The Dreaded Ohms Law

In a previous article we looked at the power formula, and discussed the relationship between power, voltage and current. Having looked at the power...
HDMI connector

Video Signals & Cables: HDMI

In this article, we look at HDMI: what it is, where it is used, and what cables are used for HDMI. This is the...

Double amplifier power does not double the volume

This article logically shows the relationship between amplifier power, SPL and loudness. It includes a level difference exercise and a gain calculator.

Understanding Speaker Impedance

Speaker impedance is often presented as a complex subject and therefore is either ignored or misunderstood. A basic understanding of speaker impedance is not...

Speaker Selector Switch Simulators

The speaker selector switch simulators presented here demonstrate how speaker selectors deal with speaker impedance and power distribution. Speaker selector switches are used to...

Video Signals & Cables: Summary

This is the summary of the previous five articles looking at the different video signals and connectors commonly used in Home AV. Previously we...

Understanding Audio Frequency

Every sound we hear is at a certain frequency. When we say someone has a deep voice, we are describing a voice producing low...
RGB video VGA plug

Video Signals & Cables: RGB video

In this article we look at RGB video signal: what it is, where it is used, what cables to use and the problems with...

Decibel Calculator for Audio (voltage)

If you don't like formulas then you definitely won't like the formula for calculating voltage ratios expressed in decibels.So, use the following calculators to...

Reflections on the TV Remote Control

The recent passing of Eugene Polley, the man known for inventing the remote control, has given me cause to reflect on the development of...