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Firmware and BASIC source code for the 0-110dB RF Attenuator [Attenuator 3] The ATmega328 microcontroller firmware (HEX file) plus BASIC source code for the 0-110dB RF Attenuator. If programming the chip with the HEX file yourself, make sure you read the README.TXT file and follow the instructions regarding 'fuse' bits programming. Cat No SC0022. Price: Free Files: Attenuator 3.zip (ZIP contains .hex and .bas files; 15.1KB) Related to: Project: 0-110dB RF Attenuator (July 2022 [print issue] [online issue]) Other items relevant to this project: 0-110dB RF Attenuator PCB [CSE211003] ($5.00) Add to trolley ATmega328P programmed with the firmware for the 110dB RF Attenuator [CSE211003.HEX] ($10.00) Add to trolley Pulse-type rotary encoder with pushbutton and 18t spline shaft ($3.00) Add to trolley 0.96in cyan OLED with SSD1306 controller ($10.00) Add to trolley Short-form kit for the 0-110dB RF Attenuator ($75.00) Add to trolley 0-110dB RF Attenuator PCB pattern (PDF download) [CSE211003A] (Free) Add to trolley Front panel label and drilling diagram for the 110dB RF Attenuator (Free) Add to trolley