I'm undertaking a DIY rope cutter project to avoid paying for the ~$150 store bought ones.
Many resources online told me to use a light dimmer + transformer configuration and I had planned to go a step further and build the dimmer too, using the circuit from this site: (replacing the light with a transformer)
However, upon reading a few posts here it has been suggested that dimmer circuits don't mix well with inductive loads such as transformers so I'm looking for alternatives.
I played around with a current division circuit using parallel resistors and a variable resistor however the high power would fry the resistors by a long shot.
Unfortunately this is where my education draws a blank and I open it up to any suggestions from those more educated than myself.
On a final note, please don't suggest using a bench power supply as this is not financially viable at this point in time, also needs to run off 240VAC (Australia.)
Blade arrived in the post today, it is advertised as a 60W but I would like to test it.
I also bit the bullet and grabbed a benchtop power supply, 0-30V 0-20A.
I thought I could find the current-voltage combination by connecting the blade across the supplies terminals however when I do so the voltage refuses to climb above 0.6V (pushing current up to 20A)
Using P=VI this means I can't get the power above 12W, much lower than the ~60W needed to heat the blade.
I'm inexperienced with benchtop supplies, is this normal? Are there any workarounds?