PWM Signal from SoundCard

Create a pwm signal using a standard soundcard.


Updated Fri, 16 Dec 2005 09:53:35 +0000

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PWM Signals are used in a wide area of applications. Examples are a servos used for positioning in electromechanical control design (mechatronic). Here is a simple function that allows to create a pwm signal with a standard soundcard. Parameters are: pulsewidth and time between pulse-starts.

One restriction is that the approach allows duty cycles up to 50% only.

All you need is to add at the output of the soundcard is a resistor as load (1k) and a diode (1N4001). The image enclosed shows the output I got for:

>> PWMSound(1.5e-3,10e-3);

Cite As

Michael Wunder (2023). PWM Signal from SoundCard (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R14SP3
Compatible with any release
Platform Compatibility
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