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Reduced Price Classroom Morse Code Practice Oscillator Expand

MFJ Classroom Morse Code Practice Oscillator

MFJ Enterprises, Inc.

MFJ-554 by MFJ Enterprises, Inc.


The MFJ-554 is profesional quality code practice oscillator designed for demanding classroom use and abuse.

More details

The MFJ-554 comes with a trimpot to generate a symmetrical rise time and fall time of the input signal which eliminates the unwanted keyclicks that are normally heard from keyers.

The MFJ-554 produces a true pure sinewave so you'll hear the clearest sounding tone you have ever heard from a code practice oscillator.


  • No Harsh Keyclicks: Produces a true pure sinewave sidetone with no trace of harsh keyclicks.
  • Perfect complement to any keyer paddle.
  • Loud and Clear: Classroom instruction of Morse Code by delivering a full 1W into internal 3" speaker. To make it ever louder, use the MFJ-281 ClearTone™ external speaker.
  • Low Distortion: Typically less than .2% total harmonic distortion from its BTL (Bridge-Tied-Load) amplifier.


  • Volume Control.
  • 400-1000 Hz Tone Control.
  • On/Off Power Switch on LED.
  • ¼" Key Jack.
  • 3.5mm External Speaker Jack.
  • Input power: 12 VDC.
  • All metal enclosure.

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