Step 2: Build the 555 ic one-shot timer

The timer that controls the effects is based on the good old 555 timer chip. I used the low-power CMOS version.

You can adjust the amount of time that the timer stays on by varying the values of the resistor to pin 7, and the capacitor to pin 6.

Time (seconds) = 1.1 x R x C

It is a good idea to set up the circuit on a breadboard to get the bugs worked out prior to soldering. However, in my experience, things can behave differently once they are reassembled onto a circuit board. I had to adjust my component values a little bit once i built the circuit on perf board.

Image courtesy of Rob Paisley.
<p>So, did you use just 4 AAA batteries = 6v supply or one 9v and 2 AA's with two seperate power supplies? Do the schematics reflect actual resistors and caps used on Your build? The directions show several so I am confused how it actually works. Please clarify. </p>
I've been staring at these pictures for a couple days trying to make sense of it, but I've got no experience with electronics and timers, so I'm probably going to have to avoid circuits entirely and stick to push-button activation. Pulling the trigger would push the switch that completes the circuit, and it would remain on for as long as the trigger is held.
can someone tell me how much this is or i will eat a cat
how much did it cost to make this ?
My husband fell in love with this as soon as he saw it! Wonderful work! <br> <br>Too bad neither of us have an electronic know how. Anyone willing to make 2 for us? I can do everything after step 7, just need the lights and sound.
This is a sick star wars gun. I wish I could make one. <br>
Hey, <br> <br>Nice cirquit, but i need 2 of these and one 5 led chaser, can this be powered by one or 2 USB Ports? <br>And if so, how do i do it?
wow it looks just like the original prop:D
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cool project
Can I please have a parts list?
It would also be a nice idea to use the blue LEDs, instead of a chaser, to use them as a &quot;round counter&quot; to then just press a button to &quot;reset&quot; it. It's just something that came into mind while seeing how it works. Although it's really cool.
Thank you so much for the info on how you did your lighting effect -- I've been tinkering with a very similar idea (also tired of prop guns that make a wimpy sound and blink a single LED.) Nice to see the idea of combining a super-bright and a laser works so well. Can you share some info on the laser module and why you chose that particular one?<br><br>Oh, and there's enough on this page -- the assembly of the housing -- to warrant a full instructable on its own. You &quot;expoxied aluminum skin to the cone?&quot; Finding out more about how you did that, alone, would be worth the price of admission.<br><br>(I know...whine whine whine, more more more! :) )
how could i adjust this so that it worked like an republic blaster rifle?
cooool i want one
Very nice, but one thing I can't figure out is how you get the sound effect to play whenever you trigger it. I have the radio shack recordable module, but I can't figure out how to set it up so it will trigger when the power is switched on by the switch/trigger.
well, I honestly don't remember. But pin 3 is the output of the 555, so that should be wired to the base of the transistor. The collector is the positive, and the emitter is the negative side of the transistor, which you will wire up as the &quot;switch&quot; to activate the sound module. Sorry, I dont remember more specifics.<br><br>As far as making the sound play, mine just worked when triggered by the transistor. Maybe try removing the diode. Someone told me that I didnt realy need to use them. Although mine didn't work without them. And double-check the diode polarity.
Thanks to that help, I was able to get the 555timer chip circuit and the sound module to work perfectly. Again amazing job on the blaster.
the 555 one-shot triggers a transistor, which it wired to the &quot;play button&quot; on the sound module. pulling the trigger sets offf the 555 which turns on the transistors fro the various effects, one of which is the sound.
thank you for your reply, but how are the npn transistors (and the diodes) wired with the 555 one-shot? I'm having trouble looking at the images you have of the npn sequence to make out details on how it's wired. Is there a schematic you made?
About how much did it cost?
could you post a video of you using
Is there a way to create it without the sound?
Dont add the speaker... Remove it
Instead of using LEDs(light emitting diodes) Use a 5mW red Laser(light amplification by stimulating emission of radiation). It will go way farther<br />
If you look closely, you will see that I used both LED's and a laser.<br />
Pretty cool
wow great build 10/10! An other idea is if u used a 20-50mw green laser diode to see the actual laser beam <br />
Goodworkkeepitup.<br />
10 outta 10, good job dude, totally awesome.
&nbsp;I agree. totally awesome
Great project!!! I'd like to see about doing it myself, so I'm trying to lay out the entire circuit for all 3 functional blocks. I'm curious as to the final portion of the circuit, specifically the 3 chained NPNs. Can you post the outputs? Thanks.
I'm going to (well, at least try to) make the "clip" a battery pack with 2 contacts inside the gun so if "Luke" gets out of ammo (flat battery) he can reload, or just reload for the fun of it :)
does it actually shoot a laser ball sort of thing or is it a beam? that is really cool though.
iMac! W00t!!!
Where exactly does one find the 4017 decade counter chip? Thanks :) great instructable, too....very cool.
Radio Shack catalog # 276-2417. But if you can find a local electronics parts supplier, or tack it onto an order from Digikey or the like, it will be cheaper.
None of my local radioshacks had it, oddly enough........ =\ <br/>thanks anyway<br/>
A great place for electronics stuff is Rapid Electronics (just google it). I'm not sure whether they are UK only though... ZZZZ
you should look online
yup, got one online. It worked great once i cobbled everything together.
Yea, the shack is moving out of the Electronic parts... WTF? thats why they were established! Now you walk in there, they try to get you to buy the whole store! BTW... WONDERFUL L Instructable!
Very nice idea, well done, great clear instructable !
Awesome! I will try to make one!
Very nice!<br/><br/>I have a suggestion (I do not know the technical feasibility) you could put something that throws up a powder (flour, talcum powder) or smoke.<br/><br/>When it was launched the laser would appear as if the air like the films (because the light can only be seen when enter into contact with something). <br/><br/>What you think about it?<br/>=D<br/>
Awesome project! Congratulations on a well made blaster! What's up with the blue chaser though? Sometimes it seems to trigger much more chaotically than just the chase, then it's back to the regular dandy chase. Could it be if you trigger it again within the 1 second period?
Thanks, Yeah, I don't really know what's going on there. I think that the 4017 chip is really sensitive to "noise" or something. I couldn't solve it. Cheers, steve

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Bio: I am a web designer and broad-spectrum tinkerer.
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