FN-BC20 20 Buttons Triggered MP3 Sound Board for KITT Sound Effect

1. Brief Introduction
FN- BC20 is a high quality MP3 sound board developed by Flyron Technology Co., Ltd.  Equipped with an on-board 2x 15 W class D amplifier, the sound board can be controlled by 20 separate buttons hooked up to the ‘one-on-one’ inputs terminals, R232 serial port and RS485 serial port. Great audio output, industry-grade design and strong anti-jamming capability make it possible to be used for many different applications.
 
2. Product Features
1). Built-in a high quality 24bit of audio decoder with stereo audio output.
2). Supports to play audio files of MP3 and WAV formats.
3). On-board a high quality 2x15 Watt class D amplifier to directly connect with two 8 ohm speakers of 15 Watts
     or more, for left channel and right channel.
4). Uses SD card or USB flash drive for sound file storage devices.
5). Supports maximum 32GB SD card or 32GB USB flash drive.
6). Supports button control mode, RS232 and RS485 serial control mode.
7). In button control mode, playback of the ‘one-on-one' associated audio files are triggered by negative pulse
     to any of the 20 input terminals.
8). In button control mode, possible playback of 255 MP3/WAV audio files per 20 ‘one-on-one’ associated
     folders through negative trigger.
9). In button control mode, Four Selectable triggering modes are provided. 
10). Supports audio output to an external amplifier through the RCA audio jacks.
11). Separate volume control for each sound channel (only for on-board amplifier).
12). On-board relay used to control on/off to external equipment during playback.
13). Wide range for power input DC (12V - 24V).
14). Industry-grade design and strong anti-jamming capability.
15). PCB size: 135mm x 75 mm (5.315 Inches x 2.953 inches).
 
3. Technical Parameters
1). Power input: DC12-24V
2). Rated output: 15W×2 (RL= 8ohms d=1%)
3). Noise Voltage: ≤50mV
4). Frequency response: 20-20KHz
5). SNR: ≥ 90dB
 
4. Connections

K1 through K20 are representing Normally Open (N.O.) manual buttons. Please refer to the connection example below.
 
Notes:
 
1). There are two ‘GND’ connecting terminals for convenient connections on the both sides of the 20 input connection terminals for the buttons.
2). The volume potentiometer “VOL_R” associates with “SPK1” while the volume potentiometer “VOL_L” associates with “SPK2”.
3). The on-board amplifier shuts down automatically, when the on-board RCA audio jacks are connected to an external amplifier. 
4). The relay is triggered (activated) only during playback.