12V solid state relay chips?
henry99
Posts: 67
Are there any simple 12V solid state relay chips around to interface to a BS?
I just want to make a +5V high on trigger switch that has 12V hooked up to it.
I was thinking about designing a FET circuit but figure this must be a common design that someone has wrapped into an easy to use IC. Thanks for any leads!
I just want to make a +5V high on trigger switch that has 12V hooked up to it.
I was thinking about designing a FET circuit but figure this must be a common design that someone has wrapped into an easy to use IC. Thanks for any leads!
Comments
I use this Futurlec Solid State Relay to control a 12vdc, 24 amp battery source using a single Stamp pin . . .
Futurlec SSR
It works very well for me and has been for a long time.
--Bill
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You are what you write.
I do not use a diode.
Where there is no "coil", no current can be generated. However, I am the world's worst when it comes to electronics. I totally rely on the folks on this forum and have learned quite a bit from them.
(A "coil" could be a single wire passing from one pole of a magnet to the other.)
In any case, the SSR I use works perfectly and was recommended to me by forum member Mike Green.
--Bill
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You are what you write.
PS.. A rule of thumb people use around here is if Mike Gree says it will work, it will work. He has helped all of us out many times on this forum and has an extream knowledge of the basic stamp and the electronics to go with it...
That is exactly how I have my SSR set up. There is hardly anything at all to making one of those things work. A HIGH x (where x is a pin) turns it on and a LOW x turns it off.
I certainly appreciated Mike's help months ago when he suggested it. However, at times he actually wants me to think for myself. Hey! What's up with that? Anyway?
--Bill
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You are what you write.
Maybe I'm missing something obvious. It wouldn't be the first time.
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I'm not a complete idiot! Some of my parts are missing.
I am not trying to be facetious.
An advantage to me is that the SSR has four connections, each one clearly labeled. Another advantage is that it will handle up to 40 amps and is very easy to mount.
I only know what "MOSFET" stands for; I do not know anything about their use. Will they commonly handle 40 amps? Are they dirt-simple to mount? (2 screws on the SSR.) I would appreciate knowing. Maybe the next time I will use a MOSFET.
--Bill
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You are what you write.
You can certainly use a MOSFET to build something similar but you may also want to add an opto-isolator to protect the Stamp. There is more than just a MOSFET inside the module. The page describing the SSR mentions that it is optically isolated. That is a nice feature. Without that if you have some sort of failure that toasts you MOSFET and shorts it then you run the risk of dumping the load voltage back through your Stamp pin. Not a good thing. When it is optically isolated there isn't a physical wired connection so the stamp pin won't be damaged.
It is possible to build your own and you can save a little but these type of modules do work well and are easy to use. Everything is in a neat tidy package.
Robert
I'm not a really an electronics person.It's just that these types of circuits are simple to construct.
As for using MOSFETs. There is nothing more simple or economical. Decide how much current you want to control. Then just select the right value. If you want,you can even double them up to increase the amount of current you·can control. Just remember to use heat sinks on your mosfets.A MOSFET,is a special type of transistor so go to the web and google MOSFET. A lot of info will come up. Very interesting stuff!
Ken
-Phil
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'Still some PropSTICK Kit bare PCBs left!
Post Edited (HIBITDAC) : 7/20/2008 3:56:32 PM GMT