linkCode=df0&hvadid=231990330909&hvpos=&hvnetw=g&hvrand=17343694284055041676&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1007245&hvtargid=pla-425399751052&psc=1