amtrak IC help
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Posts: 46,084
Hey group
I was recently on a amtrak from Oregon to Washington, it was of the
new "cascade" trains made by talgo.
It had a radio thing built into the seat.
(here is my rendition of it
http://www.angelfire.com/fl5/djx/amtrak.swf)
There were 7 channels of music that you could select with the up/down
buttons and you could alter the volume with the plus/minus.
Im pretty sure how it works is that there are 7 different recievers
for the different stations which are selected with a selective input
IC and then some kind of volume chip to control the volume to your
headphones
Can this be made with some integrated circuits or if I have to use a
stamp?
If anyone has ANY info or suggestions in the construction of this
unit I would love to hear from you
Duncan Fairley
Djdunkman@h...
I was recently on a amtrak from Oregon to Washington, it was of the
new "cascade" trains made by talgo.
It had a radio thing built into the seat.
(here is my rendition of it
http://www.angelfire.com/fl5/djx/amtrak.swf)
There were 7 channels of music that you could select with the up/down
buttons and you could alter the volume with the plus/minus.
Im pretty sure how it works is that there are 7 different recievers
for the different stations which are selected with a selective input
IC and then some kind of volume chip to control the volume to your
headphones
Can this be made with some integrated circuits or if I have to use a
stamp?
If anyone has ANY info or suggestions in the construction of this
unit I would love to hear from you
Duncan Fairley
Djdunkman@h...
Comments
I think this could be done fairly easily. It will
require a Stamp for logic control and switch
monitoring. It will then run the below. Here's my
suggestions:
Channel selection:
Use a Maxim MAX307 (see DigiKey for data sheets) dual
8 chanel analog multiplexer. With 5 I/O lines, you can
select 16 lines (8 x L + R) to be directed to 2 common
outputs. This would allow 8 stereo sources to be
switched to 2 output lines. These output lines could
then be buffered and their volume controlled.
Volume control:
Use a Maxim DS1867 (see maxim-ic.com for data sheets)
dual chanel, 256 step, 3 wire serial digital
potentiometer. This simple device takes the 3 wire
serial data and adjusts 2 potentiometers. These are
non-volitile, so they will retain their setting with
power off.
With the multiplexer, digital potentiometer, an analog
power supply, a couple op-amps, and a Stamp with
switches, you could have a nice little music/analog
switching system. The beauty of Maxim is that they
will send you free samples! Add a good Maxim dual
op-amp to the list and besides the Stamp, power
supply, and PCA, your project is free.
Enjoy,
Dr. Diode
--- Duncan Fairley <Djdunkman@h...> wrote:
> Hey group
>
> I was recently on a amtrak from Oregon to
> Washington, it was of the
> new "cascade" trains made by talgo.
>
> It had a radio thing built into the seat.
> (here is my rendition of it
> http://www.angelfire.com/fl5/djx/amtrak.swf)
>
> There were 7 channels of music that you could select
> with the up/down
> buttons and you could alter the volume with the
> plus/minus.
>
> Im pretty sure how it works is that there are 7
> different recievers
> for the different stations which are selected with a
> selective input
> IC and then some kind of volume chip to control the
> volume to your
> headphones
>
> Can this be made with some integrated circuits or if
> I have to use a
> stamp?
>
> If anyone has ANY info or suggestions in the
> construction of this
> unit I would love to hear from you
>
> Duncan Fairley
> Djdunkman@h...
>
>
>
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