LTSpice Switches missing

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LukeeeeBennett

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I've decided to convert from Yenka to LTSpice as Yenka can't keep up with large circuits. But, a lot of fundamental components aren't in the LTSpice library's. Like, simple switches. No SPST, DPST. Nothing.

Any ideas why?
 
LukeeeeBennett said:
I've decided to convert from Yenka to LTSpice as Yenka can't keep up with large circuits. But, a lot of fundamental components aren't in the LTSpice library's. Like, simple switches. No SPST, DPST. Nothing.

Any ideas why?
Click to expand...

hi,
Yahoo LTS group has switch models.

EDIT:
 

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There are swtiches in LTspice. The are kinda funky, because they have a voltage "in" port that switches the contacts with a threashold voltage. I think it's under the "components" library. I'll have to look when I get back home and double check, but I know they are available.

If nobody else beast me to it, I'll post an example circuit that uses LTS switches.
 
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LukeeeeBennett said:
Yah, I found them. No sign of DPST switches though. Oh well.
Click to expand...

You can simulate a DPST switch using the swtiches provided in LTSpice. It can get kind of messy, but you can hide the details in a custom component.

Or jsut use realys as Mr EG suggests.
 
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Here's a schematic that uses a switch in LTSpice. You have to chose the switch from "components/sw" and use the .model statement as shown to define the switche's characteristics. You can simulate any switch by connecting the sw primative in various configurations, and as I said, hiding the details in a custom symbol.
 

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I have used two spst switches as a spdt switch. I wire the inputs together so they get the same voltage. In the .model statement I set one switch to have an on resistance of 1 ohm and an off resistance of 10,000,000 ohms. The other switch has a on resistance of 10,000,000 and an off resistance of 1 ohm. This causes the two switches to act opposite to each other.
 
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