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Registered Member #485
Joined: Sun Jul 09 2006, 01:14AM
Location: San Francisco
Posts: 36
I guess this is sort of a bump since I still have the same problem... I took a break from constructing my coilgun and just tried another shot at the optical triggering and still no luck... I have gotten the trigger to work with a mechanical switch but I would like to upgrade to optical... I am still using this scr (although i only have 2 left because i killed the others) I have used this as a schematic but for some reason I cant get it to work.
Registered Member #485
Joined: Sun Jul 09 2006, 01:14AM
Location: San Francisco
Posts: 36
I have referred to that website several times and the only schematic for an infrared switch is part of a pic based circuit. I am just looking for a basic one. Also I have used ohms law but for some reason it isnt working for me maybe its that schematic or there just something Im missing.
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Jason- can you explain a little bit why that isn't a good circuit for a coilgun? I planned on using that one, and I have it working to light up an LED- i was just going to add one more transistor to the circuit in a darlington fashion to get the required current for my SCR - the datasheet says 150ma, however i thought a safer bet would be to shoot for 250ma.
Registered Member #485
Joined: Sun Jul 09 2006, 01:14AM
Location: San Francisco
Posts: 36
So it looks like I can get both the IR switch and the scr trigger for the coil to work independently for the IR switch a volt meter shows ov when blocked and between 8-9 v when not blocked. I just cant seem to get them to work together... also I was wondering if either of these two circuits would work.. or
Registered Member #143
Joined: Sat Feb 11 2006, 04:25PM
Location: Austin TX, NorAm, Sol III
Posts: 28
Jasonr wrote ...
Anothercoilgunsite.com If I were you I would look around on this guys site he has some good documentation and schematics.
Joe, like mentioned above you need to use ohms law to match it to your gate current for your SCR. Also that schematic is not that great for a coilgun.
I was looking through this thread (eventually I plan to actually build a coilgun I've been collecting disposable cameras for ;)) and tried the link at hte beginning of your thread. Apparently that site does not want visitors from 4HV because instead of the page you linked to I got: just thought i'd share.
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a few switching questions
