Relay Switch

skewedToTheLeft

Hello,
I need to switch on and off a standard 110 volt light bulb. I know this can be done with a relay switch. I will be using a BS2 to control the relay. Can anyone recommend a relay switch that works with the BS2? A name and model and or link to one would be great.

Thanks,

JB

QuattroRS4

Or use an SSR ...
You should read this article .. contains all you need including part no.'s

www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol7/col/NV130.pdf

Regards,
John

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'Necessity is the mother of invention'

Those who can, do.Those who can’t, teach.

po2le

Try Radio Shack, if there is one close to you; they have various sizes of relays.· Some of them will fit a BS2 ckt. board.
Look at this: http://www.radioshack.com/search/index.jsp?kwCatId=&kw=relays&origkw=relays&sr=1

PO2L

erco

For better or worse, the Shack has a relay that will work for you. Check out http://www.radioshack.com/product/index.jsp?productId=2062480&cp=&sr=1&origkw=relays&kw=relays&parentPage=search·it's a 5V unit and can switch 1 amp at 125 VAC, so you can easily control a 60-75 watt light, even up to a 100W. The relay coil·draws 90 mA, so you'll need a small transistor between your stamp and relay. While you're at the Shack, get a multipack of transistors for $2.59 http://www.radioshack.com/product/index.jsp?productId=2062586&cp=&sr=1&origkw=npn+transistor&kw=npn+transistor&parentPage=search·and· and another value pack of rectifier diodes for $2.79 http://www.radioshack.com/product/index.jsp?productId=2062589&cp=&sr=1&origkw=diodes&kw=diodes&parentPage=search
and some 330 ohm resistors. Simple diagram attached.

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·"If you build it, they will come."

QuattroRS4

Basically the choice is yours .. a transistor and relay or just an SSR as outlined.

My opinion is to use an SSR in such scenarios ...for a number of reasons -galvanic isolation,Zero Cross over,low switching current - no need for extra components.No need for protection diode (to protect against back emf generated by inductive load switching) and it is solid state (no moving parts) .

Regards,
John Twomey

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'Necessity is the mother of invention'

Those who can, do.Those who can’t, teach.