Toolbox

Takira shows the thermistor

Thermistors are pretty cool little items. They convert heat into resistance. By having the temperature available as resistance, you can use the value to control other things like circuits and programs. Photo cells do the same thing with light, and they are in lots of common devices from night lights to dimmers on clock radios. […]

Screw heads demystified

Screw heads demystified

We can thank instructables user arcticpenguin for this excellent explanation of cross-head, cross-point, cruciform, and square drive screws and drivers! These screw types have a “+” shaped recess on the head and are driven by a cross-head screwdriver, designed originally for use with mass-production mechanical screwing machines. There are a few other recessed drive screws […]