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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: ccage on May 04, 2017, 09:57:00 PM
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Doug Oade fixed me up w/ a 12v external to test on my old 248.
Will test it out soon and report back
(http://i75.photobucket.com/albums/i306/ccge/248_zpsplv86et1.jpeg)
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I am very interested to see how this works out. Does the 12v by-pass the internal batteries?
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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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i need this for the 148, but well, i think people have tried this before
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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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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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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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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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Doug is looking at external option for my 148 I sent him.
Will keep folks posted.
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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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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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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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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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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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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
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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.