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The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin package. With only a few external components, a simple radio with excellent selection and reception can be constructed. Since the chip also uses a low supply voltage of only 1.3V, 3V coin cell battery can make for a physically small circuit with many covert uses. The chip has a wide bandwidth of between 150KHz and 3MHz, so by playing with values in the tuning circuit you can pick up a wide variety of signals.

R11100K 1/4W Resistor R21470 Ohm 1/4W Resistor R311K 1/4W Resistor C110.04uF Ceramic Disc Capacitor C21365pF Variable Tuning Capacitor C310.01uF Ceramic Disc Capacitor D1, D221N4148 Signal Diode U11ZN414 Radio ICMK484 L11See Notes MISC1Board, Holder For Batteries, Wire, Coil Form For L1