PLF-15 Parts List:

NOTE: On boards dated 3-2024 or after, some components have a different part designation.
These newer part numbers are shown below in brackets [ ].
Lettered capacitors were converted to C(number).
Lettered resistors are simply a single number in a square box.


350 Hz High Pass Filter configuration - Stand alone CTCSS Filter:

PLF-15 printed circuit board
U1 - TL062BCP - High-Performance J-FET Input Operational Amplifier
4 pin header socket or pins.
8 pin gold-plated machine IC socket.  Align the notch to match the silkscreen.
C1 - NOT Assigned on boards dated before 3-2024.
C1 on newer boards - see "G" below.
C2 - 1uF (105)
C3 - 220uF 16v electrolytic (observe polarity) (see notes below on installation)
C4 - 1uF (105)
R1 - 1k - 1/4 w - 5% (brown - black - red - gold)
R2 - 1k - 1/4 w - 5% (brown - black - red - gold)
A [3]  - 8.2k - 5% (gray - red - red - gold)
B [4]  - 2.2k - 5% (red - red - red - gold)
C [C7] - 0.1uF (104)
D [C8] - 0.1uF (104)
E [5]  - 5.6k - 5% (green - blue - red - gold)
F [6]  - 39k - 5% (orange - white - orange - gold)
G [C1] - 0.068uF (683 or 0.068) (red)
H [C5] - 0.068uF (683 or 0.068) (red)
I [C6] - 0.068uF (683 or 0.068) (red)
J [7]  - 2.2k - 5% (red - red - red - gold)


All components mount flush against the printed circuit board by bending the 
leads close to the body of the part.

C3 is installed making sure you place the positive lead into the square hole and the 
minus or negatve lead into the round hole.  The capacitor has a band that plainly 
marks the negative (minus) lead.  The board has a + sign silkscreened to show the 
placement of the positive lead and the capacitors proper orientation.

Installation of the IC socket is optional - but recommended.

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