I found two medicine bottles, one large and one small, to wind the coil.
The small coil was wound 20 times, and the large coil was wound 50 times. Because the magnetism of the electromagnet here is weaker than the magnet it replaces, the coil needs to be wound a few more times to increase the chance of success. The completed small coil must be able to fit into the large coil.
The paint on the ends of the large coil is scraped off with a wallpaper knife, one end of the small coil is scraped off, and only half of the other end is scraped off. As shown in the figure below, hold the coil upright and scrape only the upper part.
Make the bracket with copper wire as shown in the picture. The bracket is fixed on the wooden board with thumbtacks, and the width between them is just enough to fit the large coil.
The bracket is complete. The small coil is placed on the bracket, and a little foam is placed under the large coil, just under the small coil
Now start to connect the circuit. One end of the large coil is connected to the metal bracket on the same side, and the other end is stretched out, leaving the power supply.
Then put the small coil on the holder. Adjust the height and angle of the bracket so that the small coil can be rotated very flexibly and as close as possible to the large coil. Because the large coil below acts as an electromagnet, the closer it is to the center of the circle, the stronger the magnetic field, so the small coil can rotate in the large coil best.
Connect the lead wire of the large coil to one pole of the power supply, and connect the metal bracket on the same side to the other pole of the power supply.
Gently turn the small coil, give it an initial energy, you can see that the small coil turns faster and faster, and the DC motor model without magnets has been successfully made!
Audio Video Cable:Video cable, referred to as video cable, is composed of video cable and connector. Among them, video cable is coaxial shielded cable with characteristic impedance of 75 Ω (Ω). Common specifications are divided into - 3 and - 5 according to wire diameter, single core wire and multi-core wire according to core wire, common specifications of connector are divided into pressure joint and welding joint according to cable end connection mode, and equipment There are BNC (commonly known as bayonet) and RCA (commonly known as lotus head). Audio cable, referred to as audio cable, is composed of audio cable and connector. The audio cable is generally a dual core shielded cable, and the common connectors are RCA (commonly known as lotus head), XLR (commonly known as XLR head) and trsjacks (commonly known as pen plug).
Audio Video Cable
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