Single chip microcomputer STM32L151CCU6
Photocoupler
Bill of materials
P1 = 22K R1 = 18K R2 = 68K R3 = 68K R4 = 68K R5 = 18K R6 = 68K C1 = 4.7uF-25v C2 = 4.7uF-25v C3 = 22pF C4 = 220uF-25v C5 = 220uF-25v C6 = 4.7uF -25v C7 = 22pF C8 = 220uF-25v J1 = 3.5mm Stereo Jack B1 = 9V Alkaline Battery IC1 = NE5532-34 SW1 = SPST Toggle Switch
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