Part 1 of this article, published in the last issue of MEW, covered the general design philosophy, and gave the circuit diagram and detailed masters for PCB manufacture. We now proceed to look at etching the PCB's and constructing the device. Those of you that are familiar with the use of UV equipment for PCB production, and have boards coated with UV sensitive resist, can probably skip the following description. However, as the equipment needed for this is expensive for making a one-off board, I decided to try a technique (also described by Chris Fouweather in MEW Issue 100) that I had heard of, but hadn't used before, which makes use of the properties of the toner used in laser printers and photocopiers (NOT ones based on inkjet technology though!) to create a usable resist for etching.
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