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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.
And got the following answer:
In this instance I would use a op amp to increase gain and provide isolation for the phone. Then use a NPN to switch the relay. I would advise against this however, manufactures have tried to make this type of device before and feedback, noise caused issues. However there are tactile devices that detect the phone itself vibrating, which effectively isolates it from wall current (sans the makers charger). Much easier and safer, plus this solution won't void your warranty.