rotomotor
20-Feb-2012, 16:38
Hi,
I've been on a quest to put a shutter behind a 42cm Heliar on a 9" lensboard so that I can shoot portraits more easily and use flash sync. Last week, I bought a shutter on ebay that had the rare opening that the Heliar needs: BIG. It arrived Saturday, and by last night I actually had a working shutter with flash sync. Incredible progress for such a short period of time. Of course my partner would like me to pay attention to her and not just talk about shutters and flash sync. However, I digress.
This shutter has a solenoid on it that after trying many different batteries, and DC wall adapters, I found that it works with both 12V and 24V DC power. So far, I am using my enlarger timer at .2 seconds which results in a fastest shutter speed of about 1/4 second. For flash sync, I went to a local surplus store and found a micro switch. Low and behold, the switch is wired to the end of a pc sync cable and it works! I made a test 8x10 last night and it looks great.
Here's what I would like to do:
If possible, use a battery to drive the shutter. Will a rechargeable battery put out 12V 500mA for a few minutes of focusing and a few shutter activations?
Use a timer, perhaps like a 555 timer and add selector switch to choose between my fastest speed of 1/4, then 1/2, 1, and bulb
Attach some sort of push button, or even better, a remote control so I can have more batteries and complexity to fail :D
Maybe just a wired switch!
I'm amazed that I've made it this far as I am just a hack with epoxy, tape, and DC power supplies lying around. Can someone point me in a good direction to bring this up a step so I can lose the enlarger timer, and go to battery power if possible? I can follow specific directions well, design a timing circuit on a breadboard? Iffy at best!
68642
68643
68644
68645
Any expertise in electrical engineering is MOST APPRECIATED!
Thanks,
Scott
I know that this has been covered before with slightly different variations but I don't think my specific task has been covered. Other reference threads that I've found on the subject:
http://www.f295.org/Pinholeforum/forum/Blah.pl/Blah.pl?m-1237050311/
http://www.apug.org/forums/forum147/30500-packard-shutter-mods.html
I've been on a quest to put a shutter behind a 42cm Heliar on a 9" lensboard so that I can shoot portraits more easily and use flash sync. Last week, I bought a shutter on ebay that had the rare opening that the Heliar needs: BIG. It arrived Saturday, and by last night I actually had a working shutter with flash sync. Incredible progress for such a short period of time. Of course my partner would like me to pay attention to her and not just talk about shutters and flash sync. However, I digress.
This shutter has a solenoid on it that after trying many different batteries, and DC wall adapters, I found that it works with both 12V and 24V DC power. So far, I am using my enlarger timer at .2 seconds which results in a fastest shutter speed of about 1/4 second. For flash sync, I went to a local surplus store and found a micro switch. Low and behold, the switch is wired to the end of a pc sync cable and it works! I made a test 8x10 last night and it looks great.
Here's what I would like to do:
If possible, use a battery to drive the shutter. Will a rechargeable battery put out 12V 500mA for a few minutes of focusing and a few shutter activations?
Use a timer, perhaps like a 555 timer and add selector switch to choose between my fastest speed of 1/4, then 1/2, 1, and bulb
Attach some sort of push button, or even better, a remote control so I can have more batteries and complexity to fail :D
Maybe just a wired switch!
I'm amazed that I've made it this far as I am just a hack with epoxy, tape, and DC power supplies lying around. Can someone point me in a good direction to bring this up a step so I can lose the enlarger timer, and go to battery power if possible? I can follow specific directions well, design a timing circuit on a breadboard? Iffy at best!
68642
68643
68644
68645
Any expertise in electrical engineering is MOST APPRECIATED!
Thanks,
Scott
I know that this has been covered before with slightly different variations but I don't think my specific task has been covered. Other reference threads that I've found on the subject:
http://www.f295.org/Pinholeforum/forum/Blah.pl/Blah.pl?m-1237050311/
http://www.apug.org/forums/forum147/30500-packard-shutter-mods.html