thanks, rory. i very much appreciate your replies.
i'm afraid i wasn't specific enough in my description of the mod. the negative pole of the capacitor i am connecting to is already on the main
circuitboard. between that capacitor and the positive center of the input jack, there is to be installed a length of wire and a .47mf cap. and that's all
there is to it, except for scraping away the trace coming off the center of the input jack in order to disconnect it from the output. the mg-1 has stereo
rca inputs which are routed directly to the outputs. the apparent intent was to enable a connection to a home stereo for jam-along funtimes. so the input
filter mod routes the input signal through the filter instead of sending it straight to the ouput. being a korg x911 enthusiast, i'm excited to put the
mg-1 to similar use. maybe i'm being a little overcautious, but i just scored this sweet thing. i love the sounds and don't want to do any damage.
shayne
> Well I am definitely no expert on this, but no one else has answered you
> besides me so:
> If your instructions say "come off the negative pole of a capacitor" then I
> would assume an Electrolytic since ceramics dont have neg/positive leads.
> Pick a electrolytic that has a voltage rating above that of the voltages at
> the circuit.
> So if +15v is going thru the circuit at that point, perhaps a 25v rating on
> the cap.
> SOMEBODY STOP ME IF I AM WRONG ON THIS!
> Rory
> Oldsynths Moderator
>
> -----Original Message-----
> From: Shayne Cafferata [mailto:scafferata@...]
> Sent: Friday, August 01, 2003 12:01 PM
> To: oldsynths@yahoogroups.com
> Subject: Re: [oldsynths] Digest Number 60
>
> > Message: 2
> > Date: Thu, 31 Jul 2003 10:23:30 -0700
> > From: Rory McDonald <rmcdonald@...>
> > Subject: RE: MG-1 input filter mod
> >
> > Well an electrolytic would be polarity sensitive...
> >
> > -----Original Message-----
> > From: Shayne Cafferata [mailto:scafferata@...]
> > Sent: Thursday, July 31, 2003 9:54 AM
> > To: oldsynths@yahoogroups.com
> > Subject: [oldsynths] MG-1 input filter mod
> >
> > i'm wondering, for those familiar with the input filter mod on the
> realistic
> > mg-1, does it make a difference what type
> > of capacitor is used? a .47mf has been recommended over the originally
> > suggested .1mf , but does it matter if it's an
> > electrolytic or ceramic?
> > i have both.
> >
> > thanks,
> > shayne
>
> the instructions i have are pretty straightforward. basically, you come off
> the negative pole of a capacitor on the board to the positive center of an
> input jack, with a .47 mf cap inline. the type of cap was not specified and
> i am too much a novice to know if it matters, but cautious enough to ask
> before plugging in the soldering iron. the electrolytic, being polarity
> sensitive, does this mean the flow of electrons is directional? as in,
> flowing only one way? i'm thinking that the type of cap probably doesn't
> matter, except if i use the electrolytic it would need to be properly
> oriented(which would be - coming from the input - negative to positive?). i
> know i'm in the presence of masters here, so please bear with these, uh,
> questions from the back row, so to speak...