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Component help

 
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avo
Newbie


Joined: 26 Aug 2008
Posts: 3

PostPosted: Tue Aug 26, 2008 9:02 am    Post subject: Component help Reply with quote

Hi All

Im in search of a component but not sure what it would be called or refferenced.

Ok what i would like is and ic SMD version of a switch if i feed an input in

If its a high input say 2 - 5 v to switch one way and output a common or if i feed a low input in 0v to switch another way and output a different common.

Hope this makes sence

Help appriciated. Very Happy
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Tue Aug 26, 2008 11:37 am    Post subject: Re: Component help Reply with quote

avo wrote:
Hi All

Im in search of a component but not sure what it would be called or refferenced.

Ok what i would like is and ic SMD version of a switch if i feed an input in

If its a high input say 2 - 5 v to switch one way and output a common or if i feed a low input in 0v to switch another way and output a different common.

Hope this makes sence

Help appriciated. Very Happy


If your application will work with a silicone switch (not a physical switch) you could use a inverting buffer. You would have to do some searching for one that is inexpensive and available in the case style that you need.

http://pdf1.alldatasheet.com/datasheet-pdf/view/173180/FAIRCHILD/CD4050BC.html

You would feed your signal into one buffer (it's output would go low when the input is high)

You would then feed a second buffer, the second buffers output would feed the input of a third buffer. The output of the third buffer will go low when the input goes low.

Depending on the device the high/low and low/high transition will occur at different places.
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avo
Newbie


Joined: 26 Aug 2008
Posts: 3

PostPosted: Tue Aug 26, 2008 11:40 am    Post subject: Reply with quote

Thank you for your reply

But i think im explaning it incorrect i will post a picture
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avo
Newbie


Joined: 26 Aug 2008
Posts: 3

PostPosted: Tue Aug 26, 2008 11:52 am    Post subject: Reply with quote

Hi

Ive drawed a image but unable to upload it

Ok i will try again

1 input
1 output
2 commons

1 common is say 3v (common a)
1 common is 0v (common b)

when i apply 0v to the input then the ouput will be switched and output 0v
When i apply 3v to the input then the output will be switched and output 3v

Thank you.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Tue Aug 26, 2008 5:44 pm    Post subject: Reply with quote

avo wrote:

1 common is say 3v (common a)
1 common is 0v (common b)


I don't understand what you mean by common. If you explain what the output will be powering I may be able to envision how it needs to operate.

The circuit I described would provide either a positive or negative output that would change depending on the input state (high or low).
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