Hey folks. So my son went to a Maker Faire where he was enticed into a soldering workshop in which, you guessed it, they were using the Larson Scanner kit! He got it for free! I was astounded how well he did. He's 5.6 years old. Yes it works. Yes he did 70-80% of the construction.
So then he wants to use it in his halloween costume. The long story short is, for it to work with the GB Proton Pack I've built for him, it needs to run off of a 9v battery.
I did some putzing around trying to figure out what the voltage and current requirements for the Larson Scanner are... but found A) that my multi-meter's DVA mode is hosed (probably a bad fuse), and
the controller chip for the kit has documentation that reads close to greek for me.
Sooooo ... I explored what it takes to bring 9v down to 3v and saw some hack solution to just add appropriate resistance. Not knowing the current, I was guessing so I started very high and dialed the resister value back down and down until it started working. Sort of. The scanner does scan, and the control button does control _speed_ ... but on the 9v battery with resistance, it does not seem to have the ability to switch between high and low brightness... which is honestly fine. But confusing.
I am a very green circuit guy. Physics classes and digital logic classes in college over 10 years ago are just enough foundation to fall off of. Honestly I had never soldered a circuit onto a PCB until this week... my son did it before I did. I'd only ever used solderless breadboards.
So give it to me straight: what is the quickest hackiest and yet still valid way to run the Larson Scanner off of 9v? And then, what is the most correct way to run the Larson Scanner off of 9v?
Thanks for the education!