{"schemaVersion":1,"slug":"iec-microphone-input","name":"Microphone input","kind":"symbol","abbreviation":"HAN1B9","aliases":["Microphone input symbol","HAN1B9","Microphone input IEC reference"],"category":"installation-communications","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A microphone indication identifies an acoustic-input transducer in a communications circuit.","description":["A microphone indication identifies an acoustic-input transducer in a communications circuit.","Reference the signal input, supply or bias arrangement where relevant.","A microphone converts sound into a signal; a loudspeaker performs the opposite role."],"readingNotes":["Reference the signal input, supply or bias arrangement where relevant.","A microphone converts sound into a signal; a loudspeaker performs the opposite role."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Reference the signal input, supply or bias arrangement where relevant.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"A microphone converts sound into a signal; a loudspeaker performs the opposite role.","facts":[{"label":"Reference scope","value":"Specific public IEC-context family form"},{"label":"Publisher reference token","value":"HAN1B9 (Autodesk token; not a verified IEC database ID)"},{"label":"Information added","value":"Reference the signal input, supply or bias arrangement where relevant."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"iec-public-annunciation","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}],"related":["power-converter","generic-electrical-load"],"artwork":"edu-iec-microphone-input","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Microphone input","reference":"Autodesk IEC-60617 Symbol Preview — Electroacoustic annunciation forms; vendor family reference, not certified IEC geometry or database identifier."},"url":"https://eloragrid.ai/symbols/iec-microphone-input","illustration":{"url":"https://eloragrid.ai/library/illustrations/iec-microphone-input.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"iec-public-annunciation","title":"Autodesk IEC-60617 preview: Electroacoustic annunciation forms","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-4602FA60-BECA-4C77-A435-73C8C05E41F7.htm","type":"cad-reference","scope":"Public publisher IEC-context family names and vendor block references. No vendor images or CAD library files are reproduced, and vendor tokens are not presented as verified IEC database identifiers.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}]}