Decade resistor box


Posted on Mar 29, 2013

This device was designed to use two generic-patterned, pre-made, pre-drilled circuit boards that are available from Radio Shack, and other places. Parts consist of: two generic pre-etched and pre-drilled PCBs (printed circuit boards), 136 precision 1%, 1/2-Watt metal-film resistors (46 values), seven 1P10T rotary switches, seven knobs, two binding posts, wire, solder, drilled cast-aluminum or plastic case (7.5`x4.3`x2.4`), panel markings, and rubber feet.


Decade resistor box
Click here to download the full size of the above Circuit.

Parts list: (1) Circuit Board, 5 holes connected x 47 rows x 2 columns (Radio Shack 276-170) (1) Circuit Board, 3 holes connected x 25 rows x 2 columns (Radio Shack 276-150) (7) 1P10T Rotary Switches (Mouser 10YQ110 or other) (7) Knobs (Jameco 136240, or other) (2) Binding Posts (Jameco 77690 or other) (1) Case, 7.5" x 4.3" x 2.4" aluminum or plastic (Jameco 11973 or 18905, or other) (1) Wire, #22 (1) Solder (4) Rubber Feet, Adhesive (Jameco 119618, or other) (136) Resistors, 46 different values, 1%, 1/2-Watt, metal film (www.radioshack.com @ $0.05 ea): (25) 10 ohm (3) 15 ohm (1) 24 ohm (7) 39 ohm (1) 91 ohm (1 ea) 100 ohm, 1K, 10K, 100K (4 ea) 20 ohm, 200, 2K, 20K, 200K (4 ea) 30 ohm, 300, 3K, 30K, 300K (1 ea) 27 ohm, 270, 2.7K, 27K, 270K (1 ea) 18 ohm, 180, 1.8K, 18K, 180K (2 ea) 43 ohm, 430, 4.3K, 43K, 430K (1 ea) 47 ohm, 470, 4.7K, 47K, 470K (1 ea) 62 ohm, 620, 6.2K, 62K, 620K (5) 1 Megohm (20) 2 Megohm For the panel markings, you can create them in a Paint-type program, and print them onto clear (or other) peel-and-stick labels.




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