ECHOLINK Board Rev C. Parts List 

Resistors                                                      

4-  470 Ohm-Yellow Violet Brown (R10, R11, R16, R17)

4-  10K- Brown Black Orange (R3, R5, R9, R19)                                                                  

2-  1K- Brown Black Red (R23, R24)                                   

3-  100K- Brown Black Yellow (R4, R6, R7)                   

1-  4.7K- Yellow Violet Red (R12)   

2-  100 Ohm- Brown Black Brown (R8, R13) 

Capacitors

7-  .1uf (C1, C2, C3, C4, C7, C8 C9)

1-  .001uf (C6)  

Diode

1N4148 (D3) 

Transistors

2-  2N2222 (Q1, Q2) 

Relay

1- 5V DPDT (K1) 

Resonator

1- 3.58 MHZ (Y2) 

IC’s

1-  PIC 16F628-04/P (U2)

1-  DTMF MT8870DE (U1) 

MISC.

1-  LM340T5 7805 (U3),          1- ECHOLINK Rev C. Board

4- LED’s (Red – Power D5 and Activity D4) (Yellow- PTT D9) (Green-DTMF D8)

3- Mono Audio Sockets (J1, J3, J5)

1- Stereo Audio Socket (J4)

1- Power Socket (J2)

2- 18 Pin IC Sockets

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DOCUMENTATION

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