Crystal Radio Coil, Fine-Wire Small Core Experiment 3/3 скачать в хорошем качестве

Crystal Radio Coil, Fine-Wire Small Core Experiment 3/3

We are running experiments to see why the bobbin windings in a capacitively tuned crystal radio did not work. There was almost no sound. This round we are checking the effects of smaller diameter coil cores. We are starting with a known, working coil and 1 by 1 varying the parameters that were changed with the bobbin coils: -- Wire diameter, straight wind (video #1) -- Core size -- Winding type (straight 1 layer vs. multi-layer scatter) KNOWN STANDARD COIL: Wire size big: 0.81mm (20 AWG)(Done/standard) Straight wound Core: 42 mm (1.65") PVC plastic Inductance total: 205 uH Taps: 0T, 20T, 30T, 80T EXPERIMENTAL COIL: https://coil32.net/online-calculators... Wire size fine: 0.227mm (31 AWG)(Done/standard) Straight wound Core: 8 mm (x") PLA plastic Inductance total: 205 uH Target (207 measured) ENTER THE INPUT DATA: L = 205 uH – Required inductance D = 8 mm – Diameter of coil-former circumference = 25.13 mm d = 0.227 mm – Diameter of wire without insulation 31 AWG k = 0.24717 – Diameter of wire with insulation RESULT: N = 780.822 – number of turns l = 192.997mm – Length of winding Length of wire = 25.13mm x 780.822T = 19,622.05686mm or 19.6 meters 20T / 130T = 0.1538461538461538 (x 780.822T = 120.1265T) (x 19.6 m = 3.01539 m) 30T / 130T = 0.2307692307692308 (x 780.822T = 180.19T) (x 19.6 m = 4.5231 m) 80T / 130T = 0.6153846153846154 (x 780.822T = 480.5058T) (x 19.6 m = 12.0615 m) BOBBIN COIL (capacitively tuned version): Wire size fine: 0.227mm (31 AWG)(Done/standard) Multi-Layer Scatter Wound Core: 8 mm (1.65") plastic Inductance total: 219 uH Taps: 0T, 10T, 15T, 40T RELATED VIDEOS: Crystal Radio--The Bobbin Inductors Fail. But WHY? 2/2    • Crystal Radio Bobbin Inductors Fail. But W...   Crystal Radio--No More Small Core Inductors??? Maybe. 1/2    • Crystal Radio--No More Small Core Inductor...   Crystal Radio--Cheap & Easy Inductor From Sewing Machine Bobbin    • Electronics--Cheap & Easy Inductor From Se...   1 Capacitor Crystal Radio--No More Variable Capacitor Designs? (4K)    • Crystal Radio-No More Variable Capacitor D...