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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 14 Mar 2012 (Wednesday) 01:06
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DIY AC power supply for Canon Speedlights

 
vk2gwk
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Mar 14, 2012 01:06 |  #1

I bought two "switched" powersupplies each 6V DC at max 4 Amp. and made a small adapter that fits in the battery compartment.
To limit the inrush current (after switch on or flash) you need 1 ohm limiter resistor in series (or like I used 2 x 0.47 ohm).

See the photos:

IMAGE: http://farm8.staticflickr.com/7189/6834536808_bf61222d5c_b_d.jpg

DIY power supply on Flickr. (external link)

The photos on Flickr have some "notes" that further clarify some points.

My name is Henk. and I believe "It is all in the eye of the beholder....."
Image Editing is allowed. Please explain what you did!
Canon R5, 5D MkIV 5DMkIII, 50D, 24-105/1:4 + RF70-200mm F/2.8L IS USM + 100-400/4-5.6L IS USM + 50mm 1.4 USM + Sigma 150-600mm Sports + 580EXII + 430EX + YN568EXII, triggers, reflectors, umbrellas and some more bits and pieces...
Photos on: Flickr! (external link) and on my own web site. (external link)

  
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OneJZsupra
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Mar 14, 2012 08:06 |  #2

Is that a block of wood?


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msowsun
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Mar 14, 2012 10:30 |  #3

What is the recycle time like? How does it compare to fresh NiMh's or to the CP-E4?


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bdillon
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Mar 14, 2012 10:44 |  #4

If you made a casting of 4 batteries taped together you could easily embed some leads and the wire in some casting resin and end up with a really nice power slug to stick in there. The block of wood made me LOL. Very creative.




  
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vk2gwk
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Mar 14, 2012 15:06 |  #5

seoul4korea wrote in post #14084047 (external link)
Is that a block of wood?

Yes and that took a lot of filing and milling so for the next one I found something easier.

msowsun wrote in post #14084760 (external link)
What is the recycle time like? How does it compare to fresh NiMh's or to the CP-E4?

Recycle time is the same as for fresh batteries.

bdillon wrote in post #14084827 (external link)
If you made a casting of 4 batteries taped together you could easily embed some leads and the wire in some casting resin and end up with a really nice power slug to stick in there. The block of wood made me LOL. Very creative.

Thought about that but it would be rather a lot of work for two. But might be feasible for a photography club or group.


My name is Henk. and I believe "It is all in the eye of the beholder....."
Image Editing is allowed. Please explain what you did!
Canon R5, 5D MkIV 5DMkIII, 50D, 24-105/1:4 + RF70-200mm F/2.8L IS USM + 100-400/4-5.6L IS USM + 50mm 1.4 USM + Sigma 150-600mm Sports + 580EXII + 430EX + YN568EXII, triggers, reflectors, umbrellas and some more bits and pieces...
Photos on: Flickr! (external link) and on my own web site. (external link)

  
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bdillon
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Mar 14, 2012 15:25 |  #6

Work, no. It's super easy.....however buying the supplies would cost you around 50 bucks so it wouldn't be very cost effective, so probably better suited for a group thing. I'm actually considering doing this using a casting of 4 batteries to make a slug, and using a lead with a disconnect to allow for stress relief. Then I could use my 580s with my VML, which would be nice. Where did you get the power supplies from?




  
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vk2gwk
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Mar 14, 2012 16:28 |  #7

bdillon wrote in post #14086349 (external link)
Work, no. It's super easy.....however buying the supplies would cost you around 50 bucks so it wouldn't be very cost effective, so probably better suited for a group thing. I'm actually considering doing this using a casting of 4 batteries to make a slug, and using a lead with a disconnect to allow for stress relief. Then I could use my 580s with my VML, which would be nice. Where did you get the power supplies from?

I agree that a casted slug would look nicer and the resistors can be put inside as well. But I just used a piece of timber for the first one (and filed and filed away...) and the bottom of a flat conduit strip for the second. Just some parts I had in the junk box.

The power supplies were about AUD $15 each from a mail order supplier here in Australia but would be available from numerous outlets, I guess.


My name is Henk. and I believe "It is all in the eye of the beholder....."
Image Editing is allowed. Please explain what you did!
Canon R5, 5D MkIV 5DMkIII, 50D, 24-105/1:4 + RF70-200mm F/2.8L IS USM + 100-400/4-5.6L IS USM + 50mm 1.4 USM + Sigma 150-600mm Sports + 580EXII + 430EX + YN568EXII, triggers, reflectors, umbrellas and some more bits and pieces...
Photos on: Flickr! (external link) and on my own web site. (external link)

  
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bdillon
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Mar 14, 2012 17:38 |  #8

vk2gwk wrote in post #14086728 (external link)
I agree that a casted slug would look nicer and the resistors can be put inside as well. But I just used a piece of timber for the first one (and filed and filed away...) and the bottom of a flat conduit strip for the second. Just some parts I had in the junk box.

The power supplies were about AUD $15 each from a mail order supplier here in Australia but would be available from numerous outlets, I guess.



The casted slug is more for myself and protection of my equipment from me. I'm usually careful but there are times when I've reversed polarity and ruined things (just got in a hurry). I'm not sure if the 580EX II has something built in for protection or not.....I would assume it does but I don't want to find out the hard way. If I did a slug with leads on the bottom two batteries, then it would be impossible to reverse polarity no matter how I inserted it.

I'm having a hard time finding 4 amp versions of a 6v power supply.......




  
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hammer2k
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Mar 14, 2012 18:13 |  #9

Maybe you can use a wooden dowel cut in 4 sections and then glued together to form the core.




  
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imsellingmyfoot
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Mar 14, 2012 18:28 |  #10

How are you keeping the resister cool?


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CanonCameraFan
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Mar 14, 2012 19:45 |  #11

I don't recall which flash I did it to years ago; but I simply installed a bulkhead RCA Female Connector on the Flash, and soldered the inside leads to the Battery Input Contacts. An RCA to RCA Cable would connect to my Quantum. In your case, you could solder an RCA Male Plug on your Power Cord.

Cheap, Neat, Easy. Drill 1 hole and solder the the 2 RCA's.... :)


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vk2gwk
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Mar 14, 2012 19:52 |  #12

imsellingmyfoot wrote in post #14087399 (external link)
How are you keeping the resister cool?

They don't get really hot and are of 5W rating and can still be touched after 5 flashes in 10 seconds on full capacity. They limit the inrush but once the capacitor is charged there is only 10 - 20 mA running or so. That means that when not flashing the power dissipated by the resistor is only milliwatts.


My name is Henk. and I believe "It is all in the eye of the beholder....."
Image Editing is allowed. Please explain what you did!
Canon R5, 5D MkIV 5DMkIII, 50D, 24-105/1:4 + RF70-200mm F/2.8L IS USM + 100-400/4-5.6L IS USM + 50mm 1.4 USM + Sigma 150-600mm Sports + 580EXII + 430EX + YN568EXII, triggers, reflectors, umbrellas and some more bits and pieces...
Photos on: Flickr! (external link) and on my own web site. (external link)

  
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klr.b
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Mar 14, 2012 20:52 |  #13

vk2gwk wrote in post #14086201 (external link)
Yes and that took a lot of filing and milling so for the next one I found something easier.

hammer2k wrote in post #14087319 (external link)
Maybe you can use a wooden dowel cut in 4 sections and then glued together to form the core.

^^ This should save you a bunch of time. Just go to an art supply store and buy a wooden dowel and cut it to size.


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MrScott
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Mar 14, 2012 20:57 |  #14

You could go portable with a 6v SLA battery that's just a pound or two, but will give you hundreds of pops. Keep it in a P&S camera bag for a semi-custom DIY.

Speaking from first hand experience, don't forget the resistor....




  
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vk2gwk
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Mar 14, 2012 21:03 |  #15

hammer2k wrote in post #14087319 (external link)
Maybe you can use a wooden dowel cut in 4 sections and then glued together to form the core.

That is a good idea when you can find the right diameter (same as a AA battery). But you still will have to free some space to put the resistor(s) in.

MrScott wrote in post #14088255 (external link)
You could go portable with a 6v SLA battery that's just a pound or two, but will give you hundreds of pops. Keep it in a P&S camera bag for a semi-custom DIY.

Speaking from first hand experience, don't forget the resistor....

I would think that with a SLA battery you don't need a resister because the internal resistance of the SLA is able to cope with the inrush. (Same as NIMn but even better). Of course if you have fuse in there it should be 10Amp or more, I guess ( or a slow blow).


My name is Henk. and I believe "It is all in the eye of the beholder....."
Image Editing is allowed. Please explain what you did!
Canon R5, 5D MkIV 5DMkIII, 50D, 24-105/1:4 + RF70-200mm F/2.8L IS USM + 100-400/4-5.6L IS USM + 50mm 1.4 USM + Sigma 150-600mm Sports + 580EXII + 430EX + YN568EXII, triggers, reflectors, umbrellas and some more bits and pieces...
Photos on: Flickr! (external link) and on my own web site. (external link)

  
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DIY AC power supply for Canon Speedlights
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