# ANSI/IEEE Microphone input form Canonical URL: https://eloragrid.ai/symbols/ansi-microphone-input Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HAN1B9 Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Microphone Autodesk IEEE Symbol Preview: Annunciations, block HAN1B9. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Microphone input](https://eloragrid.ai/symbols/iec-microphone-input) IEEE-library form of microphone input: a microphone indication identifies an acoustic-input transducer in a communications circuit. ## In plain English ### What does ANSI/IEEE Microphone input form mean? This reference locates microphone input in Autodesk's IEEE-oriented annunciations family. A microphone indication identifies an acoustic-input device that turns a measured quantity into a signal in a communications circuit. The public library uses HAN1B9 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. ### A simple example Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits. ### What the drawings help you do Reference the signal input, supply or bias arrangement where relevant. A microphone converts sound into a signal; a loudspeaker performs the opposite role. Reference the signal input, supply or bias arrangement where relevant. A microphone converts sound into a signal; a loudspeaker performs the opposite role. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ### This particular reference IEEE-library form of microphone input: a microphone indication identifies an acoustic-input device that turns a measured quantity into a signal in a communications circuit. A microphone converts sound into a signal; a loudspeaker performs the opposite role. ### Terms - Terminal: An identified point where a conductor connects. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. - Rating: A value stating the conditions for which equipment is specified. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview: Annunciations](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-157265BC-DB2C-4AFE-B9E9-88A5F748BFF9.htm) ## What it represents This reference locates microphone input in Autodesk's IEEE-oriented annunciations family. A microphone indication identifies an acoustic-input transducer in a communications circuit. The public library uses HAN1B9 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits. Reference the signal input, supply or bias arrangement where relevant. A microphone converts sound into a signal; a loudspeaker performs the opposite role. Reference the signal input, supply or bias arrangement where relevant. A microphone converts sound into a signal; a loudspeaker performs the opposite role. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ## How to read it - Reference the signal input, supply or bias arrangement where relevant. - A microphone converts sound into a signal; a loudspeaker performs the opposite role. ## Information to show or reference - 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. ## Important distinction A microphone converts sound into a signal; a loudspeaker performs the opposite role. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Annunciations; published form: Microphone. - Public vendor block: HAN1B9. Vendor library token, not an IEEE symbol number. - Information added: Reference the signal input, supply or bias arrangement where relevant. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview: Annunciations](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-157265BC-DB2C-4AFE-B9E9-88A5F748BFF9.htm) — Autodesk. Public IEEE-oriented Annunciations table explicitly lists HAN1B9 as Microphone. This supports the vendor convention context, not reproduction of the publisher graphic. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.