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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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Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras
« on: 22 / August / 2009, 06:59:08 »
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UPDATE:- I have started to document this project on my website.
First post is here.
http://www.mishra.tv/wordpress/?p=40



Can anyone confirm what exactly is the DC socket size on the Canon powershot models ? Is it 1.1mm or 1.3mm ? I want to build an external battery pack but cannot locate the DC size - I am using Canon Powershot A450 and A460.
« Last Edit: 01 / November / 2009, 10:49:52 by zcream »
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #1 on: 22 / August / 2009, 07:28:59 »
Quote from: zcream on 22 / August / 2009, 06:59:08
Can anyone confirm what exactly is the DC socket size on the Canon powershot models ?  I want to I am using Canon Powershot A450 and A460.

On the A460 it is a 0.7/2.5mm, centre is positive :

http://www.maplin.co.uk/Module.aspx?moduleno=43084

David
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #2 on: 22 / August / 2009, 07:52:17 »
Hi David. I can confirm that the A460 dc input socket is too small for a 2.5mm jack. Just tested it. Looks smaller than 2.1mm even..
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #3 on: 22 / August / 2009, 08:09:12 »
Here is a discussion thats interesting as they talk about the same stuff..

http://www.electronics-related.com/usenet/basics/show/53066-1.php
>>
>it is a 2.35 x 0.7 mm connector, which would probably be an
>EIAJ-01, formerly sold by Radio Shack as 274-1531, but
>apparently no longer. Rats.
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Offline fudgey

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #4 on: 22 / August / 2009, 08:18:28 »
I've been using 2.35 mm / 0.7 mm plugs (Marushin MP-201L, supposedly somewhat standard 3.15 V plug to EIAJ RC-5320) with my a570is. Even though they work flawlessly, I think they are a bit bit loose (this was the closest thing I could find with ease), so I wouldn't be surprised if Microfunguy's 2.5 mm was a better choice for me.
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #5 on: 22 / August / 2009, 08:27:14 »
Quote from: zcream on 22 / August / 2009, 07:52:17
Hi David. I can confirm that the A460 dc input socket is too small for a 2.5mm jack. Just tested it. Looks smaller than 2.1mm even..

I can guarantee the 'advertised' 0.7/2.5mm is the correct size, I have just measured it on the external battery pack that I have made.

However, the actual outside diameter I measured was 2.44 mm.


David
« Last Edit: 22 / August / 2009, 08:32:59 by Microfunguy »
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #6 on: 22 / August / 2009, 08:56:02 »
OK. I'll take the camera and try out both. Did you use 3x AA batteries for the external pack ? Rating is 3.15V for the DC socket. Or a LiON battery ?
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #7 on: 22 / August / 2009, 09:00:20 »
I should not have said battery pack, that was  used with my A620.

With the A460 I am using a 'Fameart' model ADP125SM universal AC/DC adapter set 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 #8 on: 22 / August / 2009, 09:02:04 »
With the A620, what did you end up using ? I have to power 50 of these..So its 60 batteries for a battery pack and I am depending on the fact that all will not fire at the same time - so the current draw will be much less than 100A :-)
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Offline fudgey

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #9 on: 22 / August / 2009, 09:24:53 »
The external supply voltage range (at least on these dual AA cameras) is same as the battery voltage range. So, if you momentarily go below 2,0 VDC after all connector and cable losses (which are rather significant) the camera will shut down, and 3.3 V peak can't be destructive.

Note that the camera's internal batteries are disconnected when running on external power, so the quality of external power really is essential. Unless your 50 cameras are all close to each other (not more than a few meters from the pack), a single 3 V battery pack may not perform adequately, and the lower the voltage, the higher the risk of undervoltage shutdown.

I'm using regulated 3,0 VDC / 3 A switching PSU's (I have one powered from mains and one from 12 VDC...they are both actually for my NiMH charger).
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