Re: TI-H: Built in speaker
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Re: TI-H: Built in speaker
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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