Resistor Substitution Box

Introduction: Resistor Substitution Box

About: I love making things. I always found electronics and stuff like that fun. When I was little I always took apart my toys and put them back together. I thank God for giving me my gift of my creativity and know...

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!

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Be the First to Share

    Recommendations

    • LED Strip Speed Challenge

      LED Strip Speed Challenge
    • Sculpting Challenge

      Sculpting Challenge
    • Clocks Contest

      Clocks Contest

    6 Discussions

    0
    im3733
    im3733

    8 years ago on Introduction

    FYI, a quick google search provided 10-Turn 1K ohm pots for ~$5-$10. Granted, that may be more than most would like to put into something like this (especially for just a single pot), but considering how much time and effort this can save, it might be worth the investment.

    Here's a link to one that I found:
    http://gb.suntekstore.com/WXD3__13-Multi__turn-Wirewound-Potentiometer.html?&utm_source=gbus&utm_campaign=gbus
    (this one's actually ~$2.50 USD, but 5-10 semed to be the average)

    0
    Robot Lover
    Robot Lover

    Reply 8 years ago on Introduction

    Hey, thanks for the link! I probably would have found it if I had searched, but the main reason I didn't use one is that the store I bought my parts from did not have a 10 turn pot. I didn't wanna have to buy parts from multiple online stores, so I just improvised. Thanks again!

    0
    Robot Lover
    Robot Lover

    Reply 8 years ago on Introduction

    In electronics, resistors are one of the most important components. But often times you don't know the value you need. So this will emulate a resistor, when you turn the knobs the resistance changes. So it's basically like switching out resistors much faster.