Vintage Synth Repair

> 
> In addition, a (yellow) Panasonic 3V memory backup battery for the
> Drumulator is needed. I have only a pic and all I can read is:
> 3V R-2/3A
> 
> Any idea where these are available ?
> 
> thx in advance
> 
> PeWe
>

>
> In addition, a (yellow) Panasonic 3V memory backup battery for the
> Drumulator is needed. I have only a pic and all I can read is:
> 3V R-2/3A
>
> Any idea where these are available ?
>
> thx in advance
>
> PeWe

----- Original Message -----
From: "PeWe" <ha-pewe@...>
To: <vintagesynthrepair@yahoogroups.com>
Sent: Wednesday, April 25, 2007 9:39 AM
Subject: Re: [vintagesynthrepair] Re: Syco Systems Sycologic M16 midi
matriss and EMU Drumulator


> Hi Narfman !
>
> Many thanx for the links !
> Isn\ufffdt it, the mAh should match properly or should eventually never be
lower
> compared to the original ?
> Does a higher mAh possibly damage something ?
> Is higher mAh better, - only loading faster ?
>
> Sorry for stupid question, - but I myself, more keyboardist than tech,
don\ufffdt
> know exactly and want to be sure ...
>
> all the best, - PeWe
>
> ----- Original Message -----
> From: narfman96
> To: vintagesynthrepair@yahoogroups.com
> Sent: Wednesday, April 25, 2007 1:40 AM
> Subject: [vintagesynthrepair] Re: Syco Systems Sycologic M16 midi matriss
> and EMU Drumulator
>
>
> Hi PeWe,
>
> I found these 80 mah 3.6 volt Ni-Mh 3 pin Varta batteries at Mouser:
>
> http://www.mouser.com/catalog/629/1720.pdf
>
> This will at least give the specs so you can search around for some
> 100 or 150 mah cells. Try not to use the NiCad's as they seem to leak
> more. Make sure the runs on the board are not discolored.
>
> Panasonic Lithium 2/3 A 3V battery with tags - part number BR-2/3AT-
> 2SP is the exact replacement for the Drumulator. The Digikey link is:
>
> http://dkc3.digikey.com/PDF/T061/1589.pdf
>
> This should help. Now if only I could find a set of schematics or a
> service doc on the Korg Poly-800 Mark 2???
>
> Narfman
>
> --- In vintagesynthrepair@yahoogroups.com, "pe4free" <ha-pewe@...>
> wrote:
> >
> > Hello!
> >
> > I\ufffdm looking for Varta mempac100, 3V6, 100mAh rechargable memory
> backup
> > batterys,- can\ufffdt find any up to now but would need 2 or 3.
> > The originals are NI-CAD types, but NiMH replacemants would be
> welcome.
> >
> > In addition, a (yellow) Panasonic 3V memory backup battery for the
> > Drumulator is needed. I have only a pic and all I can read is:
> > 3V R-2/3A
> >
> > Any idea where these are available ?
> >
> > thx in advance
> >
> > PeWe
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date: 24/04/07
17:43
>
>

----- Original Message ----- 
From: John Brewer
To: vintagesynthrepair@yahoogroups.com
Sent: Wednesday, April 25, 2007 1:01 PM
Subject: Re: [vintagesynthrepair] Re: Syco Systems Sycologic M16 midi 
matriss and EMU Drumulator


>If only they would write on the box what these terms mean!!
>Anyway it is not a stupid question.

hurray !!! :-)

>mAH just means 'milliamps for an hour.'

Yep, - this is what I know.

>So if a battery was rated at 10
>mAh you could draw 10 mA for an hour before the terminal voltage dropped
>below a usable level. The same battery will supply 1 mA for 10 hours or 0.5
>mAmps for 20 hours. Does that help?

thx, - this is helpful info.

What I didn\ufffdt know is/was, - if I can "draw" an xy-mA for an hour, what does 
the spec mean regarding the "loading" of the rechargable battery ?
In other words :
The Syco has a circuit which re-loads the battery during AC powered common 
use.
Possibly the 100mAh spec could be related to the recovering time of the 
battery also, resulting in, I eventually should have the machine connected 
to the mains for a longer period of time after replacing the rechargable 
battery and before I start to work w/ it and switching it "off" after a 
short(er) time, - losing all of the reprogrammed data again and being 
surprised then.

If I understand right, it is,...( if I don\ufffdt find the exact replacement for 
the old Varta mempac 100 ) ...

I could use a 80mAh type as a replacement if the 3.6V spec matches, 
resulting in a shorter "draw" time (compared to 100mAh) from the battery 
only, - if it\ufffds been switched "off" and in stock p.ex., - isn\ufffdt it ?

I could also use a 150mAh / 3.6V type as a replacement, resulting in much 
longer "draw" time, - which seems to be an advantage.

The replacement cannot be overloaded by the circuit if it matches 3.6V 
regardless which spec the mAh is.

The only and minor prob might be the tags of the replacement \ufffdcause these 
eventually won\ufffdt fit the circuitboards points exactly.

I hope that\ufffds right and then I would be fine.

thx for reply again...

>John.

PeWe