Vintage Simmons Drums (UK) Users Group

I would just put a diode in series with the + side of the Lithium-cell.

How you do it depends on where you put the Lithium-cell.

WT

----- Original Message ----- 
From: "jesper" <jesper@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Wednesday, December 28, 2011 10:57 AM
Subject: [Simmons Drums] MTM and change of battery


> Hi list,
> 
> I thought I should change the battery of my latest MTM today. But since 
> I was stupid enough not to make notes or take pictures when last time 
> doing this I dug out one of the other units to have a look.
> 
> No. 114 had it's battery changed by the former owner and as far as I 
> remember I copied the work in my other MTM. Apart from the removal of 
> the old battery and the insertion of a AA-sized Lithium dito I can only 
> see one change: the lifting/removal of resistor 37. I did the same on my 
> other MTM and both works well, both functions and memory.
> 
> Here's a shot of what can be seen inside no. 114.
> http://www.electronic-obsession.se/studio/simmons/mtm_battery_mod.jpg
> 
> So techs, let me know if this is wrong. Should I lift diode 30 too? 
> Anything else? The schematics aren't the best and I'm no master at 
> reading it anyway. :)
> 
> Happy holidays,
> -- 
> electronically yours, jesper
> 
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