• 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. A

    N-MOSFET as AC switch, triggered by DC (Hypothesis).

    Read about N-CHANNEL MOSFET’s. Gate and Base act as a capacitor; When gate reaches Threshold Voltage it allows current to flow from Drain to Source terminals by attracting negative charged electrons in between, constructing a conductive bridge. It is easy to select two oposite charges on DC...
  2. J

    SMD Electrolytic Capacitor: Decoding Capacitance & Voltage Rating

    I have an old accelerator board used in the PDS slot of an Apple Macintosh SE/30. The board was manufactured around 1994. I want to replace the electrolytic capacitors but I'm not sure how to decode the numbers printed on the caps. Here's a photo: As you can see the numbers are: 22 6 A...
  3. Gabriel Sá Pinto

    Measuring DC/DC Isolation Capacitance

    Hi there, I'm working on an EMC Control Plan for a product in my company and I'm trying to simplify all the testing processes as we're doing them in house. So there's one EMC that states the following: "Secondary power supplies generated by the equipment’s internal DC/DC converter shall respect...
  4. J

    Capacitance-Inductance meter without instruction manual. How I use it?

    I have bought a capacitance and inductance meter from a 2nd hand shop and there is not manual. So I don't know how to use it. I don't want to damage the device, so I have searched in the net and I have found some information about the mode 6243. My model is 6243+, so I attach some pictures and I...

Latest threads

EE World Online Articles