Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras - page 2 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras

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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #10 on: 22 / August / 2009, 09:47:49 »
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I am using 2100mah LSD batteries - an Eneloop clone. So the variance in power should be less. All the connectors will be soldered.
The 3.6V will hopefully give enough of a leeway.
The cameras will fire 40ms after each other. So hopefully the peak current draw will not be more than 20A as the camera draws max power when saving the image to flash.
Otherwise the Review is off, AF and related functions are off, flash is also off. Lets see how it goes..

On another note do you know the technical part num for the 0.7 * 2.5mm plug ? The Maple numbering seem to be specific to their site..
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #11 on: 22 / August / 2009, 09:52:46 »
Quote from: zcream on 22 / August / 2009, 09:02:04
With the A620, what did you end up using ?

See image below, there may be more suitable batteries.

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current draw will be much less than 100A :-)

Use multiple sealed lead-acid 6V batteries with their outputs connected by power diodes so that individual batteries can be removed for charging.

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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #12 on: 22 / August / 2009, 09:57:56 »
How would you reduce 6V to 3V ? I assume the diode is for voltage reduction - would there not be a substantial power drop across the diode if I drop the 6V to 3V ?
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #13 on: 22 / August / 2009, 09:58:22 »
I found the plug BTW.. The other distributor in Sydney had it.
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #14 on: 22 / August / 2009, 10:08:44 »
As a side - wikipedia does not even seem to acknowledge this size - http://en.wikipedia.org/wiki/Coaxial_power_connector
They have 0.7mm / 2.35mm and 0.7mm/2.4mm
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #15 on: 22 / August / 2009, 10:13:19 »
Quote from: zcream on 22 / August / 2009, 09:57:56
How would you reduce 6V to 3V ?
I thought you meant the 50 camera application was with A620's.

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I assume the diode is for voltage reduction
No, it was to allow multiple batteries to be connected in parallel.

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would there not be a substantial power drop across the diode if I drop the 6V to 3V ?

100A at 3V is not going to be easy.
very high efficiency step-down regulators would be expensive and you would need a lot of them.

How long does this rig have to run for ?

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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #16 on: 22 / August / 2009, 10:15:25 »
Quote from: zcream on 22 / August / 2009, 09:58:22
I found the plug BTW.. The other distributor in Sydney had it.
Quote from: zcream on 22 / August / 2009, 09:58:22
I found the plug BTW.. The other distributor in Sydney had it.

Remember, I have not tried inserting a 2.5mm diameter object into the socket, just 2.44 mm diameter.
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #17 on: 22 / August / 2009, 10:21:21 »
Sorry. I am using A450 and A460s.
Quote from: Microfunguy on 22 / August / 2009, 10:13:19

I thought you meant the 50 camera application was with A620's.

I dont really need 100A. The cameras will not fire at the same time, each camera is offset 40ma from the next. For 50 cameras, that means the last camera will fire 2 seconds after the first.
I assumed is takes 100ma for maximum power draw of 2A. So the maximum power draw should not be more than 6A + whatever the cameras draw in idle mode. They will be triggered via a USB remote.
Quote from: Microfunguy on 22 / August / 2009, 10:13:19
100A at 3V is not going to be easy.
very high efficiency step-down regulators would be expensive and you would need a lot of them.

How long does this rig have to run for ?


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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #18 on: 22 / August / 2009, 10:22:15 »
They only take 1 pic at a time. Then I can stop to recharge the battery if I like. Max shots would 10-20 per day.
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #19 on: 22 / August / 2009, 12:44:54 »
Also, a reply from Canon about the specs, 
>>>
Dear XXX:

Thank you for writing to us.  We value you as a Canon customer and
appreciate the opportunity to assist you with our PowerShot cameras.

We are sorry to inform you that Canon has not released any
specifications regarding the size of the cameras DC jacks.  We regret
any inconvenience.

Please let us know if we can be of any further assistance with our
cameras.

Thank you for choosing Canon.

Sincerely,

Christopher
Technical Support Representative
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