Decade Resistor Box
Description
Decade Variable Resistor 0 - 10Mohm* In Increments Of 1Ohm With A Laser Cut Enclosure Using Moderately Cheap And Easily Sourceable Components. Total Cost For The Parts Orders Looks To Be Just Under $40 Plus Acrylic ($10 For A 24"X18" At Lowe'S), But This Doesn'T Take Into Account The Fact That, E.G, While You Are Ordering 100 Bolts, You Are Only Using 12. Real Cost Is Probably Closer To $15. The Soldering Is Rather Tightly Packed, So Proceed At Your Own Risk. A Word Of Warning: I Designed This Mostly For Myself, So Don'T Assume That Everything Will Be Perfect. I May Also Refine A Couple Things In The Coming Weeks. 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. If You Just Want A Decade Resistor Instead Of Taking The Time To Do It This Way, Sparkfun [Has A Kit](Https://Www.Sparkfun.Com/Products/13006) For $30 That'Ll Go From 0-1M With 10Ohm Increments. I Like Mine Better. *Yes, I'M Lying To You. It Actually Only Goes Up To 9,999,999 Ohms.
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