Author Archives: graemek99

DIY fluxgate magnetometer for experimenters

I don’t think I’ve ever made anything with such an impressive-sounding name before. Doesn’t it sound like something out of a sci-fi movie? I didn’t make this as a project for my students – it’s a bit advanced. Rather I … Continue reading

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Simplest Seismometer – Experiments with direct recording through PC sound card

In this post I am not talking about the chopped audio method used in all my previous devices. This one is just straight audio – directly into the PC’s sound card. Some time ago I had bought into the idea … Continue reading

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Summer 2012

Several classes were run this summer. A few projects were repeated for the new, mostly younger students, while some of our older students made the pendulum seismometer described in this previous post. This is quite an advanced project. While we did spend … Continue reading

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Simple AM and Short Wave Radio Projects for Beginners

AM radio with spiral-wound coil and home-made tuning capacitor The radios described here are a regenerative design utilizing a single JFET and cheap audio amplifier integrated circuit. (JFET: “Junction Field Effect Transistor”, a small electronic device which can amplify radio … Continue reading

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Cheap seismometer using sound card and Amaseis – now running under Windows

After about a year and a half of messing around, I finally got this very cheap seismometer system working under Windows. It also displays data in real time – something I have still not accomplished with Linux. Educationally, it has … Continue reading

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BFO Metal Detector – Student Project

(* BFO: “Beat Frequency Oscillator” a technical term describing the most common operating method used by metal detectors.) Here are the technical details of the metal detector our students made during the winter vacation. Continue reading at Kids’ Resource Center……

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Winter 2012 Handcraft Classes

A great activity that will get kids out of the house during vacations (and away from computer games) is hunting for “treasure” with a metal detector. This winter, after some R&D work I finally worked out a design that would … Continue reading

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Home Made Speaker Experiment

Here is an easy way to demonstrate how sound is reproduced electronically. This is how a speaker works:

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Computer Game Addiction

By Graeme Keon The father’s sentence was abruptly cut off by the boy’s, “Well I don’t care! OK?!!!” shouted in a kind of sulky, “Look what you’ve done to me” tone of voice, then the “BAM!” of the slamming door. … Continue reading

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Summer 2011

Several classes were run this summer. Once again we found it very difficult to get the students to go home at the end of the two and a half hour course periods. It seems they just can’t get enough of … Continue reading

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