Hi everyone,
I've finally invested in an RC20XL - I'm sure the neighbours will be
pleased.  Anyway,  I already have a Boss power adaptor but I'm not
sure what the polarity should be for the pedal.  The adaptor I have is
+ve earth.  Can anyone enlighten me before the free batteries run out.

Thanks in advance,

Alan

wrote in message 
news:03bd37ea-bb72-4175-aced-aab325e01e53@b1g2000hsg.googlegroups.com...
> Hi everyone,
> I've finally invested in an RC20XL - I'm sure the neighbours will be
> pleased.  Anyway,  I already have a Boss power adaptor but I'm not
> sure what the polarity should be for the pedal.  The adaptor I have is
> +ve earth.  Can anyone enlighten me before the free batteries run out.
>
> Thanks in advance,
>
> Alan


All the Boss pedals I've ever come across, and I have more than a dozen, 
have had their power sockets polarised the same way, to suit the relevant 
Boss power supply.  Arguably, having started with 9V DC, positive outer, 
they couldn't really change thereafter or someone would have connected a 
Boss power supply to a Boss pedal and found it didn't work, leading to 
issues/hassle/bad press.  Also, if you look at the circuit diagram of any 
Boss pedal (e.g. http://home.hetnet.nl/~chrisdus/download/ce2.gif look for 
D5) you'll find it contains a series diode to protect against reverse 
polarity - so you're almost bomb-proof anyway!

Now if someone could explain to me why the Digitech EX-7 'Expression 
Factory', and presumably their Hendrix and Maybe pedals based on the same 
chassis, were designed to run on AC power I would be an enlightened geezer, 
coz it seems utterly bonkers to me!

Chris

On 10 Aug, 21:53, "christofire"  wrote:
>  wrote in message
>
> news:03bd37ea-bb72-4175-aced-aab325e01e53@b1g2000hsg.googlegroups.com...
>
> > Hi everyone,
> > I've finally invested in an RC20XL - I'm sure the neighbours will be
> > pleased.  Anyway,  I already have a Boss power adaptor but I'm not
> > sure what the polarity should be for the pedal.  The adaptor I have is
> >  earth.  Can anyone enlighten me before the free batteries run out> > Thanks in advance,
>
> > Alan
>
> All the Boss pedals I've ever come across, and I have more than a dozen,
> have had their power sockets polarised the same way, to suit the relevant
> Boss power supply.  Arguably, having started with 9V DC, positive outer> they couldn't really change thereafter or someone would have connected a
> Boss power supply to a Boss pedal and found it didn't work, leading to
> issues/hassle/bad press.  Also, if you look at the circuit diagram of any
> Boss pedal (e.g.http://home.hetnet.nl/~chrisdus/download/ce2.giflook for
> D5) you'll find it contains a series diode to protect against reverse
> polarity - so you're almost bomb-proof anyway!
>
> Now if someone could explain to me why the Digitech EX-7 'Expression
> Factory', and presumably their Hendrix and Maybe pedals based on the same
> chassis, were designed to run on AC power I would be an enlightened geezer,
> coz it seems utterly bonkers to me!
>
> Chris

thanks Christofire,
a really comprehensive answer.  I had a feeling that it was most
likely diode-protected but thought it wise to enquire.

Thanks again,

Alan

On 11 Aug, 09:45, alan.darling...@marconi.com wrote:
> On 10 Aug, 21:53, "christofire"  wrote:
>
>
>
> >  wrote in message
>
> >news:03bd37ea-bb72-4175-aced-aab325e01e53@b1g2000hsg.googlegroups.com...
>
> > > Hi everyone,
> > > I've finally invested in an RC20XL - I'm sure the neighbours will be
> > > pleased.  Anyway,  I already have a Boss power adaptor but I'm not
> > > sure what the polarity should be for the pedal.  The adaptor I have is
> > >  earth.  Can anyone enlighten me before the free batteries run out.
>
> > > Thanks in advance,
>
> > > Alan
>


The official PSA is the PSA-240 which is 9v collar , centre -ve.

--
Hamish

On 11 Aug, 20:49, Hamish  wrote:
> On 11 Aug, 09:45, alan.darling...@marconi.com wrote:
>
>
>
>
>
> > On 10 Aug, 21:53, "christofire"  wrote:
>
> > >  wrote in message
>
> > >news:03bd37ea-bb72-4175-aced-aab325e01e53@b1g2000hsg.googlegroups.com.> > > > Hi everyone,
> > > > I've finally invested in an RC20XL - I'm sure the neighbours will be
> > > > pleased.  Anyway,  I already have a Boss power adaptor but I'm not
> > > > sure what the polarity should be for the pedal.  The adaptor I have is
> > > >  earth.  Can anyone enlighten me before the free batteries run out.
>
> > > > Thanks in advance,
>
> > > > Alan
>
> The official PSA is the PSA-240 which is 9v collar , centre -ve.
>
> --
> Hamish- Hide quoted text -
>
> - Show quoted text -

Thanks for the info Hamish.

The Boss psu I have is regulated and can supply twice the current
needs of the RC20XL so it seems fine.

Cheers,

Alan