Category: Science & Technology

Any scientific subject – physics, biology or chemistry.

Microwave Inverter Repairs To The Door Button & Bezel

Introduction

A few months ago my eleven year old Panasonic 1000 Watt Slimline Combi Microwave Inverter (Model: NN-A574SBBTQ) developed a problem which was only visual. The large rectangular button used to open the door began protruding on the right end by about five millimetres. Operation of the machine wasn’t impaired but continuous use with the faulty button led to further problems when the button jammed and I couldn’t easily open the door. In the end I had to make microwave inverter repairs to the door opening button and to the door bezel when it later came adrift.

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Radio Wave Power And How It Gets Reduced By Distance

Introduction

Some people are very concerned that radio wave power coming from radio transmitters’ antennas will harm people. In particular people are troubled by mobile phone masts causing long term health problems when they are near to their homes.

I just want to make it clear how much a transmitter’s power diminishes as it spreads out from a transmitter. I’m sure some feel it must follow a simple linear law such as:

  • double the distance and get half the power,
  • triple the distance and get a third of the power,
  • quadruple the distance and get a quarter of the power.

When in fact it follows an inverse square law which is nonlinear and gives this type of result:

  • double the distance and get a quarter of the power,
  • triple the distance and get a ninth of the power,
  • quadruple the distance and get a sixteenth of the power.

This means the power (and damaging energy) is much lower than might be expected at any particular distance. Even within a short distance the power can drop considerably.

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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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Cooling Fan Lubrication For An NVIDIA GeForce GTS240

Preface

This post describes: My success at cooling fan lubrication on an NVIDIA GeForce GTS240 PC display adapter 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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