Num="1" name="E" type="passive"/> Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | Screws, nuts, and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see build notes) 1 SIP socket, 2.54 mm, 1x4 Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92Quad operational amplifier, DIP-14