Anyone who has ever wound a toroidal coil by hand can tell you that it’s not exactly a fun job. Even with the kinds of coils used in chokes and transformers for ham radio, which generally hav… ...

Reminds me of my first coil winder as a kid. A drill, a magnet, a reedswitch and a calculator. enter +1 = with = being wired to the reed switch. Manual positioning, but auto winding and counting.

“Coil bind” occurs when a spring’s coils stack solid at or before full camshaft lift. How Much Valvespring Coil-Bind Clearance Is Safe?

Nikola Tesla - The Tesla Coil. To investigate the electrical realm of high-frequency and high-voltage, Tesla invented an apparatus that pushed the limits of electrical understanding.