D.I.Y .
MOBILE
Your cellphone offers huge possibilities with just a paper cone, battery, and a few wires.
You, too, can bring anonymous voices into public Solder It spaces, stage an anonymous protest, or speak 1. Cut the perf board to size and solder the to the masses without revealing your identity. LM386 in the middle.
Photograph by Daniel Jolliffe
I’ve created a grander version of this anonymous 2. Drill a hole to the end of the board, to tie-wrap megaphone (see Made on Earth, page 16), but a the battery and headset cable. cellphone, some construction paper, a battery, 3. Solder in the battery clip and headset wires. and a few wires can easily do the trick. With a cable from a cheap headset, you’ll have to
Turning your cellphone into an automatic mega- heat the wire until the enamel covering the wire phone is a snap. I’ll show you how to build an unat- melts. Tie-wrap them to the board. tended megaphone that projects a caller’s voice 4. Identify the headset cable connections. The up to 30 feet — it all depends on how big a horn plug’s sleeve goes to ground, the ring is the you make. It should take about two hours to put phone’s speaker, and the tip is its microphone. together, assuming some familiarity with soldering 5. Connect a 1-10KΩ resistor between the tip wire and basic electronics, and cost you $5 to $10. and ground. This fools your cellphone into think-
Once you get all the parts together (see table ing that a headset is connected. You may have to on next page), there are basically just two simple experiment with different values (I used 2.2KΩ). steps on the road to anonymous oration. 6. Solder in the rest of the capacitors and the
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