---
title: How Do Magnetic Encoders Produce a Signal?
description: Magnetic encoders use a permanent magnet and a Hall effect to produce a change in either voltage or electrical resistance.
---

<https://www.dynapar.com/faq>

# [How Do Magnetic Encoders Produce a Signal?](https://www.dynapar.com/faq/how-do-magnetic-encoders-produce-a-signal)

 Written by [London Rhodes](https://www.dynapar.com/faq/author/london-rhodes) | Sep 29, 2021 6:58:27 PM

Magnetic encoders use a permanent magnet and a Hall Effect, or magnet resistive device, to produce a change in voltage or electrical resistance in the presence of ferromagnetic material. This change will occur in the form of a gear tooth (in a rotary encoder) or a metal band with slots (in a linear encoder). Tis type of sensor will work down to zero speed, and is available in both rotary and linear forms. 

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