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I placed the resistor not to overload the transistor base. Probably better in the long run to do that. Maybe smaller resistor values will also do the job. Transistor Base Resistor Calculator

For the speed sensor I'm using a Bafang sensor that I had laying around. It comes with a nice and strong holder that has the option to adapt the distance to the magnet. Also nice is the LED that indicates the magnet. You can buy those here: 6.81￡ 27% OFF|1Pc Elektrische Fiets E Fiets Speed...

Hi, I found this discussion since I'm working on a similar project and this is my first post. To make the coil I designed a coil holder. It can be printed on a resin printer without supports. I'm using 100 windings of 0.25 mm copper. I have put a 5 ohm resistor in series with the coil since that...