About a year ago my 4 year old son (3 at the time) was going through the monster phase at bedtime. Even with a night light and frequent checks under the bed, he was stressed out. For some odd reason, ...

I learned some basic electronics in high school physics class: resistors, capacitors, Kirchhoff’s law and such, and added only what was required for projects as I did them. Then around 15 years ago I ...