[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# Re: [femm] Solenoid Question

- To: <femm@yahoogroups.com>
- Subject: Re: [femm] Solenoid Question
- From: "James Stephenson" <j.stephen@attbi.com>
- Date: Tue, 20 Aug 2002 20:54:26 -0600
- References: <ajumd1+c8m9@eGroups.com>

xeno_tropic, Every parameter that you mentioned is critical (wire diameter, core diameter/length, # of turns). Obviously you need to keep the device specification tolorance in mind before answering these questions. I can tell you that small variations in the four variablesyou mentioned can have large consequences from an inductance perspective. The inductance of a solonoid is a strong function of the number of turns and the core material permeability. The wire diameter has less of an effect on the inductance at audio frequencies as long as we assume the wire diameter is much smaller than the core diameter. Hope this helps....please get other opinions! James ----- Original Message ----- From: xeno_tropic To: femm@yahoogroups.com Sent: Tuesday, August 20, 2002 6:20 PM Subject: [femm] Solenoid Question `Hello. I have a question. I do not need to know about solenoids specifically, as in actuators. I am building variations of a device which must generate a time-varying magnetic field at audio frequencies. The current source is the audio output jack of a CD player. I wound a small coil around a ferrite core, using fine magnet wire from Radio Shack, two layers, tightly wound both leads at one end. Now I wish to make many of the devices, and wish to avoid winding all those coils. I would like to purchase ready-made ferrite core coils. My question is, what factors might affect: 1. The strength of the magnetic field 2. The signal characteristics as to reproducing it faithfully, like the first coil I made Is wire diameter, number of turns, diameter or length of core critical? It isvery important that I get this right. Thanks in advance for your help. James Roberts` `Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.`

- Follow-Ups:
  - Re: Solenoid Question
    - From: "xeno_tropic" <xeno_tropic@yahoo.com>

- References:
  - Solenoid Question
    - From: "xeno_tropic" <xeno_tropic@yahoo.com>

- Prev by Date: Solenoid Question
- Next by Date: Re: Solenoid Question
- Previous by thread: Solenoid Question
- Next by thread: Re: Solenoid Question
- Index(es):
  - Date
  - Thread