Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
You need to better explain what you are trying to do?
Overall, yes depending on your application. Use a small switching transistor to drive a relay or larger transistor but again this is vague as you don't provide any information. How much current do you have available on your 3 volt source (as in where does it come from) and how much current at 12 volts are you looking to switch?
The easy answer is to use a opto coupler, bacisally it consists of a led on the 3 volt side and a photo transistor on the 12 volt side isolated by a beam of light all in a single package.
As Reloadron asked we need to know more data to give advice to exactly what will suit your circuit needs.
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