I'm designing a device for my senior EE project that is a cell phone that can turn a lamp on in your house if you away from home. The project is to deter home break ins, and the thought is to be able to call the cell phone to activate a switch to turn on a lamp. My thought was to have a DC interchangable power source and when the call came in, have the small (about 300mV) signal latch an SCR to a lamp. However this circuit is causing me some trouble because i cant get it to work consistantly in Multisim.
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