Using a 12v battery as DC for Boss rc3 loop pedal
Jack Jarmush
After frying one Boss rc2 loop pedal by accidently plugging in the
wrong adapter with the wrong polarity (i know) i had to buy a new rc3
loop pedal (200euros). I was using a 12v, 7Ah motorcycle battery to
power the 9v loop pedal via the DC in and using a daisychain to also
power a 9v behringer preamp pedal (both negative polarity). I also had
a positive polarity wire from the battery to power my 12v amp. This
was working fine until last night when the loop pedal stopped working
from the 12v battery, it will work with an internal 9v battery and
with a 9v, 2A power supply plugged into the wall. The 25euro Boss
power supply that is made for the loop pedal with output 9v, 200mA
works also when i tested it in the store but didn't buy it because it
costs 25euros!
This pedal uses up 9v batteries very quickly so that and convenience
is why i want to use the 12v motorcycle battery for outdoor gigs.
Do any of you have an idea why this set up stopped working ?
advise greatly appreciated,
thanks
JJ
Gareth Magennis
"Jack Jarmush" <r...@radiorob.com> wrote in message
news:45b44f14-8b27-4620...@m22g2000yqh.googlegroups.com...
My guess would be the DC connector you have connected to the battery.
Either a connection has come off it or it is the wrong size.
There are several different DC connector sizes, the most common being 2.1mm
and 2.4mm. (the size of the hole in the plug and the pin of the socket).
If you use a 2.4mm plug into a 2.1mm socket it may sometimes connect, but
often will not.
Gareth.
Bill Graham
Around these parts, the guys who play gigs at our Saturday Market frequently
use a Honda gasoline powered generator that put out a line voltage (mains)
power source that is unbelievably quiet in its operation. It sits only about
30 feet away from their stage, and you can hardly hear it unless you are
sitting very near it.
Mark
wrote:
if you have two devices, one that uses negative ground and one that
uses positive ground and you connect the grounds together (as when
when you connect an audio cable from one to the other) and they are
both powered from the same battery....
that equals a SHORT.
think about it.
Mark
Dave C
"Jack Jarmush" <r...@radiorob.com> wrote in message
news:45b44f14-8b27-4620...@m22g2000yqh.googlegroups.com...
Hi Jack,
From your description it seems you have a potential
earthing/common conflict. If you have both negative and positive "earth"
devices connected to the same single rail 12V supply then there is a
possibility of instant short (depending on the internal configuration of the
devices), or generating a short later when things plugged into these
"devices" come into contact during the gig. Hard to advise from afar on the
best course of action, but keeping to your current (sic) solution, a second
battery for the "other" polarity device will probably work.
Dave
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Gareth Magennis
"Mark" <mako...@yahoo.com> wrote in message
news:c08e5877-8b0a-44aa...@ct4g2000vbb.googlegroups.com...
I doubt it in this case. The OP says the system was working but suddenly
stopped.
Although the amp seems to use a different "polarity", it will still most
likely have the negative terminal connected to ground. It is just how the
DC socket is wired that is different to the pedals.
Gareth.
Jack Jarmush
wrote:
>
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I don't think it's the connector because it worked before and the
other pedal works with the same connector,
Gareth Magennis
"Jack Jarmush" <r...@radiorob.com> wrote in message
news:ef1e9baf-b0e7-46de...@j15g2000yqf.googlegroups.com...
Try wiggling it.
And maybe re-read my post.
Gareth.
Jack Jarmush
>
> - Show quoted text -
I don't think it's the connector because it works on the other pedals
i use.
Jack Jarmush
test
Gareth Magennis
"Jack Jarmush" <r...@radiorob.com> wrote in message
news:ba63e8fa-69b8-4145...@m22g2000yqh.googlegroups.com...
Jack, as I understand it:
1. The connector works on other pedals therefore it works.
2. An external power supply will power the pedal
3. However the connector will not power the pedal.
The only way this can make sense is what I have described - that the
connector is the wrong size for the pedal.
If the connector has a 2.4mm hole and the pedals socket has a 2.1mm pin, it
is entirely possible that the pin will not make contact with the inside of
the connector. I have seen this happen many times on my bench, which is
why I have a bench power supply ending in a 2.4mm plug, and a 2.4mm socket
to 2.1mm plug converter.
Gareth.
Bill Graham
Well, 12 Volts is a 33% overvoltage for a nominal 9 Volt circuit, so maybe
you just fried something. I know that I am afraid to use that much
overvoltage on something real expensive, like my camera. I bought a little
module that converts anything between 8 and 18 volts to 12 volts so I can
drive my camera with my auto cigarette lighter. Sometimes it can get over 14
volts when the battery charger cuts in, and I didn't want to smoke a $2000
camera. The little module only cost me $30.
Jack Jarmush
>
> - Show quoted text -
I don't think it's the connector because it works with other pedals.
Jack Jarmush
>
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solved- the plug was gummed up, cleaned and now works again.
Jack Jarmush
>
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problem solved, there was something stuck in the plug, some plastic
gunk from a bad connector
Jack Jarmush
>
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thanks for the good advise and sorry about my mutiple posts, for some
reason it took 3 days to post ..