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Old 06-29-2010, 04:34 AM #17
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Default Re: questions about micro boost drive

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Originally Posted by daguin View Post
Just trying to break something loose (mentally). I don't see the problem.

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me either.. thats why its so confusing..

i sent drlava a pm so i guess ill just have to wait on his reply..


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Old 06-29-2010, 04:38 AM #18
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Default Re: questions about micro boost drive

Anything bridged on the back?

Is the dummy load OK?

Peace,
dave
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Old 06-29-2010, 04:44 AM #19
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Default Re: questions about micro boost drive

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Originally Posted by Pontiacg5 View Post
I've just been wiring the case pin to the driver input, works like a charm
this is a no no with the microboost. wire the neg of the diode isntead of the case pin.
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Old 06-29-2010, 04:46 AM #20
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Default Re: questions about micro boost drive

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Originally Posted by daguin View Post
Anything bridged on the back?

Is the dummy load OK?

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First sorry for not multi quoting but , my dummy load went bad while setting 2 microboosts today, the load actually smoked when i set the microboost to its lowest POT setting with all 3 bridges crossed.
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Old 06-29-2010, 04:48 AM #21
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Default Re: questions about micro boost drive

What? I'm pretty sure what you just suggested is not recommended with a microboost.

On a case neutral diode like a blue or blu you can wire the case pin to the input of the driver. Then wire the diode anode and cathode directly to the output of the driver.

Edit: Typed diode instead of driver :P

Last edited by Pontiacg5; 06-29-2010 at 05:02 AM.
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Old 06-29-2010, 04:56 AM #22
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Default Re: questions about micro boost drive

Quote:
Originally Posted by Morgan View Post
I may be misunderstanding but doesn't the manual say you cannot use the case as a ground with a MicroBoost? This may not be your problem but something to bare in mind.

M
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Originally Posted by SpyderFire View Post
this is a no no with the microboost. wire the neg of the diode isntead of the case pin.
Quote:
Originally Posted by Pontiacg5 View Post
What? I'm pretty sure what you just suggested is not recommended with a microboost.

On a case neutral diode like a blue or blu you can wire the case pin to the input of the driver. Then wire the diode anode and cathode directly to the output of the diode.
I'm talking about using the diode case pin with a separate isolated wire going to the driver negative input...

And of course the driver negative output must go to the diode negative pin...
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Last edited by jayrob; 06-29-2010 at 05:32 AM.
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Old 06-29-2010, 05:04 AM #23
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Default Re: questions about micro boost drive

Well Using the diode case pin and the neg on the diode together connected to the neg on the driver (microboost) has resulted in the microboost , boosting wayyy past what the diode can take and killing it. (12x BR) Because the driver doe not get a voltage feedback and tries to boost until its maxed out.

Using only the neg and the pos, of the diode directly to the drivers diode+ and - , has worked.

im speaking only from experience and not just talking of what could happen.
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Old 06-29-2010, 05:08 AM #24
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Default Re: questions about micro boost drive

no no no, you only connect the case pin to the input of the driver, then connect the negative output of the driver to the diode. The die of the diode is neutral, so the case pin does not effect it.

I would draw a pic, but I am tired. Believe Jay and I, it does work!
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Old 06-29-2010, 05:31 AM #25
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Default Re: questions about micro boost drive

Quote:
Originally Posted by SpyderFire View Post
Well Using the diode case pin and the neg on the diode together connected to the neg on the driver (microboost) has resulted in the microboost , boosting wayyy past what the diode can take and killing it. (12x BR) Because the driver doe not get a voltage feedback and tries to boost until its maxed out.

Using only the neg and the pos, of the diode directly to the drivers diode+ and - , has worked.

im speaking only from experience and not just talking of what could happen.
Yeah your not reading what I wrote... I'll edit and highlight some key words...
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Last edited by jayrob; 06-29-2010 at 05:34 AM.
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Old 06-29-2010, 05:57 AM #26
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Default Re: questions about micro boost drive

This seems to be causing some confusion, (maybe I'm adding to it ). It does warn in the manual about NOT using the case as a ground though doesn't it?

I'm going for some sleep but expect you all to have worked through this before I awake! I thank you...

M
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Old 06-29-2010, 06:25 AM #27
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Default Re: questions about micro boost drive

Quote:
Originally Posted by ndrew2505 View Post
3v, 5v, and 3.7v

3v and 5v rail from modified cpu psu and 16340 and 18650 batts
Quote:
Originally Posted by daguin View Post
Just trying to break something loose (mentally). I don't see the problem.


Peace,
dave
Sorry for the double post here, (and not going to bed already), but I do see a problem here. This is a boost only driver. In previous posts in another thread Dr.Lava has said a maximum of 4.4V is acceptable to run one of these diodes from a MicroBoost, (Jay, do you remember the thread?). What's the maximum current draw available from the PSU and other sources?

I still hope there is another solution but I wouldn't try the 5V setting again until there is clarification. Just a thought.

M
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Last edited by Morgan; 06-29-2010 at 06:28 AM.
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Old 06-29-2010, 07:22 AM #28
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Default Re: questions about micro boost drive

I was just working on a Phaser 'Hot' option and found that the Micro Boost did not hold steady (along with the sound board) over 600mA's using 2 X e2 lithium AA batteries.... (in series)

But a single 14500 Li-Ion battery made it very stable. So I will be re-wiring this one to use 2 X 14500's in parallel...

Kind of scratching my head because I could have sworn that I have used a Micro Boost before with 2 X e2 AA's...
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Last edited by jayrob; 07-01-2010 at 04:43 AM.
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Old 06-29-2010, 12:27 PM #29
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Default Re: questions about micro boost drive

there is nothing bridged and the 5v rail isnt causing the problem. the driver was heating up before i ever used the 5v rail... maybe the dummy load did go bad.. ill have to try another one later tonight after work.
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Old 06-29-2010, 03:41 PM #30
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Default Re: questions about micro boost drive

Quote:
Originally Posted by jayrob View Post
Yeah your not reading what I wrote... I'll edit and highlight some key words...
You're right I was thinking current not voltage. I have to read and write when im not so sleepy. my apologies
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Old 06-29-2010, 03:52 PM #31
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Default Re: questions about micro boost drive

i had a similar problem with my v5... i was using a modified atx psu. at the 3v and 5v. setting. it would not work. so i hooked the driver and testload set up directly to my batteries. then low and behold i got readings and set my v5 to 810ma. also i took a razor blade and cleaned up all the areas around all my solder connections. it might look clean but it is such a small area i didn't want to risk it.

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Old 06-29-2010, 07:07 PM #32
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Join Date: Sep 2007
Location: Northern CA, U.S. Astrophotography! (Some of my Photos)
Posts: 9,851
Rep Power: 3922
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Default Re: questions about micro boost drive

Update...

I just tried a Micro BoostDrive with 3 X AAA e2 lithium at 600mA's and the batteries will not hold current.

Strange...

I would think that at 4.5 volts, the lithium AAA's would handle the current.

But it must have to do with current demand and not voltage demand...

Because I then tested with a single Li-Ion battery, and it worked perfectly...

Even a tiny 10280 runs it stable at 600mA's with the test load!

My conclusion is that Li-Ions can give a ton more current than lithium primaries...

I'm thinking that the 3 X AAA in series, although it multiplies voltage to 4.5, does not do anything for capacity at 4.5 volts. So it's just asking for too much current from a AAA battery is what the problem must be...

But this still seems strange, because I believe the FlexDrives can get that kind of current with 2 X AAA in a pen for instance...
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Last edited by jayrob; 07-01-2010 at 04:43 AM.
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