Hardware Reference
In-Depth Information
Transistors and Diodes
The 2N3904 is a common NPN transistor that you can get almost anywhere. Even Amazon
has it. Adafruit has a nice 10-pack. SparkFun lets you buy them one at a time. DigiKey will
gladly sell you 100,000.
The 1N4001 is a popular 1A diode. Buy one at SparkFun , 10 at Adafruit , 25 at Radi-
oShack , or 40,000 at DigiKey .
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