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|RC Audio Oscillator
|Here is the design of an audio
oscillator that runs at approximately 1 KHz. I don't remember where I
got this circuit, probably from EMFRD, since Wes's book is a treasure
trove of useful circuits. This handy oscillator can be used as a source
of audio for testing out audio stages in receivers and the like, or as
a stable signal source for testing microphone circuits in
A schematic of the audio oscillator. What is not shown is the 8-volt regulator circuitry that is part of the finished module. Just use your favorite part and circuitry there, it isn't critical at all.
This photo shows how the RC Audio Oscillator was built.
The 8-volt regulator is the taller 3-terminal device to the rear with the tantalum capacitors on either side.
A small "U" bracket is soldered to the PCB substrate to support the level adjusting output pot.
This view shows a bit more detail of the 0.01 uF capacitors, the red-orange units in the foreground, used along with the 5.6K resistors to set the frequency of oscillation. These capacitors can be changed for a higher or lower audio tone.
This is a scope plot showing the output of the RC Audio Oscillator with the pot set for maximum signal.
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