Vintage Synth Repair

Hi John !
>>>

----- 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