An Explanation of Direct And Inverse Proportion

Introduction

At least one of my other posts How Distance Reduces The Power of Radio Waves (not yet published) requires an understanding of mathematical proportionality. In particular it requires an understanding of Inverse Proportion. So I have written this article to try and clarify it. It gives an explanation of the two types of proportion, otherwise known as variation, which are:

  1. Direct Proportion,
  2. Inverse Proportion otherwise known as Indirect Proportion.
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Extending The Door Bell In My Home

Post Description

How I extended the door bell in my home so it can be heard in the house extension and shed. It’s been done by incorporating wireless technology, while retaining my original 1980s “DING-DONG” door chime which had a great sound and an illuminated bell push.

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Lubricating The Heat Sink Fan On A GeForce GTS240

Preface

This post describes: How the cooling fan on an NVIDIA GeForce GTS240 PC display adapter was lubricated to silence it when it became noisy.

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Is My Dualit Model DMF2 Milk Frother Corroding?

Introduction

Unfortunately besides my Dualit Milk Frother requiring a repair (see How I Repaired A Dualit Milk Frother Model DMF2) another problem has developed. I have to ask, “Is my Dualit Milk Frother corroding?” If not what is happening to it. Is the brown mark I can see copper or rust?

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How I Repaired A Dualit Milk Frother Model DMF2

Introduction

My wife pressed the start button on the Dualit Milk Frother (Model DMF2) one day in the summer of 2017 and it no longer worked. This persisted so we had to heat the milk in the microwave oven for a week or two until we got a new frother.

Of course, me being me, I dismantled the faulty Dualit Milk Frother to see if there was an obvious problem. There wasn’t anything burnt out or blackened. Just a lot of wiring in a very confined space. It was constructed with a flat straight circuit board fitted into a curved space. No-one had used flexible circuit boards here.

The long term solution was to replace the whole Dualit Milk Frother. Since they are still on the market that’s what I chose to do. The faulty one had been a replacement for our Nespresso Aeroccino Milk Frother already mentioned in this blog. We now had to replace the replacement.

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UK 13 Amp Plug and Mains Extension Cable Safety Issues

Introduction

The initial purpose of this post is to raise awareness of a UK 13 Amp Mains Extension Cable Safety Issue. I came across it by chance when I landed on the PlugSafe site. I’ve taken the liberty of reproducing their information below and enhancing their picture. Full credit to PlugSafe for making us all aware.

As a consequence of a comment on the initial post I have also included an issue with the safety of 13 Amp Mains Plugs too.

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Condensation Free Bathroom Mirror

Introduction

This post describes how to make a condensation free bathroom mirror using an automatic mirror heater. See the one I made in 2007 here. Look carefully and you will notice the condensation around the edge but not in the central heated area.

Without a heater it would be impossible to use the mirror without first wiping it with a towel. Cold mirrors usually mist over again after wiping.

With an active mirror heater it’s possible to get straight out of a bath or shower and use the mirror immediately.

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Lighting Charts – Which Lamp Do I Need?

Introduction

We are all trying to reduce energy costs and CO2 emissions by choosing modern alternatives to incandescent lamps. Here are some lighting charts to help you select the best lamp for your situation. Since the decline of incandescent lamps there have been many alternatives made available based on fluorescent tubes bent in many ways to condense a long tube into a confined space.

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Bionic Prosthetic Hand For The 21st Century

Introduction

prosthetic hand

I listened to the BBC Radio 2 Jeremy Vine show on 23rd June and heard a great article about a young woman who had been given a bionic prosthetic hand. A 21st century creation. Her name is Nicky Ashwell and here she is in the following video tweet being interviewed by Jeremy Vine who went on to receive this handshake.

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