Obsolete This calculator has been replaced by the Wire Wizard . It will not be developed further.
Let's say you want to make a twisted coil with Ni200 and Kanthal for temperature limited vaping.
Add wire on the Kanthal and the Ni200.
The table shows you the calculated resistance for each wire, at different temperatures. You'll notice that as you change the resistance of each wire, the calculated resistance values are updated.
The row "Total R by temperature" will tell you the total resistance of your coil, after you have connected the selected wires in parallel.
The row "normalized TFR curve" is normalized so that the factor at 70 °F is always 1. These values are used in the DNA 200 output.
You can click the "Download CSV file" button to get a file for your DNA 200. This does not work in Microsoft Internet Explorer, due to security limitations, but it does work in most other browsers. If you need to use MSIE, you will have to do the following workaround:
Under "Sensitivity", you'll se a number like for instance 81 %. This means that in the temperature range typical to vaping, the resistance change will be 81 % of that of the resistance change would have been for a pure Ni200 coil. (A Ni200 coil will always score 100%.) A higher number means that your temperature control will be more accurate.
It is theoretically possible to score higher than 100 %, but first you'll have to find a coil material with a higher TCR than Ni200.
How low you can go while maintaining reasonably accurate temperature control, depends on your 510 connection, your atomizer, your building skills, and more.
The default values don't normally need to be changed, but if you want to, you can. There is no particular limit to how many points you can use (but the DNA 200 will accept a maximum of 8 points). Click the °F to the right of the input field to change to °C.
If the calculator has a resistance factor by temperature table for a particular coil material, it uses that.
When the selected temperature points don't correspond to the data points that are stored with the coil material, the calculator approximates them using linear interpolation.
If no table is present for a material, the calculator uses the TCR to calculate the resistances.