Phone to sound card circuit schematic diagram.

Pads 1, 2 & 3 are the left & right audio inputs & ground connection.
Pads 4 & 5 are the audio output & ground connections.
Pads 6 & 7 are the telephone jack connections.
Pads 8, 9 & 10 are the power supply connections.


Phone to Sound Card Parts List

C1, thru C4 - 100uf Electrolytic Capacitor
C5 -   .001uf Ceramic Capacitor
C6 - .033uf Capacitor
C7 - .01uf
C8 - 4.7uf

IC1, IC2 - NE5532

R1, R2 - 10K
R3 - 100K
R4 - 1K
R5 - 2.2K
R6, R7 - 22K
R8 - 10K
R9 - 470
R10 - 910   1/2 watt
R11 - 1K     1/2 watt
R12 - 10K   Trimmer or Potentiometer

T1 - Midcom  671 - 8005

Phone jack RJ11
Microphone plug 3.5mm & cable
Stereo audio plug 3.5mm & cable
Note:
R10 and R11 are 1/2 watt resistors connected in parallel to dissipate heat and to achieve about 480 ohms to provide the current flow needed for a conventional landline telephone to operate.


Phone to sound card interface component layout.

Circuit Board Component layout.


Phone to sound card circuit board layout.

Viewing traces thru top of the circuit board.



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