I posted a how to video focusing on a rock candy controller a while back. The mod I walked through was about adding leds to the controller to give it some flare! A few people asked if I can make a rapid fire mod how to. And I did just that! I designed a small circuit using a 555 timer and a few componets to get a fantastic result. The timer circuit had to run off of 5 volts and had to have a very nice fast output wave. After an hour or so bread boarding I came up with this! There is a small demo at the end of the video. This circuit is easy to make and easy to add to the controller. watch the video for the steps and check out the pictures for the schematic. I only tested this on CoD. Check out my facebook page https://www.facebook.com/Electricreations
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