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Small speaker not loud enough
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Author:  ethane182 [ 25 Feb 2015, 11:29 ]
Post subject:  Small speaker not loud enough

Hi there,

This is my first DIY audio project so be gentle! I'm feeding an approximately sinusoidal signal into my small 8 Ohm, 0.5 Watt speaker but it is barely audible, even when fed with 15V peak-to-peak. I suspect the current is too small, but I can't figure out how to successfully use a BJT or darlington pair to increase the current. How do I get my speaker to SPEAK louder?

Thanks,
Ethan

Author:  Suncalc [ 26 Feb 2015, 22:59 ]
Post subject:  Re: Small speaker not loud enough

15v peak to peak is 5.3v RMS. Across an 8Ω speaker this is approximately 3.5w. You probably blew the speaker coil. How did you get the AC waveform? Can you supply a diagram of what you did?

Author:  ethane182 [ 04 Mar 2015, 09:32 ]
Post subject:  Re: Small speaker not loud enough

Ah, I hope not, but that would explain the barely audible sound. I'm getting the AC waveform from a PWM square signal by feeding it through a simple RC lowpass filter with R = 1000 Ohm and C = 10nF. The signal isn't perfectly sinusoidal but I don't need good audio quality at all, just different pitches.

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