Guest
after information on the mk5375 IC, also anyone know of a good DTMF
tone ic? i want to make a good dtmf keypad. thankx
tone ic? i want to make a good dtmf keypad. thankx
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In article <1168688448.695214.140120@s34g2000cwa.googlegroups.com>, pgstone@virtualcity.com.au wrote:
dialler". Pretty detailed, 11 pages.
It's in the Mostek 1984/5 Microelectronic Databook.
I would be willing to scan it if you can't find the info readily
elsewhere.
Do you already have this chip? Given its age, it might be hard to
buy, I would guess there are more modern and available ones.
Mike.
I have a hardcopy datasheet for MK5375 "ten number repertory tone/pulseafter information on the mk5375 IC, also anyone know of a good DTMF
tone ic? i want to make a good dtmf keypad. thankx
dialler". Pretty detailed, 11 pages.
It's in the Mostek 1984/5 Microelectronic Databook.
I would be willing to scan it if you can't find the info readily
elsewhere.
Do you already have this chip? Given its age, it might be hard to
buy, I would guess there are more modern and available ones.
Mike.
M
Michael Black
Guest
(pgstone@virtualcity.com.au) writes:
will also be provided by that phone. You can even simply repackage it,
or if it fits, just use the phone intact.
The earliest use of touch tones outside of telephones was to remotely
control things over radio. And the earliest touch tone pads for
that use were surplus touch tone pads from telephones. It was only
a few years later, as IC integration became better, that there were touch
tone encoder ICs available to the hobbyist, so they could build them up
from scratch. But usually that entailed by a costly keypad that happened
to go with the costly IC (which despite the cost was smaller than the
telephone pads, and the ICs made the encoder far more stable and reliable
than a lot of the interim solutions for the task).
Now it's gone full circle. The cheapest and most readily available
source is the phone once again.
Same thing applies every time someone needs an IC to build a digital
clock. If they want a single IC to do the task, they are generally
better off buying a commercially built digital clock.
The only thing this wouldn't apply to is if someone is actually building
in quantities, in which case buying a commercial unit starts becoming
too expensive once you get beyond a certain level of units.
Michael
the needed IC and keypad from there. Any other needed componentsafter information on the mk5375 IC, also anyone know of a good DTMF
tone ic? i want to make a good dtmf keypad. thankx
So go to the store, buy a really cheap touchtone phone, and extract
will also be provided by that phone. You can even simply repackage it,
or if it fits, just use the phone intact.
The earliest use of touch tones outside of telephones was to remotely
control things over radio. And the earliest touch tone pads for
that use were surplus touch tone pads from telephones. It was only
a few years later, as IC integration became better, that there were touch
tone encoder ICs available to the hobbyist, so they could build them up
from scratch. But usually that entailed by a costly keypad that happened
to go with the costly IC (which despite the cost was smaller than the
telephone pads, and the ICs made the encoder far more stable and reliable
than a lot of the interim solutions for the task).
Now it's gone full circle. The cheapest and most readily available
source is the phone once again.
Same thing applies every time someone needs an IC to build a digital
clock. If they want a single IC to do the task, they are generally
better off buying a commercially built digital clock.
The only thing this wouldn't apply to is if someone is actually building
in quantities, in which case buying a commercial unit starts becoming
too expensive once you get beyond a certain level of units.
Michael