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
    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
    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 -