Designing your own HV Transformer
Now, let’s see how I could choose the materials and design the transformer – without any pesky mathematical formulae!
Picking a core
The first challenge was to find a suitable core from my junk box. First off, recall from Part 1 that this couldn’t be iron (too ‘slow’ for 151 kHz), and it couldn’t be air (too ‘weak’ for 25mA). I suppose I could have tried plastic, milk, or even beer – but I knew better. I knew about a substance called Ferrite.