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| Custom Light Gun Recoil - help needed |
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| ids:
Inspired by several threads here (and not wanting to hijack), I've decided to create my own gun recoil circuit (and thread). These will be going into Andy's Aim Track gun housing. I stumbled upon these at fleabay, and got two lots of 4 (8 total): http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=300538603887#ht_5358wt_1139 I haven't tried to jam them into the gun housing yet, but I think they should fit - might need a little encouragement in spots, but should be ok. So, the next part is getting them to fire. As you can see, the coil expects 18V. No problems, just need a wall-wart or something to provide that. However, we'll also need to isolate the 5V gun trigger from the 18V circuit (don't want to be taking any unnecessary chances here). Based on other threads here, I've learned quite a bit more and have started to cobble together a circuit for this. Some of my sources are shown in the following diagram, and also listed below. Any kind of feedback, validation, etc, would be hugely helpful - I really have no idea what I'm doing when it comes to electronics. Also, as mentioned I have 8 solenoids - but only two guns; if I figure this out properly, I could easily be encouraged to make a few extra and offer them up cheap. Please help (click on image for bigger pic). In particular R6 is a wild-ass guess. * Edit: The schematic below is crap, see follow-up posting for fix * TIP121 chosen because the local shop had a pile of them. LTV-816 chosen because I had several lying around. Caps chosen based on what I had, some guesswork, and some math (wrt 555 monostable) Sources, as shown in diagram - but clickable: 1) http://www.kpsec.freeuk.com/555timer.htm 2) http://www.technologystudent.com/elec1/5554.htm 3) http://doyle.wcdsb.ca/ICE3MI/Logic%20Gates/555%20monostable%20lesson.htm 4) http://www.fairchildsemi.com/ds/LM/LM555.pdf 5) http://www.national.com/ds/LM/LM555.pdf 6) http://forum.arcadecontrols.com/index.php?topic=108256.0 (Nerf Maverick ...Solenoid Recoil) 7) http://forum.arcadecontrols.com/index.php?topic=109029.0 (Q*Bert + MAME + Knockers) 8 ) http://www.epanorama.net/documents/wiring/wire_resistance.html Also, I suspect I could use the pc's 12V to fire this. This might also simplify things by allowing a common ground. If anyone wants to illustrate such a set-up, please do, it'd be great to show alternatives. However, I'm looking to cover all my bases with this, and not necessarily take the easy route. A selection of alternatives, simplifications, discussion on how to pick resistors/caps based on...??... etc would be a great and welcome addition to the thread. As does anything that helps while the above circuit is still on the breadboard and not soldered yet. Many huge thanks in advance. |
| ids:
Slapped together what's showing in above diagram - blew a fuse - some minor adjustments and all is well. I'll update diagram when I get a chance. There might be a better way, but this seems to do what i need: 1) If trigger is held, only a pulse is sent 2) Pulse is of a given time, regardless if trigger is released or pulsed for the duration 3) Solenoid circuit is isolated from the 5V triggering circuitry Next step, install in gun - details to follow |
| mytymaus007:
if you get this to work ill take one Let me no when your all done i have no clue what the hell your doing but it sounds Awsome :laugh2: |
| ids:
Thanks - I haven't much of a clue about what I'm doing either. I'll update schematic a bit later...damn work getting in the way ;D So far, however, with a pile of testing, none of the components is getting hot - I'll take that as a good sign. |
| ids:
Ok, here I've got the corrected schematic - this resembles what I have actually wired on a breadboard and have tested: You can click to zoom. If anyone knows anything about electronics, I'd love to hear from you (good, bad, indifferent, troll, random insult, validation, improvements, whatever you've got). I will follow this up with an attempt to get it all going in the Ultimarc gun shell. |
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