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Author Topic: M 248 w external battery  (Read 2275 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.
 
Schoeps  MK4, MK41, NBob Actives,Naiant PFAs, JB Mod PFA Nak 300>cp103, JB Mod PFA Nak cp104  
Oade m248 Pre x2, Oade m148 Pre, Audioroot Femto Pre
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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. 
Schoeps  MK4, MK41, NBob Actives,Naiant PFAs, JB Mod PFA Nak 300>cp103, JB Mod PFA Nak cp104  
Oade m248 Pre x2, Oade m148 Pre, Audioroot Femto Pre
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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, MK41, NBob Actives,Naiant PFAs, 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-Naiant PFA's-Nbob Actives

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, MK41, NBob Actives,Naiant PFAs, 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-Naiant PFA's-Nbob Actives

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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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, MK41, NBob Actives,Naiant PFAs, 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-Naiant PFA's-Nbob Actives

Offline ccage

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Re: M 248 w external battery
« Reply #15 on: September 23, 2017, 12:34:05 AM »
Doug has upgraded my 248 further w/ better DC converter and EQ chip in addition to the external 12v supply.
Guess we can call it the M248 mkII!
Will take it out for test drive next weekend at DBT shows in ATL - Doug said some of you have reached out about this project and the 148 project so
hopefully will have positive results.
Internal/External battery combo should get me about 10-11 hrs.   

Here's email from Doug:
Chris, I decided to replace the +/- 12 volt converter
 and the EQ chip. They are the only parts common to both
 channels. I saw the converter drop to +/- 10.5 volts, not
 enough to cause output to drop but enough to tell me
 it's on its way out. I used a new chip that I like a lot
 for the EQ circuit. It has the ability to generate a more
 impressive 3D soundstage. I'm going to leave the M248 on
 for a while but I feel good about it now.
 I'll let you know and thanks for your patience....Doug
 
 
 BTW, I'm now working on making the M148 power
 system more efficient.
Schoeps  MK4, MK41, NBob Actives,Naiant PFAs, 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-Naiant PFA's-Nbob Actives

 

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