Ah, didn\ufffdt look to much on the schematic. You mean if you remove the resistor that the diode will block the charging voltage ? Possibly. I don\ufffdt know what type of diode it is. Remove the resistor and measure the voltage before and after the diode. There should be no voltage after the diode. WT ----- Original Message ----- From: "jesper" <jesper@...> To: <Simmons_Drums@yahoogroups.com> Sent: Thursday, December 29, 2011 1:40 PM Subject: Re: [Simmons Drums] MTM and change of battery But, what's it for then? I thought the original charge came over the resistor. /j. WT skrev 2011-12-29 09:55: > That diode doesn\ufffdt 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 >> >> >> ------------------------------------ >> >> Yahoo! Groups Links >> >> >> > > > > ------------------------------------ > > Yahoo! Groups Links > > > > -- electronically yours, jesper - -- --- ---- ----- ---- --- -- - www.electronic-obsession.se ------------------------------------ Yahoo! Groups Links
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Re: [Simmons Drums] MTM and change of battery
2011-12-29 by WT