A resistor decade
box in pots
A ‘decade box’ is a simple instrument for easily changing values of components during prototyping. ResPot is a fancy resistor decade box where values are set manually using a wire.
Assembly and usage
The project comes with the following components:
x10 1Ω, Multicomp MF25 1R
x10 10Ω, Multicomp MF25 10R
x10 100Ω, Multicomp MF25 100R
x10 1KΩ, Multicomp MF25 1K
x10 10KΩ, Multicomp MF25 10K
x10 100KΩ, Multicomp MF25 100K
x5 header, Valcon EB07-1x12-AG1-G
x5 Lovely PCBs
As you can see we supplied five PCBs and six different resistor values. Depending on which range you decide to use, you can get 1-99,999Ω or 10-999,990Ω.
You actually only need nine resistors per PCB, so there’s one spare. Enjoy. On the ‘copper’ side of the board you can see how the circuit board and holes are connected. Use that to determine how you’d like to connect the LEDs. You can choose to have either side be the ‘front’.
The value of the resistors we supplied you are accurate to 1% of the ‘ideal’ value. That error will either stack up cancel out depending on the direction of the error. This deviation from the ideal value is noticeable particularly in the higher values, of course, but ‘parasitic’ resistance (from the wires mostly) are more noticeable at the lower values.
ResPot is an open source design, as is most of our work. You can find the design files for the hardware and packaging at our GitHub repository. You can edit the design files using our own PCB design open source software, PCBmodE.
The PCBs were lovingly made by Eurocircuits.
Community contributions for this project are on our community site.