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BackTR-x2D(C)(T) modules, http://iqrf.org/weben/downloads.php?id=104 8 pin DIP socket | | L1 | 1 nF | Unpolarized capacitor | | | R14 | 1 | SW_3PDT_x3 | Switch, single pole double throw, separate symbols | | R25 | 1 | B10k | \*\*Potentiometer, 9 mm vertical board mount OR: | | | | U2 | 1 | TL074 | Quad operational amplifier, DIP-14"/>