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using a transistor in place of a relay?


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KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: May 27, 2009 at 7:06 AM / IP Logged  
reactor wrote:

Hi, i'm new at posting here but have been reading this forum for some time. I have a very related question may be someone can answer.

I need to provide positive power to the LED light (0.05Amp draw-very low current), but the control wire i have available is a ground signal. So i want use ground to switch the transistor On and Off. Can i use same wiring diagram posted above for wiring the transistor exept the ground will not be permanet but switched? Is it OK for the transistor to have constant power supplied to and will it work properly by having ground turned On and Off?

I'm planning to use same pn# as posted above since it will be running much lesser current than needed for relay coil.

Thanks.

You really should start a new thread for this - but the simple answer is why can't you just reverse the connections on the LED?  That would be the easiest way I would think.  If, for some reason, that isn't possible then a transistor would work. 

Kevin Pierson
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