Smartphone Signal Generator
By Jacob Beningo ■ Illustrations by Julie West
You will need
Stereo headphone plug, 3.5mm
Wire, 1-conductor, insulated, 28-gauge solid, 8" or custom length (3)
Insulated alligator clips, red (2)
Insulated alligator clip, black
Smart device with headphone jack
A signal generator is handy to have around the lab. It’s perfect for testing inputs on a new hardware design; use it with an oscilloscope to verify the behavior of your circuit. Turn a smartphone into one for less than $15!
1. Wire the adapter.
Unscrew the cap from the 3.5mm plug. Strip ¼" of insulation off the ends of each wire. Solder one wire to the ...
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