Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras - page 6 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum supplierdeeply
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Setup for CHDK matrix bullet-time rig with Powershot A450 and A460 cameras

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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #50 on: 01 / September / 2009, 05:11:06 »
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So, have you tried the test I detailed above ?

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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #51 on: 03 / September / 2009, 23:08:23 »
Hi Microfunguy. I am doing the tests this weekend. Been busy fixing my car. Just to confirm, its center positive and outer negative isn't it ?
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #52 on: 04 / September / 2009, 07:26:18 »
Quote from: zcream on 03 / September / 2009, 23:08:23
Been busy fixing my car.
I have been even busier replacing a collapsed ceiling  :)

Quote
Just to confirm, its center positive and outer negative isn't it ?


Yes.

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Offline cybercom

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #53 on: 05 / September / 2009, 21:31:35 »
Quote from: Microfunguy on 04 / September / 2009, 07:26:18

I have been even busier replacing a collapsed ceiling  :)



I hope this wan't a result of your recent roofing job... :o
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #54 on: 06 / September / 2009, 05:22:42 »
Quote from: cybercom on 05 / September / 2009, 21:31:35
I hope this wan't a result of your recent roofing job... :o


Yes it was

I guess it is more difficult to keep-out rain than I realised, it only needs the tiniest leak to eventually cause problems.
At least without a ceiling I can now prove there are no more leaks.
Should be finished in two days.
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #55 on: 27 / September / 2009, 07:37:07 »
So here is the update. SDM works well.. I tapped a PC power supply - as I remembered that there is a 3.3V supply too..Some of the cameras do not come on, they say "replace battery" I assume that there is a voltage drop or some sort of a problem with the PSU.
This problem occurs when I have 52 cameras connected to the circuit..
I am now about to measure the current draw. I might consider getting a better quality psu for this project..
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #56 on: 27 / September / 2009, 08:17:51 »
Quote from: zcream on 27 / September / 2009, 07:37:07
This problem occurs when I have 52 cameras connected to the circuit..

Hardly surprising, as the load resistance is 1/52 of that of a single camera.

As a matter of interest, what is the resistance reading across USB V+ and ground with all cameras connected ?

I am very interested in seeing how this progresses.


David
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #57 on: 27 / September / 2009, 09:26:21 »
Voltage is about 16 K ohms. However, I cannot turn on more than 4-5 before they start switching off. Remarkably, the 3.3 V no load voltage is higher, and as voltage drops below 2.9V the A460s refuse to turn on. They turn on and off.
For the 5V it looks as if the load voltage is about 5.25V and some of them refuse to turn on.
I would say that 3-4V is a safe operating voltage range..

This is quite frustrating as I have 2 voltages on an extreme. I cannot put them in parallel as there will be a giant short due to the low internal voltage.. I am looking at 2N3055 NPN BJT for a 0.7V drop across the 5V terminal. Any experience with this ? It is rated for 115V..
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Offline Microfunguy

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #58 on: 27 / September / 2009, 10:03:59 »
Remind me of your setup.

How many A450's and how many A460's ?

What voltage do they each require ?

The commercial device that allows you to daisy-chain USB-triggering will be ideal for your application.

It will be available very soon.
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Offline zcream

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Re: DC Socket size on Canon Powershot models 1.1mm 1.3mm ??
« Reply #59 on: 27 / September / 2009, 10:05:00 »
I think I have it.. The PSU is rated at 190 watt for 3.3v and 5v combined. Lets assume its all over 3.3V.. For 16K ohms a current draw of 0.1A gives 160 watts.
DAMN!!!
I need a very high rated PSU to supply the current required..
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