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Schematic of General Purpose Alarm Device
+5V
VBus
Vin
ControllerVcc
SPI_SCK
R3
Resistance
330R Ω
LED1
R2
Resistance
DNI Ω
R1
Resistance
DNI Ω
J2
D2
C2
Capacitance
100nF
CP2
Capacitance
47uF
C3
Capacitance
100nF
TP103
U4

General Purpose Alarm Device