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Pistnbroke
2nd January 2015, 04:50 PM
Just had a letter from Olympus saying the voltage is 250v..so will carry out some tests with different flash guns later and let you know.
The 25v in the manual must be a misprint. This indicates that the firing device is an SCR which if overvolted conducts without damage..

Thank you for your email regarding your OM-D E-M10 camera.

I can confirm that the maximum voltage of the hot shoe of this camera is 250 v.

Should you require any further assistance, please do not hesitate to contact me and I will be more than happy to assist you further.

Kind regards
Edita Warlopova
Technical Care Specialist

Graham_of_Rainham
2nd January 2015, 07:23 PM
Some of my old guns trigger voltage is 360 Volts.
One I've measured at 445 Volts :eek:

Having taken apart lots of flash guns, most have 600V Capacitors in them, so be a bit careful with anything even a little be "precious"

Pistnbroke
2nd January 2015, 07:34 PM
if I bother I may send you details of adding an SCR to an old flash gun to reduce the voltage to acceptable levels.

Jim Ford
2nd January 2015, 08:32 PM
be a bit careful with anything even a little be "precious"

Including your life!

Jim

Pistnbroke
2nd January 2015, 09:00 PM
the world is full of nay sayers

Jim Ford
2nd January 2015, 10:07 PM
the world is full of nay sayers

... and the morgues full of corpses!

;^)

Jim

Pistnbroke
2nd January 2015, 10:13 PM
Perhaps when I have fitted the neccessary electronics to modify a "300v" unit down to 5v I will not bother to tell you ....after all its only an SCR and a couple of diodes....you all sound so clever you could do it yourself.

Ross the fiddler
3rd January 2015, 01:08 AM
Perhaps when I have fitted the neccessary electronics to modify a "300v" unit down to 5v I will not bother to tell you ....after all its only an SCR and a couple of diodes....you all sound so clever you could do it yourself.

I'd be interested in seeing a circuit & components used, meanwhile the less technical & cautious people I would advise using the 'Safe-Sync' hot shoe adapter (assuming it can control those higher voltages) that I had linked to in this thread. http://e-group.uk.net/forum/showthread.php?t=35936 It has all the necessary connections on it too.

I know charged capacitors can hurt (& not good if discharged between left & right hands), but I do remember the silly things we used to do like carefully charging a high voltage rated capacitor & then tossing it to someone to catch. :rolleyes:

Pistnbroke
3rd January 2015, 08:19 AM
This is the gun I have chosen to modify ..though I only paid 5.99 inc post.
http://www.ebay.co.uk/itm/111558864486?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
It is small for the pocket , is low to the camera which is good for shadows though as you know with a flash in the shoe you can only use landscape shots or you get bad side shadows.
For those not familiar the light does not bounce back to the camera sensor but bounces back to the sensor on the flash gun ..hence the little window below the flash, This cuts off the flash when the exposure is correct. This one has three settings or aperture choices ...so use would be select on the M10 iso say 200 speed 1/60 and aperture say (from dial ) f 5.6 and off you go .flash iso and aperture is set to match...
What I dont know is if there is enough room in the removable foot to fit the neccessary components ...watch this space ..give me a week.

Jim Ford
3rd January 2015, 01:51 PM
I'd be interested in seeing a circuit & components used

If I were to use the DIY approach I'd probably be looking at an opto-isolator, rather than discrete components'

Jim

Ross the fiddler
3rd January 2015, 08:55 PM
If I were to use the DIY approach I'd probably be looking at an opto-isolator, rather than discrete components'

Jim

Yes, I've used them (years ago) in lighting control before. It does at least isolate the high voltage completely if there is any risk with it.

Pistnbroke
3rd January 2015, 09:10 PM
you seem to be taking about an opto isolator rather than an optically triggered SCR..no use ..with the optical trigger in the shoe the built in flash will not come up enough to trigger..not what I want anyway.

Pistnbroke
16th January 2015, 10:03 AM
Put a few notes on this in the flash section