Electronics from your Kitchen Drawer
summary
Homemade parts include graphite-PVA conductive glue resistors (examples: stable ~10 Ω, drawn film ~33 kΩ, a 1 MΩ that collapses under 500 V), capacitors from wax paper and book-plastic (a 21 cm 50 pF wax-paper unit and an 820 pF PVC sheet) and a rolled ~400 µF electrolytic made by anodizing aluminium foil in bicarb, initially leaky but reformable to ~2.5 MΩ. Diodes from oxidized copper and zinc show usable rectification (ZnO: ~2 V forward, ~4 V reverse knee). Test rigs: BBQ burner, clothes-iron laminator, DIY curve-tracer using a transformer and CRO. A crystal radio is assembled but long-term stability of DIY dielectrics needs work.
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chapters (23)
- 0:00Intro
- 0:45Components nowadays
- 1:42Resistors
- 3:17Resistor Quality
- 6:24Skin Effect
- 7:55Second Resistor
- 8:27Attaching wires to things
- 9:10Making Conductive Glue
- 12:00Third resistor
- 13:23Fourth resistor
- 14:39Resistor Summary
- 16:37Capacitor Dielectrics
- 19:04Waxed Paper Cap.
- 20:34Good capacitors
- 22:11Plastic cap
- 24:01Bigger caps
- 24:33Electrolytic Capacitor
- 28:48Summarising Capacitors
- 29:10Diodes
- 31:40Octopus circuit
- 35:59Zinc-Carbon Cell
- 37:44Making a Diode
- 39:43Crystal Set
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