cnlohrcnlohr@chaos.social
Jun 29, 2026, 9:52 PM@dequbed They charged a good bit extra because it was a "coil"
Replies
Janajanamarie@mystical.gardenJun 29, 2026, 10:03 PM
anyMouseanymouse_404@glitch.socialJun 30, 2026, 1:17 AM@janamarie @cnlohr @dequbed Why don't PCB fabs like pcb coils?
- Janajanamarie@mystical.gardenJun 30, 2026, 7:44 AM
@anymouse_404 @cnlohr @dequbed because fabs like to actually delivery you a working product of a certain quality level, basically they want to deliver what you ordered. This is an effort that varies with the 'complexity' of the board, e.g. feature size, milling operations, via size, via count, copper distribution, etc... A coil is extra complicated because it is just one single long trace, often with the smallest feature size (meaning tight tolerances) and it is quite tedious finding errors within coils. A coil with a few shorted traces shows up exactly the same on a flying needle tester as a non-defective one, but it probably wont be usable
nadjadequbed@mastodon.chaosfield.atJun 30, 2026, 7:53 AM@janamarie @anymouse_404 @cnlohr also you will generally use PCB coils for the kinds of frequencies where the tiny changes from board to board in what is essentially a stochastic process (etching) make a large difference.