22p

1

C5

30p

1

C6

180p

1

C4

100n

5

C1 C2 C3 C7 C8

1N914

2

D1 D2

AADE

1

DSP1

430

1

R2

1k

1

R1 R5

4k7

1

R8

10k

1

R7

100k

3

R3 R4 R6

DPDT

2

S1 S2

74HC4046

1

U2

PIC16C71

1

U1

10 XTAL

1

X1