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  • 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.

ac-dc

  1. mading2018

    Implement PFC controller properly to AC/DC converter

    I am trying to implement a PFC controller to AC/DC converter stage, but I have some problems to get the current feedback correctly so the output is more steady state. Also, the waveform have transients in the beginning, it is possible to reduce these transients? I have connected a transistor...
  2. sr13579

    What is wrong with my transformer output?

    The thing is, I was trying to regulate a 220V-9V to 5 volt. I did it though. Everything was right.I was trying to make a dark sensor with NOT gate () The settings are good. But it wasn't working fine with the AC to DC adapter.( It is working fine with a battery like the video). The thing is...
  3. P

    Amplifying AC voltage via DC supply voltage

    Hi all, at the moment I'm trying to amplify an AUX-Signal with a 12V DC supply voltage. I tried die setup from here as u can see in the picture below. But all I get is just an annoying noise sounding horrible. For the amplifier I used both the CA3240EZ and the OPA134PA. Maybe my grounds are...
  4. A

    Help! Reading Voltage with Arduino

    Hi guys! I'm trying to build a device to measure the electrical resistivity of a paste (cementitious materials) using Arduino Uno. Four steel probes are put inside the paste (jumper wires attached to them). Two outer probes apply AC signals (Square wave signals- Frequency 1 kHz- Voltage(peak to...
  5. riccardo

    AC-DC PSU 15V, 2A - Where to buy a compact module?

    Hi, Does anyone know of something to convert 240V mains to 15V DC at upto 2A? I want it to be as compact as possible. I've been looking for PCB mounted modules but the price and size of them seems ridiculous. For example; Farnell sell a VTX-214-030-115 for £20. You can buy a whole bench PSU...

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