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.
I have a Belkin phone charger and I have noticed that every time I disconnect the phone, It makes a series of strange noises, a high pitched one, a low pitched one and then it continues making a high pitched sound. I know that the transformer is making these sounds but, why does it make that...
I will admit from the git-go that i am almost totally electronically illiterate. So please factor that into any responce.
Here is what i am trying to accomplish. I would like to use a toy steam engine dynamo to power a USB port for the purpose of charging phones etc.
Here is a link to a...
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