The analog world

Powering the computer

• 3.3 V voltage regulator (see p 4 for circuit)
• USB port power supply
• SparkFun Breadboard Power Supply USB
• Inside the wall wart

Current limiting resistor

• LED circuit
• LED calculator

Controlling motors

• DC Motors with PWM
• Servo motors (See the pulse section)
• DC Motor reversing with an H-bridge
• Stepper motors

Smoothing the PWM

• PWM to true analog
• Low-pass filter and some nice pictures
• Pulse-density modulation

Amplification

• Transistors from SparkFun
• One transistor audio amplifier from Bryan Duxbury’s blog
• Op Amp basics from Henry’s Bench
• I²C PWM/Servo driver
• Many examples with transistors and relays from the University of Minnesota ME2011