I was slightly concerned about the contact resistance of the 10->8 mm brass compression fittings in my induction heaters tank circuit. Out of curiosity I measured the resistances in my tank circuit. I thought I’d make this small post about how to measure very low resistances. This might be fairly obvious to someone but it still bears mentioning. The easiest way to measure very low resistance is by passing a much […]

I had the need to test the saturation current of some inductors I had wound. I built this pretty simple tester for testing the saturation current of inductors. It seems to work pretty well up to about 100A or so. I had a switch-mode power supply (48V to some lower voltages at around a kW or so, from telecommunications equipment) laying around that had a lot of components (FETs, power […]