OK so I've been working on a project with an MSGEQ7 (https://www.sparkfun.com/products/10468) to drive an LED strip. I'm currently trying to simplify everything into one package. I had previously been powering the MSGEQ7 with the arduino 5v as that's what it runs on. Since I was planning on just moving to a standalone ATMega328 (with a resonator) I was learning about supplying 5v from an outside power source (in this case a 12v wall wart that also powers the LEDs). This led me to this Beginning Embedded Electronics - 1 - SparkFun Electronics sparkfun tutorial about the 7805.
I promptly hooked it up and got everything working. To test it out I powered up my arduino using it. No problems. So then I set up the MSGEQ7 and hook it up to the power and the arduino just as before, except this time the 7805 is providing the 5v. No go. So I fool around trying to find the problem. Turns out the MSGEQ7 got fried. I have a spare so I change some things around and try again. Same problem.
Does anyone have an idea as to what I might be doing wrong? The only differences between working and not is whether it is powered by the arduino or the 7805.
I tried hooking up the arduino to the 12v and then using the onboard 5v regulator to power the MSGEQ7, ended up with the same result. Must be something about this 12v supply. Anyone have any thoughts?
Does anyone have an idea as to what I might be doing wrong?
Did you measure the voltage output of the 7805 with a multimeter before you attached the MSGEQ7 ?
I don't have a multimeter (on order right now) but I checked in against the arduino 5v (A0 analog input spit out to the serial monitor) and it reads 5.0v...