Building the Raspberry Ripple
What you are going to make next is the Raspberry Ripple, an analog input/output board. In electronics, the word ripple is used to denote small, often rapid, changes in a voltage. This board is going to look at changing voltages, hence the name. After you’ve made it, you can make a whole range of projects with analog signals. We show you some examples at the end of the chapter.
Here are the parts you’ll need to build the Raspberry Ripple:
1 2.8"×1.7" copper strip prototype board.
1 16-way DIL IC socket.
1 PCF8591P 8-bit A/D and D/A converter.
1 2N2222 NPN transistor.
1 1N4001 diode (or any other diode).
2 47uF capacitor 6V8 or greater working voltage.
1 1K wire-ended resistors.
5 3-way PCB mounting terminal block with screw connectors.
Note the Phoenix contact–PT1,5/6-5.0-V–terminal ...