---
title: "AN-7 Power Line Frequency by Country (hum)"
description: "This is a chart of power line frequencies and voltages by country. The following table may be found useful as aid in authenticating the country of origin of a particular audio recording.  [Click here to view the PDF](https://www.diamondcut.com/AppNotes/PowerLineFreq.htm)"
url: "https://diamondcut.com/docs/an7-power-line-frequency-by-country-hum/"
updated: "2022-01-31"
category: Application Notes
---

# AN-7 Power Line Frequency by Country (hum)

This is a chart of power line frequencies and voltages by country. The following table may be found useful as aid in authenticating the country of origin of a particular audio recording. 

[Click here to view the PDF](https://www.diamondcut.com/AppNotes/PowerLineFreq.htm)