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Author Topic: How to make speaker louder.  (Read 969 times)
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I am using the speaker found on http://www.jameco.com/1/1/1925-gc0201m-32-speaker-round-32ohm-8-inch-dx-169-inch-h-micro.html. It is hooked up to an arduino UNO R3s pwm pin with a series resistor of 50ohms. The loudness is not getting anywhere near the specified 78dB even when I send 5V directly to the speaker. Anyone know how I can increase the loudness?
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Oh and the max power rating is .2W. Using the equation P=V^2/R gives .2=V^2/32 => V=2.5V. 2.5V across the speaker is not loud at all.
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The loudness is probably only possible to reach within the speakers frequency limits. For this speaker 700Hz to 8000Hz.

For the lower frequencies a box (or similar) is needed to stop air from going between front- and backside of the speaker.
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I recommend u build a simple AMPLIFIER circuit like this one:

http://youtu.be/E5NjcZkJtFM

if u r too elite then search for a better amp circuit on YouTube and if u r too novice then find a simpler one.

Good luck
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Same chip, different circuit -

http://rcarduino.blogspot.com/2012/08/adding-audio-to-arduino-projects.html

Duane B

rcarduino.blogspot.com
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