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Transistors to switch leds on/off


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recognition 
Member - Posts: 3
Member spacespace
Joined: February 08, 2006
Location: United Kingdom
Posted: February 10, 2006 at 11:27 AM / IP Logged  

Cool! thanks for your help!

Been using relays but I want a much smaller, quieter set-up.

This should get me started well!

Cheers!

AZ-ss 
Member - Posts: 31
Member spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: January 22, 2004
Location: United States
Posted: February 20, 2006 at 6:11 PM / IP Logged  

I have a question about using transistors instead of relays.

My example is- I have a switching (positive or negative) source for a circuit that is aprox. 3 volts and I would like to control a positive source of 12+ volts.

I think I understand that the Collector and Emitter would bear the 12volt end of the circuit and the Base would be the 3 volt switcher. (correct?)

Now, Should the base be opposite polarity of the Collec. and emitter?

And if the base receives a variance of voltage does it affect the volatge being passed from collector and emitter? (such as a dimmer circuit)

Thanks!

ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: February 21, 2006 at 4:05 PM / IP Logged  
Basically correct. Easiest method would be an NPN transistor:
Emitter- ground
Collector- ground lead from device
Base- 3 volt switching signal-> recommened to use a resistor
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