Vintage Simmons Drums (UK) Users Group

Paul White at Electrongate supplies magnetic RAM storage for Oberheim DMX's and similar, which eliminates the battery totally. I'm surprised this technology hasn't been adopted/adapted for other vintage gear...(although I'm not a tech so there may be some reason it wouldn't work).  Info here:  http://www.electrongate.com/dmxfiles/mram.html

--- In Simmons_Drums@yahoogroups.com, jesper <jesper@...> wrote:
>
> vout@... skrev 2012-03-18 16:34:
> > Hi,
> >
> > Okay, now I'm confused and this is why I asked here seeking informed
> > opinion. I did some searching before asking this question and there
> > seems to be a lot of contradictory advice out there about suitable
> > replacements for ni-cads.
> >
> > The big problem for me is battery leakage, so from that standpoint NiMH
> > is not a good option as it seems they can leak just as badly. The
> > consensus seems to be that Lithium batteries are the least likely to
> > leak, though they can in very rare and extreme conditions.
> >
> > Lets be clear that I am talking about using a non-rechargeable and
> > fairly high capacity Lithium battery (AA size probably) and removing or
> > blocking the existing charging current in the way described by Jesper.
> > It works for him and I think it will be a good solution for me too. Also
> > I have seen people using Lithium CR2032 button cells to provide memory
> > back-up in TR-606's and TB-303's so it does seem to be a workable solution.
> >
> > Cheers, vout
> 
> That was my train of thoughts too. One of my MTM's was quite messy and 
> the SDS-7 not a pretty sight either. I took some scary shots when 
> changing that one. Will make a "how to-page" one of these weeks/months. 
> My main concern wasn't loosing memories. It was leakage in the future. 
> 10 years passes so quickly... 20 too by the way. Also, I decided to go 
> with AA-battery size and mount it far from the PCB. I've done the same 
> in other gear and have another battery + holder here on my workbench 
> that's intended for my OSCar soon, very soon.
> I'm against "drop-ins" due to their place on the PCB. I'm against NiMh 
> due to the fact that they leak more easily. I prefer AA in a holder 
> since it's easy to replace. I want to be able to do that while the unit 
> is powered and don't mess with memory backup on external media.
> 
> These are just my opinions. Gordon has his and if it works for him, all 
> the better! We all use our gear in different ways. We are differently 
> skilled in soldering and messing about inside. Some gear are annoying to 
> program (SDS-7) and some a lot easier (MTM).
> 
> Keep banging those hexaheads!
> 
> -- 
> electronically yours, jesper
> 
> - -- --- ---- ----- ---- --- -- -
> www.electronic-obsession.se
>