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pulsing light


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I'm looking for a circuit to pulse (well slowly fade up and down rather than flash) a 12v 50w lamp. I have looked at all the usual suspects for a circuit ( maplin, quazar electronicsetc) to no avail. Does anybody have a suggestion where I might find one. I have thought about a 12v motor controller, but that means that you still have to turn a pot up and down.


Thanks in advance.




Ps. If you want to know it's for a pulsating pumpkin for cinderella. Panto commeth....

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