That diode doesn´t block the charging voltage. If it did, how would the
original battery get charged ?
WT
----- Original Message -----
From: "jesper" <jesper@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Thursday, December 29, 2011 5:17 AM
Subject: Re: [Simmons Drums] MTM and change of battery
> OK, me again, with insomnia, hence the somewhat slow brain...
>
> I checked the schematics and noted that the two components on the + side
> of the battery is in fact "just" the mentioned resistor (37) and the
> diode (30) already in place.
>
> http://www.electronic-obsession.se/studio/simmons/mtm_battery_circuit.jpg
>
> So I cannot see any need for another diode. Please correct me if I'm
> misinterpreting anything.
>
> /j.
>
>
> jesper skrev 2011-12-29 05:00:
>> Hi WT,
>>
>> so, basically just between the PCB solder point and the red wire in my
>> photo? To block any voltage from reaching the battery? Any critical
>> value or would any decent diode do?
>>
>> thanks,
>> /j.
>>
>>
>> WT skrev 2011-12-29 00:50:
>>> 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@...
>>> <mailto:jesper%40electronic-obsession.se>>
>>> To:<Simmons_Drums@yahoogroups.com<mailto:Simmons_Drums%40yahoogroups.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
>>> >
>>> > - -- --- ---- ----- ---- --- -- -
>>> > www.electronic-obsession.se
>>> >
>>> >
>>> > ------------------------------------
>>> >
>>> > Yahoo! Groups Links
>>> >
>>> >
>>> >
>>>
>>>
>>
>>
>
>
> --
> electronically yours, jesper
>
> - -- --- ---- ----- ---- --- -- -
> www.electronic-obsession.se
>
>
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>
> Yahoo! Groups Links
>
>
>