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Science Forum Index » Electronics - Components Forum » 4P2T switch -what's available
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| no-spam2@lycos.com |
 Posted: Sat Feb 10, 2007 7:48 pm |
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Guest
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I need a 4 pole double throw switch, but all I can find are toggle
switches like this:
http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=2343&doy=10m2
What other types of switches of this type (4P2T) are available, and
where?
I'd prefer something like a PCB solderable slide-switch in a vertical
position, but I'll consider anything smart and modern looking. |
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| Eeyore |
| Posted: Sat Feb 10, 2007 8:35 pm |
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"no-spam2@lycos.com" wrote:
Quote: I need a 4 pole double throw switch, but all I can find are toggle
switches like this:
http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=2343&doy=10m2
What other types of switches of this type (4P2T) are available, and
where?
I'd prefer something like a PCB solderable slide-switch in a vertical
position, but I'll consider anything smart and modern looking.
4 pole switches aren't very common. What load current and voltage are you
switching ?
Graham |
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| no-spam2@lycos.com |
| Posted: Sun Feb 11, 2007 10:19 am |
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On Feb 11, 1:35 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
Quote: 4 pole switches aren't very common. What load current and voltage are you
switching ?
It's just for video signals. I don't know the voltage/currents, but
I'm pretty sure it can't be more than 12V and a few mA. Any low
voltage switch should do. |
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| Lostgallifreyan |
| Posted: Sun Feb 11, 2007 11:18 am |
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"no-spam2@lycos.com" <no-spam2@lycos.com> wrote in
news:1171203560.200844.317960@q2g2000cwa.googlegroups.com:
Quote: On Feb 11, 1:35 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
4 pole switches aren't very common. What load current and voltage are
you switching ?
It's just for video signals. I don't know the voltage/currents, but
I'm pretty sure it can't be more than 12V and a few mA. Any low
voltage switch should do.
Maybe a pair of DG111 analog switches?
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1315
I'm not sure how well they cope with video signal rates, but if you use
individual switches to form SPDT pairs, two IC's will be enough, and you
can control it with any SPDT toggle switch you like. You can get your
alternating control levels directly from a physical toggle switch. |
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| Lostgallifreyan |
| Posted: Sun Feb 11, 2007 11:22 am |
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Lostgallifreyan <no-one@nowhere.net> wrote in
news:Xns98D49BBF5F79Czoodlewurdle@140.99.99.130:
Quote: Maybe a pair of DG111 analog switches?
Meant DG211... |
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| Eeyore |
| Posted: Sun Feb 11, 2007 11:34 am |
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"no-spam2@lycos.com" wrote:
Quote: On Feb 11, 1:35 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
4 pole switches aren't very common. What load current and voltage are you
switching ?
It's just for video signals. I don't know the voltage/currents, but
I'm pretty sure it can't be more than 12V and a few mA. Any low
voltage switch should do.
Does it have to be a physical switch 4 pole ? How about a single pole switch of
your choice and some relays ?
Do you mean actual video or RF btw ?
Graham |
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| Eeyore |
| Posted: Sun Feb 11, 2007 11:36 am |
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Lostgallifreyan wrote:
Quote: Lostgallifreyan <no-one@nowhere.net> wrote
Maybe a pair of DG111 analog switches?
Meant DG211...
The channel resistance may be a bit high actually or I'd have suggested that
too. You could use discrete fets though.
Graham |
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| no-spam2@lycos.com |
| Posted: Sun Feb 11, 2007 1:24 pm |
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On Feb 11, 4:36 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
Quote: Lostgallifreyan wrote:
Lostgallifreyan <no-...@nowhere.net> wrote
Maybe a pair of DG111 analog switches?
Meant DG211...
The channel resistance may be a bit high actually or I'd have suggested that
too. You could use discrete fets though.
All of this sounds very good except I wouldn't know where to start :-(
My electronics knowledge restricts itself mainly to creating working
circuits out of schematics and other practical things. Not designing
stuff from scratch.
The circuit I'm working on in Eagle for creating a complete PCB is the
following diagram I found somewhere:
http://img236.imageshack.us/img236/2712/stmsyncvganl4.gif
It allows for a standard PC (VGA) monitor to be connected to an Atari
ST as opposed to just the special Atari monitor itself.
If the VGA monitor is a multisync type (e.g. it can handle all of the
Atari ST frequencies (*)) the switch can be used to choose colour or
mono modes.
(*)
Atari ST monochrome mode:
35.70 KHz horizontal
71.2 Hz vertical
Atari ST colour mode:
15.75 KHz horizontal
50/60 Hz vertical |
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| Lostgallifreyan |
| Posted: Sun Feb 11, 2007 4:12 pm |
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"no-spam2@lycos.com" <no-spam2@lycos.com> wrote in
news:1171214650.334020.40080@k78g2000cwa.googlegroups.com:
Quote: On Feb 11, 4:36 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
Lostgallifreyan wrote:
Lostgallifreyan <no-...@nowhere.net> wrote
Maybe a pair of DG111 analog switches?
Meant DG211...
The channel resistance may be a bit high actually or I'd have
suggested that too. You could use discrete fets though.
All of this sounds very good except I wouldn't know where to start :-(
My electronics knowledge restricts itself mainly to creating working
circuits out of schematics and other practical things. Not designing
stuff from scratch.
The circuit I'm working on in Eagle for creating a complete PCB is the
following diagram I found somewhere:
http://img236.imageshack.us/img236/2712/stmsyncvganl4.gif
It allows for a standard PC (VGA) monitor to be connected to an Atari
ST as opposed to just the special Atari monitor itself.
If the VGA monitor is a multisync type (e.g. it can handle all of the
Atari ST frequencies (*)) the switch can be used to choose colour or
mono modes.
(*)
Atari ST monochrome mode:
35.70 KHz horizontal
71.2 Hz vertical
Atari ST colour mode:
15.75 KHz horizontal
50/60 Hz vertical
Have a look at the DG211. Looks like you might be ok with two of those.
Eeyore mentioned that the on resistance might be a bit high, but as you're
using a circuit that uses 62 ohm resistors in three of the four lines, it
won't matter there. The 'monochrome sensor' line is probably a DC level
state line, so it won't matter there either.
If you can handle soldering and veroboard, you'll not have much trouble.
Just check VERY carefully before connecting to the computer's 5V supply.
The Analog switch IC's are very easy to use. The most awkward bit will just
be working out how you will route the connections. |
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| Lostgallifreyan |
| Posted: Sun Feb 11, 2007 4:15 pm |
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Just realised, you might need a 12V supply. That Atari plug appears to
provide one, which is helpful. The DG211 can work with 22V in some
versions, 12V should be safe for all. |
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| Andre Majorel |
| Posted: Tue Feb 20, 2007 12:51 pm |
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Guest
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On 2007-02-11, no-spam2@lycos.com <no-spam2@lycos.com> wrote:
Quote: It allows for a standard PC (VGA) monitor to be connected to an Atari
ST as opposed to just the special Atari monitor itself.
If the VGA monitor is a multisync type (e.g. it can handle all of the
Atari ST frequencies (*)) the switch can be used to choose colour or
mono modes.
(*)
Atari ST monochrome mode:
35.70 KHz horizontal
71.2 Hz vertical
Atari ST colour mode:
15.75 KHz horizontal
50/60 Hz vertical
Your VGA monitor can go down to 16 kHz horizontal sync ? Which
model is it ? I've never seen any that went below about 30 kHz.
--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
(Counterfeit: uryl@withy.com wasis@allison.com)
First rule of Usenet : if we don't have an answer, it's not a
good question. |
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| no-spam2@lycos.com |
| Posted: Wed Feb 21, 2007 2:37 pm |
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Guest
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On Feb 20, 11:51 pm, Andre Majorel <che...@halliburton.com> wrote:
Quote: On 2007-02-11, no-sp...@lycos.com <no-sp...@lycos.com> wrote:
It allows for a standard PC (VGA) monitor to be connected to an Atari
ST as opposed to just the special Atari monitor itself.
If the VGA monitor is a multisync type (e.g. it can handle all of the
Atari ST frequencies (*)) the switch can be used to choose colour or
mono modes.
Your VGA monitor can go down to 16 kHz horizontal sync ? Which
model is it ? I've never seen any that went below about 30 kHz.
Not a VGA monitor.
I was referring to Multisync monitors. I used to have an NEC Multisync
II which could handle all of the Atari ST's sync rates. |
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