Testing circuits I found on the Internet: Inverter! It does work, BUT…



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http://www.learningaboutelectronics.com/Articles/Power-inverter-circuit.php

In this episode of “Testing circuits I found on the Internet”, I will be having a look at a popular inverter schematic I found on google images. The design uses an astable multivibrator in order to pull current alternately through a transformer and thus create a high AC voltage on its output side. A lot of DIY inverters use this functional principle. That is why I will build up the schematic, properly test the circuit and show you what problems it comes with that you can more or less easily fix. Let’s get started!

Thanks to Brilliant.org for sponsoring this video.

Music:
2011 Lookalike by Bartlebeats

0:00 The schematic I found on the internet
1:06 Intro
2:09 Building up the circuit
3:13 Initial test
4:23 How the circuit works
7:32 Problem 1: Feedback
8:45 Problem 2: Overvoltage at the MOSFETs
9:20 Problem 3: Overvoltage at the Transformer
10:11 Other problems (lots of them)
10:42 Verdict

source

27 thoughts on “Testing circuits I found on the Internet: Inverter! It does work, BUT…

  • May 16, 2021 at 5:35 pm
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    "but you're not reasonable, and want to save money" lmao i love this guy

    Reply
  • May 16, 2021 at 5:35 pm
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    I don't know as much about electronics as you do, but when we both read "astable multi vibrator produces a near sinusoidal waveform" I must admit I laughed.

    Reply
  • May 16, 2021 at 5:35 pm
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    Suggestion:

    Joule thief circuits. For some reason I can never get smd/smt versions to work.

    The classic one where you just tie everything into a little ball seems to work, but never the nice looking, super tiny smd/smt ones

    ┐( ˘_˘)┌

    Reply
  • May 16, 2021 at 5:35 pm
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    Waiting for the "Build your own Pi" video and hoping that it's the pi 4.

    Reply
  • May 16, 2021 at 5:35 pm
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    As usual, excellent job ! Now question is, did you contact the web site to make them remove this dangerous circuit ?

    Reply
  • May 16, 2021 at 5:35 pm
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    I've had a person argue with me that a RaspberryPi 240Vac relay add-on card he was demonstrating did not need an insulator sheet because there were no mains voltages present that could damage the Pi. The mains relays were through hole parts with exposed 240Vac pins.

    Reply
  • May 16, 2021 at 5:35 pm
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    12V -> 220V -> 5V -> 4.2V. It is crazy, this world is crazy. All this unification via USB, created from mains, no matter what.

    Reply
  • May 16, 2021 at 5:35 pm
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    Dude, all I hear from you is all the gasp between sentences. It's really distracting, there's a program called Audacity. I think it would be rather easy for you to remove all your gasps using that.

    Reply
  • May 16, 2021 at 5:35 pm
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    Make the simplest arduino nano SPWM inverter with optocoupler voltage feedback stabilization and from a rewinded MOT transformer (discard the HV winding, and rewind a primary center tap). How much power can it deliver at the output?

    Reply
  • May 16, 2021 at 5:35 pm
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    For 40 dollars you can buy a proper 12V DC to 230V AC inverter. Most od electronic gadgets run internally on DC, so a buck/boost converter is more suitable way to power them up.
    Stil for 40$ you cannot get or build fully sinusoidalnego inverter, so you cannot use it with AC motors.
    But you can invest 40$ in educational electronic kit for you or tour children, so they can earń for a proper inverter and other cool stuff in the future.

    Reply
  • May 16, 2021 at 5:35 pm
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    Noice series

    This is what we novice diy noobs need
    Thank you very much

    Reply

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