Crystal Radio-How To Make The Best/Easiest One - No Batteries, No External Power 2024 (4K) скачать в хорошем качестве

Crystal Radio-How To Make The Best/Easiest One - No Batteries, No External Power 2024 (4K)

How to make a DIY crystal radio - no batteries, no external power. Step by step. No special tools or skills. Most parts can be had from recycled things. The purchased parts run about $3. Good during power failures, when batteries are not available, for prepping, etc. Depending on your design (coil mostly) it can receive in the AM broadcast band, approximately 535 to 1600 kHz. See Warnings below. RELATED VIDEOS: Crystal Radio-Winding The Coil (ABRIDGED)    • Crystal Radio-Winding The Coil (ABRIDGED)   Crystal Radio Coil Sizing    • Crystal Radio Coil Sizing (4K)   Mount Ball-Knob Handle On Steel Shaft    • Mount Ball-Knob Handle On Steel Shaft   Crystal Radio Antenna    • Crystal Radio Antenna (Shortwave Also)   Crystal Radio 3D Printable Parts    • Crystal Radio 3D Printable Parts (4K)   My Crystal Radio Does NOT Work (FIXES for common problems)    • My Crystal Radio Does NOT Work (FIXES for ...   This one is loosely based on the Cub Scout / Wolf Scout / Boy Scout crystal radio design. OPERATION TIPS & TRICKS A good antenna is important. Longer is usually better (see antenna warning below), a good ground is next most important. With some stations, you can put a finger or 2 inside the tuner coil to improve reception. Move them around for best reception. A finger near the coil can also improve reception. Touching the coil directly usually lowers sound volume, BUT a piece of paper or thin plastic between finger & coil often improves sound / tuning. Move finger around. Touching different parts of the radio or getting near them can affect performance. TOOLS Screw driver Knife Sandpaper (fine) Saw, for wood & tube Hand drill for screw holes (Optional) Soldering iron, solder MATERIALS 1 x Germanium Crystal Diode (1N34A)(bought: Amazon, Digikey, Jameco, Mouser...) 1 x Resistor (10k ohm)(bought: ditto) 1 x Crystal earphone (can NOT be other type)(bought: Amazon, Jaycar, Jameco?) MUST be like the type in the video. Regular iPod or similar will NOT work. 1 x Base 21 x 17.5 cms x 2 cms thick or more (wood scrap) 1 x PVC pipe 15 cms long or stiff cardboard tube x 2 inch diameter 1 x motorcycle / bicycle spoke, 2mm diameter or brass rod or stainless rod Enameled bell wire (can be from old transformer, solenoid, ...) (note: I used 0.91 mm or 19 AWG.) Screws, stainless or brass (6 for wire hold downs, 2+ for coil mounting), Fahnestock clips (2) (bought: Amazon & electrical shops). OR brass washers (13) (bought, hardware store) 3 stainless fender washers for wiper. 1 bigger, large head screw for wiper. 1 felt washer (chair foot floor protector. Hardware Store) ANTENNA & GROUND Antenna are just a long piece of wire (I use scrap wire from old transformers). The longer the better. Try different lengths and orientations (vertical, horizontal) A good ground helps. A wire to a ground rod is good. Metal water pipes also work well. NOTES: The resistor is necessary to get the best sound from these "new" crystal earphones. The new ones are piezoelectric and have lots of capacitance. Without the resistor the charge builds up then discharges so you get constant "static" sounds. The resistor bleeds off charge so you get louder, and much clearer sound. Also called a foxhole radio. WARNINGS: Never connect radio to any source of power. Not house current, nor batteries, nothing! Never use the radio during lightning storms. Never run an antenna over or near power lines. Disconnect antenna and put lead outside when not in use. Never ground to electrical items, plugs or similar. If you don't know, don't do it. INTERESTING LINKS Air Core: http://www.circuits.dk/single-layer-a... OTHER CRYSTAL RADIO VIDEOS Connect DC Amplifier to Crystal Radio   • Connect DC Audio Amplifier To Your Crystal...   3D PRINTED WIPER RADIOS Crystal Radio, Simple With Cat Whisker https://www.thingiverse.com/thing:641... Crystal Radio (Fastest Print 7 hrs) https://www.thingiverse.com/thing:626... Crystal Radio Base V1.1 (Faster) https://www.thingiverse.com/thing:620... Crystal Radio Base V1.0 (Slow) https://www.thingiverse.com/thing:620... ▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬ 00:00 Intro 00:41 Upgrades From The Original 01:32 First The Coil! 03:43 Bases: Wood, Plastic, Hybrid 05:05 Tower 06:24 Marking The Pillow Blocks 08:18 Making Pillow Blocks 17:41 Coil & Tower 3D Printed 17:59 Hybrid Pillow Blocks & Tower 19:39 Coil Mounting: Wood 20:53 Coil Mounting: Wood, Measuring & Marking the Base 24:55 3D Printed Tower Mount 25:43 Wood Tower Mount 26:50 Summary to this point 27:13 Electrical Wiring Overview 27:53 Fahnestock Clips 28:49 Brass Washer Connectors 30:10 3D Printed Tower Wiring 33:49 Stripping Enameled Wires 35:40 Wiring the brass washer connections 36:10 Wiring summary/testing 36:49 Wood base wiring 41:52 Wood base wiring done/review 42:49 Compare 3D base/Wood base 43:05 Make the wipers 50:15 Mount the wipers 51:26 Wiper, length & Knob 52:12 Sand Coil 54:15 Add last components 57:19 Quick Demo