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ISD1820-based voice recording and playback module This small module can record and play back up to 10 seconds of audio by default, although this can be changed by varying the value of one resistor. See the article on the Junk Mail Repeller in the August 2019 issue for more details. Also used in the July 2021 Model Railway Level Crossing project. Cat No SC5081. Price: AUD $7.50 1  Add to trolley In stock: yes (16 available). Estimated dispatch time: 1-3 days Related to: Project: “HEY! THE SIGN SAYS NO JUNK MAIL!” (August 2019 [print issue] [online issue]) Project: Model Railway Level Crossing (July 2021 [print issue] [online issue]) Project: Automatic Train Controller (October 2022 [print issue] [online issue]) View 11 other items relevant to the same project(s)