Don't use bare wire as the current will flow across the coils (short) rather than around in a spiral. Get the spiral as tightly wound as you can and the entire coil should spiral in the same direction (clockwise). Your 'aTiny' microprocessor will probably need some help driving a coil. Where do you get '0.5A' from?

2011年4月27日 · First understand that coil guns are just solenoids which are just inductors. The difference is you switch the coil off just before the middle of the projectile reaches the middle of the coil. In order to understand this you need a good understanding of Amperes Law and Faraday's law of Induction.

2021年9月4日 · For an air-core solenoid, the geometry that gives the greatest magnetic field for a given quantity of conductor is to have the outer diameter of the coil to be approximately twice the inner diameter, and the cross-section of the coil to be approximately square. These dimensions give what is known as a Brooks coil.

2024年10月11日 · I'm trying to design a circuit that can drive an air-core coil with an inductance of 45uH. The coil has a resistance of 0.15 Ohm measured at 50 kHz. The circuit should be able to push up to 100A through the coil. The coil is water-cooled, so heat dissipation is not an issue.

2023年8月22日 · If you are absolutely certain that the coil is bad then your options are to find a replacement (not likely unless you can find an identical clock with a good coil,) or to rewind the existing coil. This is absolutely not rocket science. Make note (take pictures) of which way the wire is wound on the core. Unwind the wire from the coil.

2019年4月18日 · Alternating or pulsed current is required in the coil. The dimensions and specific material of the repelled object helps to determine the current induced and thus the force on the object. The described technique is used in waste recycling to separate conductive material from non-magnetic waste materials.

2022年1月23日 · The coil can transmit an alternating magnetic field but, usually its dimensions are so small that it makes an ineffective electric field generator hence, you only get a the M part of an EM wave. On the other hand, a proper antenna is good for generating the E and M parts of an EM wave in the right proportion to suit the impedance of free space.

2015年5月23日 · As a first impression, the impedance of that coil will be very low - so low you will probably have problems exciting it with a normal audio amplifier. Speaker coils use the iron from the speaker to have more inductance. If the coil can be 20mm, at 0.3mm trace width, you can have about 15 turns. Try that in this calculator. It gives about 5 uH ...

2021年4月22日 · A "Brooks coil" is a coil with a square cross section and an inside radius of the same dimension as a side of the square cross section. (from www.circuits.dk) The Brooks coil has the property of maximizing the magnetic flux for a given length of wire.

2015年1月25日 · If you have a coil made of ionized water or a coil made of metal with the same properties, you'll have the same solenoid. Whether the OP can make that water solenoid practical is up to him. The OP just wants to understand concepts from the basic nature of the question, and you're throwing him/her curve balls. \$\endgroup\$ –