Successful current relay diagram for High-Risk Applications
Reliable current relay diagram Designs for Commercial and Industrial Applications
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poopee_dogg asked How to drive 12 volt relay with 1.30 volt input?
I'm planning to remotely switch my lights using my cellphone. I will use the connection of the vibrator of the cellphone which outputs 1.30 volts to drive a relay. I know the basic diagram for a NPN transistor driving a relay. But I don't know what resistor and transistor to use. Thank you. Using 2N3904 transistor, what resistor should I use?
And got the following answer:
Simple. Amplify the 1.3 volts to 12V and voila! I would take the output of the cell phone's 1.3V and tie it to a 100 ohm resistor to the base of an 2n2222 transistor, which should be able to handle a small 12v relay. The emitter should be grounded, as well as the cell phone to a common ground, and the relay should go from the collector of the 2N2222 and then to 12-15V. That will do it! When the input goes to 1.3V, the transistor will turn on, pulling down the collector and provide current to the coils. There is a potential problem. The 1.3 v may not provide enough current to the base of the 2N2222. So you may have to tie directly to the base without the resistor. I would have to experiment.
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