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Author Topic: M 248 w external battery  (Read 1513 times)

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Offline ccage

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M 248 w external battery
« on: May 04, 2017, 09:57:00 PM »
Doug Oade fixed me up w/ a 12v external to test on my old 248.
Will test it out soon and report back

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Offline Colin Liston

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Re: M 248 w external battery
« Reply #1 on: May 06, 2017, 10:31:49 AM »
I am very interested to see how this works out.  Does the 12v by-pass the internal batteries?
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Offline ccage

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Re: M 248 w external battery
« Reply #2 on: May 07, 2017, 07:53:56 PM »
I am very interested to see how this works out.  Does the 12v by-pass the internal batteries?

Here's response from Doug on Battery set up:

Hi Chris, no worries, I'm not in any hurry. Yes, the way it is wired, it's either
the internal battery or the external battery. If they both worked together then
there would have to be a circuit that protects the batteries from each other. That
uses power and reduces runtime. If you have a weak internal then plug in an external
with no circuit protection, it will blow a fuse or, over time, cause both batteries
to swell and fail.
 
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Offline tubems

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Re: M 248 w external battery
« Reply #3 on: May 16, 2017, 08:06:49 PM »
i need this for the 148, but well, i think people have tried this before
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Offline fsulloway

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Re: M 248 w external battery
« Reply #4 on: May 17, 2017, 02:43:45 PM »
That would be nice but I don't there is a solution for it right now. At least I don't think Doug is interested in working on one. Chris may chime in on that perhaps.
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Offline ccage

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Re: M 248 w external battery
« Reply #5 on: May 23, 2017, 06:54:35 PM »
took the combo out for a spin for NMA last Saturday...ran the ext battery for 3 1/2 hrs and it showed 75% charge left.
Ran the mk4's w/ gain knobs on pre at about 60%...sounds great as usual.
Will see if the drain rate increases more or holds steady with what's left on external. 
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Online goodcooker

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Re: M 248 w external battery
« Reply #6 on: May 24, 2017, 02:13:05 PM »
i need this for the 148, but well, i think people have tried this before

The 148 has 48 volts of internal batteries and no DC - DC converter. You would need to hook it up to a 48 volt external battery.
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Offline Colin Liston

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Re: M 248 w external battery
« Reply #7 on: May 24, 2017, 08:42:28 PM »
i need this for the 148, but well, i think people have tried this before

The 148 has 48 volts of internal batteries and no DC - DC converter. You would need to hook it up to a 48 volt external battery.

I'm convinced Doug built the 148 around a 48 volt power supply he had lying around
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Offline ccage

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Re: M 248 w external battery
« Reply #8 on: June 08, 2017, 01:40:14 PM »
Doug is looking at external option for my 148 I sent him.
Will keep folks posted.
Schoeps  MK4, Microtech Gefell 210, NBob Actives, JB Mod PFA Nak 300>cp103, JB Mod PFA Nak cp104   
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Offline tubems

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Re: M 248 w external battery
« Reply #9 on: June 08, 2017, 03:03:21 PM »
Doug is looking at external option for my 148 I sent him.
Will keep folks posted.

cool.  my internals are dead on mine and ill wait on this till i replace them.
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Offline Colin Liston

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Re: M 248 w external battery
« Reply #10 on: June 08, 2017, 06:17:54 PM »
Doug is looking at external option for my 148 I sent him.
Will keep folks posted.

Hell yes.  I can't wait to see what he comes up with.  An external option or a locking on/off switch.
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Offline ccage

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Re: M 248 w external battery
« Reply #11 on: July 19, 2017, 06:57:47 PM »
Doug said he sourced a ultra quiet 12v to 48v DC converter for my 148 that will let me use same 12v external I'm using for the 248.
Good bye SLA's hopefully for the brick.
Will keep posted
 
Schoeps  MK4, Microtech Gefell 210, NBob Actives, JB Mod PFA Nak 300>cp103, JB Mod PFA Nak cp104   
Oade m248 Pre x2, Oade m148 Pre, Audioroot Femto Pre
SD 744
Darktrain cables-tgakidis cables/bar
followinbob clips/risers/bars

Offline tubems

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Re: M 248 w external battery
« Reply #12 on: July 20, 2017, 11:32:57 AM »
Doug said he sourced a ultra quiet 12v to 48v DC converter for my 148 that will let me use same 12v external I'm using for the 248.
Good bye SLA's hopefully for the brick.
Will keep posted

Alright!  This is great news!!   Well keep us up, my 148 is waiting
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Offline jbell

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Re: M 248 w external battery
« Reply #13 on: July 20, 2017, 01:03:52 PM »
So it could then be moved into a smaller case??

Doug said he sourced a ultra quiet 12v to 48v DC converter for my 148 that will let me use same 12v external I'm using for the 248.
Good bye SLA's hopefully for the brick.
Will keep posted
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Offline ccage

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Re: M 248 w external battery
« Reply #14 on: July 21, 2017, 01:12:15 AM »
So it could then be moved into a smaller case??

Doug said he sourced a ultra quiet 12v to 48v DC converter for my 148 that will let me use same 12v external I'm using for the 248.
Good bye SLA's hopefully for the brick.
Will keep posted

not sure..the converter is going in space vacated by slas he's removing
Schoeps  MK4, Microtech Gefell 210, NBob Actives, JB Mod PFA Nak 300>cp103, JB Mod PFA Nak cp104   
Oade m248 Pre x2, Oade m148 Pre, Audioroot Femto Pre
SD 744
Darktrain cables-tgakidis cables/bar
followinbob clips/risers/bars

 

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