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AK-270

FM Radio Receiver Module D.I.Y. Kit (for Advanced Users)

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5. How It Works:

The kit that you’ve purchased is essentially a stereo auto-scanning FM receiver based on

a single HEX3653 chip that uses push buttons to adjust the volume, scan FM channels and power

ON/OFF. It requires two AA 1.5V batteries to power up; therefore, the operating voltage is around

3V in case an external power supply is used.

The circuit provides audio filters using capacitors and resistors (RC filters) to provide a

clear and high-quality sound when receiving a strong FM signal. The ASW (Antenna Switch)

header is used to choose the antenna. As radio waves are intercepted by the antenna, electrons

in the antenna begin to vibrate up and down. The antenna signal originates at the header pins.

Pin 1 on the header is for connection of an external antenna. Pin 2 is connected back to the

HEX3653 chip. Pin 3 is connected to the 3.5mm audio socket antenna shield which allows the

auxiliary cord to serve as an antenna. By adding the jumper sleeve over pins 2 and 3, the auxiliary

cord is used as an antenna. Adding the jumper sleeve over pin 1 and pin 2 allows us to use an

external antenna. The remaining fourth header pin is connected to ground. Since our

configuration has the jumper sleeve placement on pin 2 and pin 3, the auxiliary cord or

headphone cord is acting as the antenna, so the antenna signal is being received at the headers

from pin 3 and passed to pin 2.

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