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Oscillators:  Audio
Last Updated on: Tuesday, April 22, 2008 04:12 PM

Oscillator Circuits -- Main Page
Circuits Designed by Dave Johnson, P.E. :

  • CMOS SCHMITT TRIGGER IC MAKES VCO
    By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1.  A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal.

Links to electronic circuits, schematics, or diagrams for engineers, hobbyists, students & inventors:

2 Tone Audio Oscillator (use for SSB Tests): (added  7/02)

2 Tone Train Horn: (added 10/02)
A Weighting Filter for Audio Measurements:  (Circuit / schematic design added 6/06)

Audio Oscillators: (Electronic circuit added 7/03)

Transistor Organ: (added  7/02)

Two Tone Audio Oscillator (use for SSB Tests): (added  7/02)

Two Tone Train Horn: (added 10/02)

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