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Mint-Tin Software Defined Radio

Screen shot 2013-01-23 at 11.13.06 AM

Steve, AKA Flickr user 3dking, built this mint-tin, PCB-less(!) SDR upverter, which switches your software-controlled Ham radio from VHF to HF. I built another up-converter, this time in to an Altoids tin and stuck a low quality label on the tin lid. This version includes the switching relay to connect... Read more »

Bug-in-a-Book

In this fun and easy project (which originally appeared in the Spy Tech edition of Make Magazine), you’ll connect a shirt-pocket “amplified listener” hearing aid with an in-car FM transmitter to create a wireless bug. Then you’ll tuck them inside a hollowed-out book with the microphone (mic) concealed by the... Read more »

Micro FM Transmitter

This circuit 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... Read more »

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