Hobby Projects - Insulation tester, LED Circuits, Meters.

Friday, February 05, 2016

Metal Detector Projects

Here are some Metal Detector Projects that are quite interesting for the purpose of education and experiments in the Art of electronics. This site may be as old as Y2K, but the url / domain may have changed.

Metal Detector Projects

If you are interested in the theory behind the mag I can highly recommend the book The Magnetics Measurement Handbook by J.M. Janicke. Besides a good coverage of magnetics theory, it contains much of what you need to build a useful fluxgate Magnetometer, plus other devices.

Traditional Geophysical instruments include ground-penetrating radar, earth resistivity meter, infrared, and sonar, to name a few. Currently, earth resistivity projects are the most practical for the do-it-yourselfer, although some people have been tinkering with side scan sonar.

Metal Detector Projects

Detection of Gold

Just the Jeohunter really works and directly detects Gold - see below screen. And even gold-worth 9-15cm diameter cannon-balls get detected as "Gold" (golden ring & cannonball analyses has identical values), but thats because of the huge metal mass and special shape - alot MDs have "problems" in such situation and perhaps only a magnetometer really works here. btw. there is no difference if you search with Ground Balance minus 200, zero or plus 200, the gold detection always remains the same.

Detection of Gold - Metal Detection

There are historical records of DIY Enthusiasts having created what is known as the "Donkey Kong Gold Hunter". This Gold Detector uses a Nintendo Unit after many Mods.

Thursday, February 04, 2016

Telegraph Key and Sounder

Get the Plan Drawings and Make your own Morse Key with a Sounder from J.E. Howell Model Engine Plans.

"The full size plans will allow you to make an exact replica of the key and sounder. The photo above is the "real thing" antique originals. The originals were made in a time when quality was of prime importance and esthetics ran a close second! These instruments were made of brass and steel,"

Western Electric Telegraph Key & Sounder

Telegraph Key and Sounder

--. .-. . . - .. -. --. ... / ..-. .-. --- -- / -.. . .-.. .- -... ...

Use Morse Code Translator to Unravel the Telegraphic Morse Message above.

Wednesday, February 03, 2016

Bill and Mark Sherman Make Robots

From Joule Thief Artbots to Picaxe Projects. Bill and Mark Sherman are Making Things that Move.

Some are Mood Beam Autopsy Make an artbot out of a Mood Beam toy. FireFly Project Make a "Jar of Fireflies" using a Picaxe Microcontroller.

Bill and Mark Sherman Make Robots - wayback copy

A two wheeled robot using foam and CDs for the wheels. Shown above is the Front View, Heat Sensor, IR avoidance module and Beeper. More projects are at The Botsmaker Blog.

Bill and Mark Sherman Make Robots

16F88 3-digit voltmeter

"I wanted to make a simple 3 digit voltmeter for mounting inside a power supply for troubleshooting purposes. Scouting around the internet, I couldn't find anything complete enough to make a meter. So I decided to make my own using Pic Pro basic to program a 16F88 PIC."