Need Variable Frequency Oscillator Coil Design Help

Discussion in 'General Electronics Chat' started by magnetman12003, May 10, 2008.

  1. magnetman12003

    Thread Starter Active Member

    May 10, 2008
    31
    0
    Hi all,

    Everyone is familiar with what a older 10 inch degausing coil loop looks like.

    It works with 120 volts AC at 60 HZ and is used to degauss tv monitors.

    I am trying to find a way to power that same type/size of coil loop whereas I can control the frequency from 0 on up to say 300 HZ.

    Does any one have a simple 10 inch loop variable frequency oscillator circuit ( single transistor) thats fed with a low dc voltage power supply. Say 12 to 19 volts DC.

    This loop then should be able to transmit this lower frequency a short distance. Frequency could be selected to whatever desired.

    Any help will be appreciated.

    Thanks, Tom
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    A tv degaussing coil has enough inductance to keep the current through it down to a reasonable level. It's not frequency selective - it it operated off the 60 Hz line.

    Your interest seems to be involved with inductive coupling so all you need to do is wind a coil and drive it with a transistor fed by a 300 Hz oscillator. The oscillator should be sine wave for best performance.

    Here is a link to a freeware coil inductance calculator - http://www.datavoyage.com/coilmaestro/.
     
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