Discussion about the Korg PolySix synthesizer

My polysix needs a new battery... the Old Crow site describes  a 
possible replacement with a 3v lithium disc cell..... can you use a 3.6 
lithium  solder-in  1/2 aa cell ? and if so , must you do the  
capacitor and resistor  to diode  transplant? The reasoning for this 
mod is not explained in that site and i cant find a tech who can 
explain it to me... why cant you just switch the battery? is there a 
diffrence with a lithium vs. nicad?  (i have the reccomended  diode, 
but wonder why you must do it?)

Well, the reason for the replacement is so that when you replace the
battery with a non-chargeable kind, like the lithium style, the
circuit doesn't charge it, causing it to explode.

The original battery is Ni-Cad and someone had the idea that it should
be charged rather than using a replaceable battery.

As for 3.6, I don't know if .6 volts is that big a difference but I
would play it safe. You could probably tell by looking at the
datasheet for whatever part is being charged by the battery.

Hope that helps!

--- In PolySix@yahoogroups.com, "spistrich" <wasteking@...> wrote:

>
> My polysix needs a new battery... the Old Crow site describes  a 
> possible replacement with a 3v lithium disc cell..... can you use a 3.6 
> lithium  solder-in  1/2 aa cell ? and if so , must you do the  
> capacitor and resistor  to diode  transplant? The reasoning for this 
> mod is not explained in that site and i cant find a tech who can 
> explain it to me... why cant you just switch the battery? is there a 
> diffrence with a lithium vs. nicad?  (i have the reccomended  diode, 
> but wonder why you must do it?)
>

That's exactly it.  The circuit is designed to charge the NiCad
battery whenever the synth is turned on.  That way, the battery will
have a full charge when the synth is turned off.  At the time, Li-Ion
batteries weren't around, so there was no good way to have a battery
that would last a long long time without recharging.

Guess what happens when you use a (non-rechargeable) Li-Ion battery in
a charging circuit?  It blows up.

I'm really surprised that you can't find a tech that could explain
that to you.  It's really quite simple.

The resistor is part of the charging circuit.  The diode will be
installed so that it disables the charging circuit, letting power
LEAVE the battery, but not ENTER the battery.

On 5/10/07, spistrich <wasteking@verizon.net> wrote:
> My polysix needs a new battery... the Old Crow site describes  a
> possible replacement with a 3v lithium disc cell..... can you use a 3.6
> lithium  solder-in  1/2 aa cell ? and if so , must you do the
> capacitor and resistor  to diode  transplant? The reasoning for this
> mod is not explained in that site and i cant find a tech who can
> explain it to me... why cant you just switch the battery? is there a
> diffrence with a lithium vs. nicad?  (i have the reccomended  diode,
> but wonder why you must do it?)
>
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>


-- 
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-Chromatest J. Pantsmaker
http://www.chromatest.net