This modification will allow you to control the motor speed of a Nerf Stryfe and thereby the impact force of the Nerf darts.
The Stryfe is my favourite Nerf gun, but like all electronic blasters in its stock form it is kind of weak. There are multiple instruction on the web on how to perform a voltage mod, but to change the speed you would always have to use different batteries. You might ask why would you want it to run on a lower speed? Well if you have ever heard how loud it is after the voltage mod the question answers itself. Also, to see your friends faces, when you crank up the speed is priceless due to the noise the gun is making.
As an added feature, the speed of the motors is indicated by nine LEDs on the side of the blaster.

Btw. if the only thing you would like to do is to run the Stryfe on 14.8 volts, just take a look at step 2.

Step 1: Stuff You Need


  • Nerf Stryfe
  • 5 mm thick ply wood (take a look at step 5)
  • Transparent red plastic
  • Optional: paint, plastic primer, modelling clay, filler
  • Hot glue, or sugru
  • Perf board
  • Silicone grease


  • Atmega 328
  • 7805 voltage regulator
  • 2 x 22pF, 1 x 47 and 1 x 100 uF capacitor
  • 16 MHz quartz
  • TIP120 npn darlington transistor
  • NPN transistor BC547
  • Relay
  • Si-Diode
  • Potentiometer 0-80 kOhm
  • 9 x 220 Ohm resistors, 2 x 10 kOhm resistors, 1 x 1 MOhm reistor
  • 9 straw hat LEDs, 3 red, 3 orange, 3 yellow
  • 4 x Li-ion cells 14500 (e.g. from UltraFire, on amazon: Batteries and charger)


  • Phillips screw driver (PH 0)
  • Drill and 5mm drill bit
  • Soldering iron, solder
  • Hot glue gun
<p>I have to hand it to Britt, that was an amazing build. Wanting to do something similar I started down the path of following the instructions for programming an Audrino and it seemed a lot more complicated than I wanted to get into, and a little beyond my skills, so I found a pulse width modulation speed controller online and it included a knob and LED display. I also included a volt meter for testing my battery levels.</p><p><a href="https://www.amazon.com/gp/product/B01MCWL4UX/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1" rel="nofollow">https://www.amazon.com/gp/product/B01MCWL4UX/ref=o...</a></p><p><a href="https://www.amazon.com/gp/product/B00R5UVF8Y/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1" rel="nofollow">https://www.amazon.com/gp/product/B00R5UVF8Y/ref=o...</a></p><p><a href="https://www.amazon.com/gp/product/B00CS2YP22/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1" rel="nofollow">https://www.amazon.com/gp/product/B00CS2YP22/ref=o...</a></p><p>I am running 6 Lithium surefire 3.6v type batteries in 3 series, 3 series, then wired those in parallel for around 12V and more amps. Worked perfectly.</p><p>The dial-a-speed knob is hilarious when I crank it up to 100 as it sounds like a harrier jet taking off. Stock motors still, but at this point I see no reason to upgrade them.</p><p>Here's how it turned out. Hit me up if you have any questions:</p>
<p>If i used three battries and a dummy of 3.7 volts, would I be able to leave the thermistor?</p>
<p>If i used three battries and a dummy of 3.7 volts, would I be able to leave the thermistor?</p>
I removed the thermistor but now the engine doesn't run when I pull the trigger. Was I supposed to short circuit the circuit with a wire?
<p>OK, HAPPY DAY. i got the mod to work sort of. everything works accept when i try to operate it without holding the button. does the relay have to be a special type (latching) or would it be more likely a problem in the code. I am pretty good with wiring, but don't know much at all about arduino coding. </p>
Hey I love the mod. It's coming together pretty well. I'm just having a little trouble with the layout on the two boards. I don't suppose it would be possible to see a more aerial view straight down on the circuit boards. Also I am not sure where you found a .47mF polarized capacitor. Or where the 22pF capacitors are on the diagram. Any help would be appreciated.
<p>Hi, try searching &quot;470 uF&quot;. I am sorry, I don't have an other image. I have attached an image showing you where the capacitors are. </p>
I thought that is what you meant by .47mF cause it's just written differently around here but when I tracked one Dow perhaps I have a wrong voltage but the 470uF capacitors were very large. I think I'll have to look for a smaller voltage or different brand. Thank you. I'm super excited about this mod but will admit the modeling was easy the electronics are giving me more trouble than I anticipated
<p>Few questions if you wouldn't mind. </p><p>1. I don't see the 22pF caps on the schematic you showed, where in the circuit do you put them?</p><p>2. Where does the battery pack connect? I only see a VCC 9v on the schematic.</p><p>3. Would it be fine to use a 100kOhm potentiometer?</p><p>Thanks for your time, I love your instructables! Going to favorite them and try quite a few.</p>
<p>Hey, where did you get your potentiometers? Is there a link that you have to where to buy these? Thanks!</p>
Hey just curious. Your list just has normal capacitors but the diagram shows polarized capacitors of a different rating. Also im a little confused by the placement and inclusion of the battery terminals in the box marked off as being part of the lower perf board. I just want to make sure thst wasnt a mistake and meant to be a capacitor. Thanks
Hi! You are right, except for the 22pF ones the capacitors are polarized. Also, the battery compartment is not part of the lower perf board. The VCC-symbol only marks the connectors on the board.
<p>ok cool, I'm pretty close to done once I swap them out for polarized ones. Am I just missing the 22pf capacitors on the diagram </p>
Hey, i was wondering what relay you used or, even better, if you could link one like it?
<p>Tr&egrave;s tr&egrave;s cool! spectaculaire, combin&eacute;e avec un travail de peinture de kick-ass.il ne manque plus ca intaler un lazer de 5mv.</p>
<p>Merci. Un laser serait bien. </p>
Do you speak English dominantly or parlez-vous fran&ccedil;ais?
Do you speak English dominantly or parlez-vous fran&ccedil;ais?
You made this mass effect stryfe. I see this EVERYWHERE in the modding community. Great job, how much will you take for it.
<p>Hi!!</p><p>Removing only the thermistor and using 3.7 volt batteries, the motor will increase speed? So the shoots will be stronger?</p>
<p>Wow, just Wow. Im stunned! Your modding is amazing! So clean and the paint job is amazing. Good job!</p>
<p>Could I replace the 80k ohm rotational potentiometer with a 100k ohm sliding potentiometer? Anyways, this is a great idea, I'm planing on integrating this into my Mass Effect replica Nerf Rayven. </p>
<p>Did you use electrolytic or ceramic capacitors?</p>
<p>Love it. Your are a genius. Can I buy one from you?</p>
I CANT LOOK ITS AWESOMENESS BURNS MY EYES (not really, but if awesomeness could burn out eyes, this would do it)!
<p>NERF needs to pay you for this design to manufacture these. In fact they just need to hire you to design all their guns.</p>
<p>Voted, and Blogged, see also the Carbon Fibre 3D printer:</p><p>http://faz-voce-mesmo.blogspot.pt/2014/02/imprimit-3d-em-fibra-de-carbono-e-de-2d.html</p>
Once again, very cool! Voted again! Your intro picture would make a good wallpaper! :)
<p>Thank you! I am playing around with my camera. I hope it is going to snow, since I would like to take a picture of the Nerf gun I am currently modding in it. </p>
Yeah, Nerf guns look great in the snow... Especially the Centurion with a snow camo mod!
Wow, cool! Yeah it's pretty cool to have NG's in the snow. I have a snow camo removeable cover for my Nerf Centurion in the NK3AE, and it is great for woodland concealment! ;)
<p>I'm Commander Shepard and this is my favorite mod on Instructables.</p>
Mass Effect, I like your style.
Ive seen a few examples of your work. Youre gifted.
Love that it's a Mass Effect gun
That.. Is literally the most beautiful need gun I've ever seen.. 0.0
<p>Wow, thank you!</p>
I have no words except epic! another great make!
cool I vote it!
<p>So great, Britt. I like the options to change the power up modes. Is this part of a larger costume? </p>
<p>Thank you! I wish. I made it among other Nerf guns for the Maker Faire in Groningen. A whole costume sounds like a great idea. </p>
<p>Very very cool! Another spectacular Nerf mod, combined with a kick-ass paint job. I love the LED bars! </p><p>Thanks for uploading your projects, this made my day. Say 'Hi' to the cameraman for me ;)</p><p>Now, how about some matching armour?</p><p><a href="http://www.volpinprops.com/n7-armor-dragoncon-2010-recap/" rel="nofollow">http://www.volpinprops.com/n7-armor-dragoncon-2010...</a></p>

About This Instructable




Bio: Hi, my name is Britt Michelsen, I'm a Chemical Engineer especially interested in Computational Fluid Dynamics. To balance all the theoretical work I like ... More »
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