AK-270 データシートの表示（PDF） - Unspecified

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AK-270

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

Unspecified 

From the second pin of the ASW header, the alternating current passes through the 10µH

inductor (L1) and the 33pF capacitor (C4) as well as the 1N4148 diodes (D1 & D2) in order to limit

the pin voltage to about 0.3V to protect the chip from damage. This signal enters the HEX3653

chip at pin 4 (FM IN). This incoming signal is then compared to the reference signal received from

the on-board antenna which is a 32KHz crystal connected to pin 9 (RCLK).

The RCLK signal is controlled by the SEEK+ and SEEK- push buttons. The tuning, detection

and amplification of the signal is all done inside the HEX chip.

The audio output is at pin 12 (Lout) and 13 (Rout). Both signals are connected to the 10KΩ

resistors (R2, R3 and R4) and the DC blocking 100µF electrolytic capacitors (C1 & C2) to prevent

any DC signals with 0Hz frequency from passing through and causing distortion. This RC network

(resistor-capacitor) also functions as a high-pass filter that only allows the audio signal to pass

through and removes any unwanted noise.

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