John Lind said:
Another question . . . based on the original one that included the
OM-2[S,sp] in the list of bodies . . .
What is the trigger voltage of the Quick-Auto 300/310?
Reason for question:
High trigger voltages fry bodies newer than the OM-1n/2n.
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John, you apparently missed this post by Tim Hughes fronm Nov 10. I
replied that I was going to test my 250V Vivitar 283 on my OM-2s. I
haven't done it yet but will... so I hope Tim is right :-)
I thought there was also comment by Tim somewhere that said the QA 300
was a high trigger voltage flash but that the QA 310 was not. However,
I can't find the comment so maybe Tim will respond.
I was also surprised to discover (by actually reading the manual) that
my Minolta A1 is protected to 400V on the PC conctact.
Chuck Norcutt
Date: Wed, 10 Nov 2004 04:52:09 -0800 (PST)
From: Tim Hughes <timhughes@xxxxxxxx>
Subject: [OM] Re: E-1 and OM System flash units?
Chuck,
The Om2S and OM4's use a sensitive gate, high voltage thyristor switch,
so can easily withstand the <330V on the flash contacts (typ more like
200V for m,any flashes). The Om1/2 uses mechanical switch with test
insulation of 500V according to service manual. The Om2N uses
mechanical contact isolated by 1N4004 (400V ) diode. Anecdotally people
on this list have reported damaging OM4 in the rain with high voltage
flash. I am skeptical that this actually happened.unless somehow camera
ground came adrift from ccts, since the leakage path would have to get
to one of the ic's which are isolated from the thyristor gate by a
capacitor (from memory). On the other hand water could easily cause
other leakage problems as the insulation requirements for the
photo-sensors etc are extremely high.(probably > 100M Ohms)
Regards,
Tim HGughes
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