Here's a good video on Building a Resistor Substitution Decade Box. He starts with showing the insides of a High End Seven Decade Programmable Resistor Box. And then goes on to Build his own...
Don
Video Link...
http://www.youtube.com/watch?v=6R4XLTJ-p5w
Don
Video Link...
http://www.youtube.com/watch?v=6R4XLTJ-p5w
- Building a Resistor Substitution Decade Box
- Seven Decade Programmable Resistor
- Seven Decade Programmable Resistor – A Low Cost Solution | gerrysweeney.com
- Building a resistor substitution decade box
- Seven Decade Programmable Resistor - A Low Cost Solution - YouTube