Re: TI-H: Built in speaker
[Prev][Next][Index][Thread]
Re: TI-H: Built in speaker
Maybe an modification can be done with the use of a potentiometer. You can
change the resistance thus, change the volume of the piezo buzzer. If it
is not loud enough, maybe an addition of more volts with a battery pack.
Then you have a heavy TI.
On Fri, 12 Dec 1997, Richard Piotter wrote:
>
> 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
> >
> >______________________________________________________
> >Get Your Private, Free Email at http://www.hotmail.com
> >
>
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>
References: