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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Camera Flashes
Date: Fri, 06 Dec 2002 06:10:50 GMT
Organization: MindSpring Enterprises
References: <email@example.com> <firstname.lastname@example.org>
X-Server-Date: 6 Dec 2002 06:10:07 GMT
X-Newsreader: Forte Free Agent 1.21/32.243
>>>Found them, the specs look right, the price is right. I'm not married to
>>>any particular design right now, but I have absolutely no experience with
>>>these parts. My skill might be described as "electronics lite". I was
>>>hoping for some sample circuits to study, but the on-line data sheet
>>>wasn't very helpful. Is it as simple as a 5mA input across pins 1 and 2,
>>>and that will turn on up to 400V, 1A AC across pins 4 and 6?
>>>Looking at http://rocky.digikey.com/WebLib/Lite-on/Web%20Data/MOC302x.pdf
>>>I suppose that's what the circuit at the bottom shows, but with a filter
>>>between that and the load.
Yup, it's that simple. :-)
The circuit shows the MOC302X being used as a triac driver...you'll be
using it directly. And they show the input being driven by that
transistor. Any method that supplies at least 5mA (but way under the
50mA limit) will drive that chip...even a 9V battery with a 1K
resistor. The battery will be dead about the time the current drops
BATT(+)-----\/\/\----| |--- FLASH
1K | MOC |
| | 302X |
| --| |--- FLASH
The 1-amp rating is a 1mS peak rating only so I'd limit the output to
significantly less than that if it's going to be continuous. Your
flash sync application *shouldn't* be a problem.
There is still a chance that the MOV won't fire your flash units (or
the unit will fire but the triac will stay conducting ("on") because
the sync voltage never dropped to zero when the flash fired.
I'd pick up a MOC3022 or MOC3023 at Radio Shack and give it a quick
try with a 9V battery and a 1K resistor just to make sure it works
before you spend any more money or time designing the circuit with
these chips...just in case.
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