[TriEmbed] P.O.T.M. preliminary report

[The MacDougals]

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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