Decade Resistor Box
Description
Decade Variable Resistor 0 - 9,9Mohm* In Increments Of 1Ohm With A 3D Printed Enclosure Using Moderately Cheap And Easily Sourceable Components. Total Cost For The Parts Orders Looks To Be Just Under 20€ The Soldering Is Rather Tightly Packed, So Proceed At Your Own Risk. A Note About Resistor Tolerances: I'M Using 1% Resistors. I Wanted Something Better Than The Really Cheap And Common 5% Resistors, But Much Better Than 1% Costs Too Much. Also, The Switches Themselves Add Resistance And Some Variance. The Tolerances Don'T Add Like Some People Worry For Setups Like This - Any Resistance I Can Dial In Will Be Within 1% Of The Number On The Switches - In Theory. The Switches Add A Couple Ohms (1.5Ish) To The Box Overall, So The Low Values Will Be More Imperfect Than The High Values. Also, It'S Best Practice That Once You Tune A Circuit With A Box Like This, You Remove The Box Then Measure The Resistance Instead Of Relying On The Readout.
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