Three new circuits for physical computing. There are 3 circuits on this breadboard, from top to bottom – transistor toggle – the LED’s toggle when the switch is pressed, astable multivibrator – the LED’s fade in and out one at a time, voltage divider – the LED turns on in the dark. Additionally, I did my first soldering job, we had to solder header pins on to the power adaptor so it can power the breadboard.