Very clear pictures of the project details. Look in Projects or Link_dump on filing resistors for accuracy.

Post : Building a resistor substitution decade box
URL : http://hackaday.com/2012/08/21/building-a-resistor-substitution-decade-box/
Posted : August 21, 2012 at 11:30 am
Author : Mike Szczys
Tags : decade, substitution, switches, thumbwheel
Categories : news

http://hackadaycom.files.wordpress.com/2012/08/resistor-substitution-decade-box-e1345563851194.jpg

[George] built an incredibly tidy resistor substitution decade box (http://www.digitalunderpants.com/?p=219) . These devices feature a pair of connections and a way to select the resistance between the two of them. In [George's] case it's a pair of banana jacks and these eight thumbwheel switches.

What you see above is the side of each thumbwheel switch. These are panel mount devices which show one digit with an up and down button to change the setting. As you can see, the PCB for each provides connections to which a set of resistors can be mounted. This is the difficult part which he goes to great lengths to explain.

At this point he's got the resistor groups for each digit soldered in place, the next step is to stack the switches next to each other and connect them electrically. From there it's off to a project box in which they will be mounted.

This project does a great job of explaining the assembly process. If you're interested in the theory behind a substitution box check out this other project (http://hackaday.com/2011/07/22/resistor-substitution-box/) .

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