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I am working on a simple PICAXE (4.5 Volt) project that plays
a (downloaded ringtone) rtttl sound file
... the melody's volume should be loud enough
for a "doorbell-like" alert whereas the sound quality
should be as good as an old-school's mobile ringtone output.
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how may i improve the sound's output quality?
The (ringtone) melody sounds even worse than expected -
it is noisy and the melody not really good
probably due to my piezo sounder * (?)
So i might need to use a speaker instead of a piezo-sounder ...
- which (budget) speaker* would you recommend ?
May you give me any advice on how many watts,
which make, additional/integrated amplifiers, condensators, ...
i should use?
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* i tried a piezo sounders & transducer
... piezo-transducer (www.conrad.de, # 752223 - 62)
... piezo-sounder (www.conrad.de, # 710131 - LN )
whereas the latter produced sounds of better quality
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... and looked for speakers
& through several entries on forums
some of them recommending ...
- computer speakers
since they are amplified already.
That coukld be the best solution
but i would prefer to build my own,
not breaking casings, hacking/de-soldering existing pcb's
(eventhough it would help to improve my very bad soldering skills)
- use speakers with 40 or 80 ohm values
... some users about of 40 ohm speakers
mentioned that their output is too silent
for a tune built on wide range of sounds
- add capacitors
... 1x 10 uF, non-polarized capacitor
in series with a 40ohm speaker
(as recommended & shownin the picaxe manual)
or
... 2x 10 uF - 1 in series and
1 in parallel with a 40ohm or 80 ohm speaker
(as illustrated the picaxe manual)
or
... 22 uF
to prevent speaker from burning
since the "sound" command leaves the port "high"
or,
alternatively using " low (-- port # --)" to reset the port
(this being critised since it might cause a too low output)
... 1 uF for best range of several sounds
- boost speakers
using the lm386 chip to boost the output
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