sonodrome

Make: Projects – Micro FM Transmitter

Make: Projects – Micro FM Transmitter

This transmitter is commonly credited to Japanese multimedia artist Tetsuo Kogawa. It takes audio input through a 1/4? phono jack and, constructed as shown, without the optional antenna connections, will broadcast an FM radio signal about 30 feet.

This is the standard model of Mr. Kogawa’s simplest FM transmitter, which is slightly more complex than his most basic design in that it includes a trim capacitor to adjust the transmitting frequency. It can be powered by a 9V battery and uses a hand-turned copper coil.

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Make: Projects – POSC handheld audio oscillator

Make: Projects – POSC handheld audio oscillator

When you first turn the POSC on, the LED will light for a fraction of a second. If you’ve got it hooked up to an amplifier, it’ll also squawk for a second. Playing it is as easy as licking your finger and tapping, rubbing, pressing, or smearing it across the two contacts. The amount of incident light on the photoresistor controls the frequency, so experiment with playing it under different lighting conditions. Jim and Kat have produced a bunch of software for digital post-processing of the POSC signal. For mroe info, see the Sonodrome website.

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Sonodrome: Inspiring entrepreneurship in hobby electronics

That said, there’s almost nothing we like to see better than a maker hanging out a shingle and selling their own handiwork. Finding these people and helping to promote their work was the single biggest reason we launched Makers Market. If you’re on the fence about hanging out your own shingle, give it a look and/or drop me an e-mail, and let’s talk. Likewise, if you’re ready to take the plunge but could use a bit of start-up cash, consider entering our Gadget Freak Design Contest. It’s been running for a couple of weeks, now, but the pool of entrants is still small, and the pool of truly impressive entries is smaller still, so there’s a very real opportunity there for the right clever person with the right clever idea. First prize is $1,000 in cash and guaranteed admission to Makers Market.

Continue Reading Sean Michael Ragan