Re: TI-H: Built in speaker


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Re: TI-H: Built in speaker




How does the walkman work?  Does the calc send data out the linkport on AM
freqs also?

>Okay, that was long.  For anyone of you that have a walkman and don't want
>to spend 3 dollars making it, just tune the AM radio to an unused freq. and
>put it close to your calc.  The sound is very rich.  The piezo thing is
>simple.  Just connect it to ground and R or W.
>
>>I don't know if it will fit, but "MINIATURE PIEZO BUZZER ELEMENT"
>>Catalog number 273-064 is LOUD. It costs $1.79, but it is in a
>>reverberation case that "shapes" the soundwaves comming out so they
>>sound louder. only catch is it is thicker cause of the case. It runs on
>>between 3-28 volts, and at 12 volts it creates 76 decibels. I usualy
>>cross the red and blue wires and connect those to the tip and middle
>>pins of the link port. the black wire goes to the base (closest to the
>>bottom of the calc. It's ground for those who are new to TI
>>electronics). I'm not sure, but some programs use either or even both
>>signal lines for 1-bit stereo. A small switch (DPDT) should have the two
>>center pins connected to the tip and middle pins of the link port. The
>>two pins to one side should be soldered together and the red and blue
>>wires connected to those. The black wire can connect to either the base
>>pin on the link port or the base ground (my preference). There are the
>>two large exposed surfaces of copper where the two screws connect the
>>foil cover over the back of the board. The switch fits very nicely to
>>the side of the battery case. Has to be small though. My only question
>>is whether the thick buzzer will fit? It is 15/16" diameter (almost an
>>inch) and it's 5/16" thick.
>>
>>Someone should try it, cause I can't for a while.
>>
>>If someone can make a 15/16" hole in the back of the case and have the
>>speaker stick out a little bit, just enough to allow the cover to slide
>>over it, then there might be enough room. also, if someone has a
>>grinder, you could probably grind the entire top off and drill a tiny
>>hole in the case. This method would allow the case to become a part of
>>the buzzer's case. Try stuff! my calc has backlight, SPinTerface,
>>Acceleration, and NO room, so If I can find the room for it, anyone else
>>can. If I can fit it into mine, I'll post it.
>>
>>Much more dificult (only finding the parts, not the work) would be to
>>get a standard thin piezo element and a properly sized O-ring (like in a
>>water faucet. you can get them at a hardware store). glue the O-ring in
>>to the case somewhere where there is room. Drill a hole in the calc case
>>in the center of the O-ring. Then glue the piezo element to the O-ring.
>>You could probably drill a few holes on the side of the calc to allow
>>sound to come out better. Maybe 2 holes on each side (don't hit the
>>circuit board. The enclosed nature of the calcs case may act as a giant
>>audio resonator and make the sound come out richer. Yesterday I built a
>>speaker with an audio resonance chanel. It is AWESOME. It is a cheap
>>little 3" speaker with bass pounding out from a small opening on the
>>bottom front. I want to build two using +8" speakers. The calc case may
>>have a similar effect to the speaker I built.
>>
>>You could add a tiny variable resistor to control the loudness. 1-10K is
>>fine. It HAS to be small though. make sure to keep glue out of it or
>>it's RUINED!
>>
>>You could also create 2-bit sound. It isn't much for improvement, but  I
>>think it is possible. You simply need a resistor or two that reduce the
>>sound level and when combined allow the combined current through the two
>>to be close to the current from one. (the current won't combine from
>>both to make it louder. I tried.) I don't know any programs that use 2
>>bit sound though.
>>
>>The sound would be something like this:
>>
>>5v |              |
>>   |              |
>>   |          |   |
>>   |          |   |
>>   |      |   |   |
>>   |      |   |   |
>>0v +------+---+---+--
>>     00  01  10  11
>>
>>If someone wants to try it, go for it!
>>
>>>
>>>
>>>
>>>>I've done it.  Use a piezo transducer and that will not freeze your
>>>calc.
>>>>Unformally called a beeper.
>>>>
>>>>Grant
>>>
>>>Great! Now can you get some (Rat Shack) part numbers and make a little
>>>picute for the switch stuff? Call me stupid, but I don't do electronics
>>>that well... the mose advanced thing I've done was slicing a wire to
>>>make a headphone jack and put tape all over it! (I wan a built in one
>>so
>>>everyone can hear it! And make it louder...)
>>>
>>>-Joe Martis
>>>
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>>>
>>
>>
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>
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