coils

Hi All, I have an Arduino sending digital signals through transistors, driving some DIY motor coils, simple: Arduino digitalWrite() -> transistors -> coils. It works great, plenty of force and no fire. V-in is 5 volts and each coil is 2 ohms, so about 2.5 amps per coil. One problem though is...

I'm wanting an undersea short-range remote (wireless button for dive thrusters) and induction seems perfect, so I bought a passive keyless car alarm to see how they work. I do understand that the car transmits an inductive signal, which the remote picks up (and then the remote does it's own...

Hello everyone! I'm building a bifilar coil to transfer power wirelessly. to generate the signal for transmitter coil, I'm building my own function/signal generator with this youtube video - . but it doesn't work well with higher frequencies (1-10MHz) . So my question is how can I lower the...