This is my first attempt at a ferrite core crystal radio. It cost around $40 in new components I had to buy. The build went well. There might be some tricks worth copying. I won't recommend other people build it, it has low sensitivity and the selectivity does not matter because there's nothing to select!

MATERIALS
Ferrite Rod 100x10mm, manganese zinc magnetic permeability 1K
2x hold down blocks
32 AWG wire 0.2032mm; Windings: 10/60/40 in the SAME DIRECTION
Resistor 10k40k ohms
Variable cap: 0 to 400 pF or 0 to 500pf
Variable cap mount
Brass washers
Stainless screws
Crystal earphone
1N34a diode

3D Printed Ferrite bar holders https://www.thingiverse.com/thing:652...
3D Printed Mica Variable Capacitor Mount https://www.thingiverse.com/thing:652...

CHAPTERS
00:00 Introduction
00:15 Parts
01:38 Circuit diagram
04:03 Parts dimensions
04:52 Construction, ferrite rod wrapping
08:11 Main coil
09:00 Slider plan
10:03 Slider cores in place
11:49 Ferrite coils done
12:23 Board parts layout
14:17 Build it
15:39 Built & Fixes
18:00 On the scope
20:36 Conclusion