[Amplifier] 2.5-inch tray speaker in the chassis

【principle】

    The input audio signal is amplified by the 8002 chip and then output from the speaker

[Component BOM list]

C1 Chip Capacitor (MLCC) / 1uF ±10% GRM31CR72A105KA01K  / 1206 No.: C909823

C2 Chip Capacitor (MLCC) / 390nF ±10% 100V NM1206B394K101CEGN  / 1206 No.: C840125

C3 optional plug-in capacitor, pitch 100mil/200mil (2.54mm/5.08mm)

R1 chip resistor / ±1% 20K SCR1206F20K  / 1206 No.: C3017037

R2, R3 chip capacitor (MLCC) / 1uF ±10% GRM31CR72A105KA01K  / 1206 No.: C909823

U1 audio power amplifier/8002B Discontinued 8002B  /SOP-8 No.: C329449

U2 speaker/speaker/speaker 50MM-H12.5 4Ω3W transparent FS50DS0430-H12.5  / - No.: C782092

【io】

J1 power supply, connected to the large D port (choose one from H1, both are 5V)

H1 power supply, connect the USB jumper in the chassis. After placing the PCB upright, the left side is positive and the right side is negative.

U2 speakers require 4Ω3W, ØMAX60mm, no positive and negative stages

【other】

Remember to get something like hot glue to secure the speakers.

【exhibit】