• 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.


  1. sr13579

    How to charge my 9V battery with a no load 5V output?

    I am pretty much new with this adapter thing. I bought an adapter today with a 9 V rechargable battery. I tried my multimeter between the output and found something interesting. The output voltage is 5 volts on the 9V port. But when I am connecting the battery and turning the adapter on the...
  2. K

    Christmas Tree Fiberglass Illuminator and Color Wheel Rotator

    I hope someone can help me with this problem. I have an artificial Christmas tree with an Illuminator (single lightbulb) and Color Wheel Rotator which stopped working. I first thought it was the transformer/adapter, but after trying one from my laptop, I don't think it is the problem. I don't...

Latest threads

EE World Online Articles