I am trying to turn on a 12V LED, whenever power is applied to a 3.5V LED. I want to use a switch transistor instead of a relay. With the relay, 3.5V+/- on the switch activates 12V passthru; what switch transistor could I use to achieve this?
Great with old school (relay) but need the help of the pros here to use a transistor instead. Not sure that this will work, but I'm assuming it can. Any help or advice would be a great help.
The 12v LED uses 20mA (.24w ~ 1/4Watt) of power to run thru the transistor. Be a Newbie in the transistor world, what am I requiring for a transistor. Can 2 different voltages run thru a transistor, the same way it would with a solid state relay?
I was trying to light the 12v LED on a circuit that has an LED on it. When I connected it, I was extremely dim. Upon metering the circuit, I realized it was 3.5V. I have to run this 12v LED, so I'm trying to do this with a relay style of switch. I want to use a transistor, because I have been reading it's quicker switching and doesn't use much of the 3.5 draw to remain open, which the relay would do.
Help! not sure what to use or how to arrange this with a transistor.