DIY electronics projects
In the last years I have developed many small but usefull electronic devices. Often these devices were used for
interfacing specific sensors or equipment to computers. Many of these projects are useful for a wider public, and
therefore I have decided to make these projects available on the internet. Every project contains a description on
the functionality and schematics. You can either build the print yourself, or order a print of these projects
at me. For most of the projects I have double sided prints available for nominal costs.
DSP based pulse induction metal detector. This project started
because of a problem when renovating
our house. It took us three days digging to find the connection of our water line to the central water system in our
village. A deep seeking metal detector would have found the location in probably five minutes.
Pulse induction metal detectors send a short magnetic pulse into the ground. This magnetic pulse starts eddy currents
in metals which can be detected until about 100 microseconds after the magnetic field has been switched off. This
design used a digital signal processor which reduces the number of components on the print, and increases the
flexibility, including the possibility to discriminate between various metals which is very difficult with common
pulse induction metal detector designs.
If there is a possibility of several things going wrong,
the one that will cause the most damage will be the one to go wrong.
MURPHY'S THIRD COROLLARY