Guys, The purpose for the remote is to activate a cable release with a gear-motor drive. The motor turns a cam that presses the cable release. I need a distance of no more than 20 feet. I have been using an air-bulb type but it is visible in the photo. I also have used the guts from a toy RC car. That was too gizmo! I'm wanting it to be as off-the-shelf as possile - "Not one, but two for only $19.95 plus shipping!" I'll investigate whether "clapper" switches may do the job at lower voltages. Seems to me that a cheap laser pointer activated switch would be a best seller. Where's Ronco been on this? Thanks all, AZ Build a 120/35mm Lookaround! The Lookaround Book. Now an E-book. http://www.panoramacamera.us > -------- Original Message -------- > Subject: [SPAM] Re: more DIY > From: Stephen Ylvisaker <stephen@xxxxxxxxxxx> > Date: Thu, October 23, 2008 5:21 pm > To: List for Photo/Imaging Educators - Professionals - Students > <photoforum@xxxxxxxxxxxxxxxxxx> > I understand why you might think that. But the description is more complicated than the doing, in a way. I presume you'd wish the relay to trigger with ordinary battery voltage of between 3 and 12 volts, and be able to handle 120 volts, to run the motor, through the relay contacts. A couple of simple relays from Radio Shack, along with your flash trigger would do the job. I bet if you know a certified electrician, he'd be able to put it together for/with you. > You've built a camera; this is no more difficult, except it involves a different area of experience. > A "clapper" switch could, logically, do the same, with the appropriate resistor to lower the voltage to what you desired. What sort of distance were you thinking of for activating the trigger? The laser pointer would effective at a greater distance than sound. > Stephen > ----- Original Message ----- > Hmmm, > Starting to get tricky. There are all kinds of 120 V. "clapper" > switches. I wonder if they have a circut that drops voltage from line > current that could be bi-passed? > Thought of a goofy level idea. I stick the camera on a monopod and > raise it high overhead. I could have a plumb-bob down the center and it > would ground when it touched the sides of the tube. > AZ > > -------- Original Message -------- > > A latching relay is simple to make. Select a relay with one contact set (at least) that makes contact, when the relay operates, before the other side breaks contact; ie. a make-break contact set. The power/voltage to trigger the relay, after the light sensor was triggered, could go through the break contacts, and the power/voltage to hold the relay operated would go through the make contacts. I'd suggest a second, momentary relay to be triggered to reset the circuit to the original state. > > Stephen > > ----- Original Message ----- > > The laser remote switch for a flash would be momentary - I'd need a > > latching relay to keep the circuit closed, which might be do-able. It's > > to turn a motor on and off. > > AZ > >
