Electronic Switching
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I'm after a component that will turn multiple switches(8 hopefully) on
and off when I send either a high or low to the device through a
single pin. It must be solid state and cmos level compatible, and
hopefully cheap and common. I was considering simply connecting
multiple transistor bases to a single pin, if that is feasible. Or a
multiplexer or a quad analog switch perhaps? I'm not totally sure what
those last two do though. Can anyone help?
Paul Lugger
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and off when I send either a high or low to the device through a
single pin. It must be solid state and cmos level compatible, and
hopefully cheap and common. I was considering simply connecting
multiple transistor bases to a single pin, if that is feasible. Or a
multiplexer or a quad analog switch perhaps? I'm not totally sure what
those last two do though. Can anyone help?
Paul Lugger
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
Comments
you use a resistor in series with each transistor base. Take care to not
excede the maximum drive from the stamp. A hex buffer (7404 for example)
may be used to isolate each transistor and increase drive current as well.
a multiplexer, as used here, would take serial data in and output it as
parallel and an analog switch is not really suitable in this application.
Jim
Original Message
From: p lugger2 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=qrV8FEdIO42SzGmymEgfrHUIJyBbdHwrJtsXnW-nwnOG9rtap49u-UXkUsWqXONtUol4diHH7ngpjvSX-A342g]plugger2@s...[/url
Sent: Wednesday, May 22, 2002 5:13 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Electronic Switching
I'm after a component that will turn multiple switches(8 hopefully) on
and off when I send either a high or low to the device through a
single pin. It must be solid state and cmos level compatible, and
hopefully cheap and common. I was considering simply connecting
multiple transistor bases to a single pin, if that is feasible. Or a
multiplexer or a quad analog switch perhaps? I'm not totally sure what
those last two do though. Can anyone help?
Paul Lugger
__________________________________________________________________
Get your free Australian email account at http://www.start.com.au
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>I'm after a component that will turn multiple switches(8 hopefully) on
>and off when I send either a high or low to the device through a
>single pin. It must be solid state and cmos level compatible, and
>hopefully cheap and common. I was considering simply connecting
>multiple transistor bases to a single pin, if that is feasible. Or a
>multiplexer or a quad analog switch perhaps? I'm not totally sure what
>those last two do though. Can anyone help?
>
>Paul Lugger
Hi Paul -
You may want to look at the Maxim MAX335 which has 8 SPST switches and is
serially operated. You can find more information at the link below:
http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=1077
Hope that gets you started.
Regards,
Bruce Bates
switches. But be sure and connect ALL unused switch inputs to either
Vcc or Common, or spurious noise can occur in your switched channels. I
found this out the hard way.
Dennis
Original Message
From: Bruce Bates [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=smqUkBVpZjgV4nCKUBBc4YQha71IXGmqgklfl1bg3omNibTvyZ6pSZS1kNYJ_9Z0dl3cgWA2C6zMbim2Fcg]bvbates@u...[/url
Sent: Wednesday, May 22, 2002 7:28 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Electronic Switching
At 07:12 PM 5/22/2002 +1000, you wrote:
>I'm after a component that will turn multiple switches(8 hopefully) on
>and off when I send either a high or low to the device through a single
>pin. It must be solid state and cmos level compatible, and hopefully
>cheap and common. I was considering simply connecting multiple
>transistor bases to a single pin, if that is feasible. Or a multiplexer
>or a quad analog switch perhaps? I'm not totally sure what those last
>two do though. Can anyone help?
>
>Paul Lugger
Hi Paul -
You may want to look at the Maxim MAX335 which has 8 SPST switches and
is serially operated. You can find more information at the link below:
http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=1077
Hope that gets you started.
Regards,
Bruce Bates
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