Introduction: Resistor Substitution Box
A few weeks ago I saw a circuit in Make: Volume 23 for a resistor substitution box. It looked like it could come in handy so I decided to have a go at it. It called for: an SPST switch for switching the ohms from infinite, a 1mohm potentiometer,100k potentiometer, a 10k potentiometer, 1k potentiometer and a 1k 10 turn potentiometer. First off I would like to say that I did not have the money for the 10 turn pot and likely won't. I subbed it for a regular 1k pot. This has a downfall though, It is not as accurate. I also did not get the 100k pot or the switch. Even with these substitutions, I still has a range of 13 ohms to one megohm. Pretty shnazzy! I bought all my parts here: tayda electronics, EXTREMELY cheap. Here's some pics of mine, I managed to cram it in a tic tac container!
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