DTMF Decoder v3 by IK3SVW
Component list 

C1...C5   0.1uF
C6-C7     27pF
C8        22pF (option, see manual)
C9        1uF
IC1       PIC16F876A
IC2       MT8870D
IC3       78L05
LED1      Yellow
Q1-Q2     3.579545Mhz XTAL
R1-R2-R4  100K
R3        680
R5        1K2
R6        4K7
R7-R8     10K
R9        15K
R10       220K
R11       220 Trimmer
R12-R13   10K Trimmer
R14       470
R15...R18 4K7
R19       560
T1...T4   BC547
T5        2N2222A
LCD       LCD 2x16     (optional)
P1	  Push button N.O.(optional)
AP        Loudspeaker 8 Ohm (optional)
