The Problem Of The Month this month was how to lower the volume on a childs toy.
The speaker is driven from two pins of the processor. The DC resistance of the speaker is 9.3 Ohms. Several suggestions were made on how to reduce the volume. I will report here on the first few things I tried. I downloaded an app on my iPhone to measure loudness. The app was very specific in stating that the values measured were approximate. LAeq Max LCPeak TWA unmodified 85.90 91.20 102.40 52.00 22 ohm in series 80.00 86.60 96.60 46.20 47 ohm in series 74.00 80.70 90.80 xxx 47 uf in series 87.70 93.50 104.20 55.30 1 uf in series 76.30 83.10 95.40 xxx To my untrained ear, I found the 1 uf to be a good result. I did not notice a change in the tonal qualities, but I am untrained and old (so I don't hear high frequencies). ---> Paul
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