Circuit/relay that senses when ac appliance is in use Answered
I am attempting to add some ambient lighting to my home theater system. I would like the lighting to activate whenever the tv or receiver are switched on (these units are always on together).
I am a novice tinkerer, who is capable of soldering and simple circuit design, but I am having trouble finding a way to activate the lights without opening (read: voiding the warranty) my receiver or television.
What would be the easiest way to accomplish this?
A few of my unformed ideas would be:
-A relay that could sense when a/c power is being consumed (aka, receiver/tv being switched on)
-Would some sort of hall effect sensor accomplish the above?
I'm just not really sure how to tackle this one, any suggestions are appreciated. My project priorities are (in order): 1) ease/simplicity of design, 2) the smaller the component size the better, 3) cost
I'm not sure if this helps, but this item came to mind, a Small Engine Hour Meter http://www.buy.com/pr/product.aspx?sku=226358043&sellerid=24561471 This item can sense the current to the spark plugs without a physical wire connection. (induction?) I know that item is intended for dc use, but could one be adapted to AC? Or does anyone know if the relatively low dc voltage signal to my speakers could be used to activate a product like this? TIA