AC Grid Frequency Meter
Monitor Mains Frequency and Voltage

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Component list
Component List
Resistors
R1,R12 = 1k5
R2,R4 = 47 Ω
R3 = 2k2
R5,R8,R9,R10 = 10 k
R6 = 3k3
R7 = 47 k
R11 = 10 k trimmer, multiturn
R13 = 10 k trimmer
Capacitors
C1,C4,C6,C7 = 100 nF
C2,C3,C5,C8 = 470 µF, 25 V radial
Semiconductors
D1,D2 = 1N4007
D3,D4,D5 = 1N4148
T1 = BC547
IC1 = 7805
IC2 = PIC16F1825
Miscellaneous
S1 = pushbutton NO
DIS1 = alphanumeric LCD 2 x 16 characters
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