16 volts and a LM7805? Answered

I was wondering I'm making a very tiny project with that requires 5v. I'm using these little 3v batteries (CR2016). If I use like 6 of those and a 5v regulator, approximately how fast will they drain? Is that not a good way to lower the voltage? 

Question by HavocRC   |  last reply


Either NY Times is wrong or Esquire got scammed big time

The New York Times states that Esquire had to invest seed money (six figures according to a couple blogs) for E Ink to develop a battery thin enough for a magazine cover...I'm sure everyone who's already cracked one open can tell you, they are powered by standard CR2016 batteries, not some magic million dollar tech...dude, Esquire may have gotten PWNed big time.

Topic by gschoppe   |  last reply


I think someone has hidden a tracker on my bike to locate and steal it.

I have a cargo bike that is pretty exspensive. I found a small item under my dogs seat . It was not like purposely concealed but I may not have found this thing for a while .  It looks like a  small kids flashlight . It had a blue rubber cover with a happy face on it .But it is not a flashlight . It is about 2 inches long and 3/4 of an inch wide . When  you remove the cover there is a - a meta-dv1 circuit board - a small blue led which was wrapped in a cover that said 125 degrres c on it - 2 lithum cr2016 batteries  Please help me figure this out . I have a invisible chronic illness that caused my drivers license to be revoked. My bike is my life line to the world . I need to know if some organized group of theives is trying to track me.  Many Many Thanks to anyone who can help    

Question by dapper dad    |  last reply