元件BOM表：

R1 = 2.2K
R2 = 3.3R
R3 = 10R
R4 = 4.7K
R5 = 33K
R6 = 100K
R7 = 100K
R8 = 220K
R9 = 330K
R10 = 500K
C1 = 10nf-63V
C2 = 10nf-63V
C3 = 100nF-63V
C4 = 100nF-63V
C5 = 100nF-63V
C6 = 100nF-63V
C7 = 100nF-63V
C8 = 220uF-35V
Q1 = 2N3819 FET
Q2 = BC337 NPN
Q3 = BC337 NPN
D1 = 5mm Red LED
D2 = 1N4148
D3 = 1N4148
D4 = 1N4148
D5 = 1N4148
D6 = 1N4148
D7 = 5mm Red LED
IC1 = 7555
IC2 = 7555
SW1 = DPDT Switch
BUT = Battery Under Test
P1 = SPST Pushbutton