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Pair of PIC12F617-I/P chips for the Steam Train Whistle/Diesel Horn [0910618A/M.HEX] A pack of two PIC12F617-I/P 8-bit microcontrollers programmed with the firmware for the Steam Train Whistle/Diesel Horn (0910618A.HEX and 0910618M.HEX). This includes the chip to produce white noise for the steam sound, plus the chip that produces the whistle/horn sounds. You don't need to purchase the two chips separately if you buy this bundle. Also make sure to order the TDA7052AT audio amplifier IC if you need one for this project. Cat No SC4696. Price: AUD $15.00 1  Add to trolley In stock: yes (39 available). Estimated dispatch time: 3-10 days Related to: Project: Steam loco or diesel engine sound effects module (September 2018 [print issue] [online issue]) Other items relevant to this project: Steam Train Whistle / Diesel Horn PCB [09106181] ($5.00) Add to trolley PIC12F617-I/P programmed for the White Noise Generator [0910618A.HEX] ($10.00) Add to trolley PIC12F617-I/P programmed for the Steam Train Whistle/Diesel Horn [0910618M.HEX] ($10.00) Add to trolley TDA7052AT 1.1W audio amplifier IC (SOIC-8) ($3.00) Add to trolley Firmware (ASM and HEX) files for the White Noise Source and Steam Train Whistle/Diesel Horn [0910618A/M.HEX] (Free) Add to trolley