# Microphone input

Canonical URL: https://eloragrid.ai/symbols/iec-microphone-input
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: HAN1B9
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Microphone input
Autodesk IEC-60617 Symbol Preview — Electroacoustic annunciation forms; vendor family reference, not certified IEC geometry or database identifier.

A microphone indication identifies an acoustic-input transducer in a communications circuit.

## What it represents

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.

## 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

- Reference scope: Specific public IEC-context family form
- Publisher reference token: HAN1B9 (Autodesk token; not a verified IEC database ID)
- 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

## Public references

- [Autodesk IEC-60617 preview: Electroacoustic annunciation forms](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-4602FA60-BECA-4C77-A435-73C8C05E41F7.htm) — Autodesk. Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.

## 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.