DIY Over Current Protection(Protect Your Sensitive Circuits)

About: I am a electronics hobbyist from india. Youcan visit my youtube channel "AviPrink" for more detailed information.

Intro: DIY Over Current Protection(Protect Your Sensitive Circuits)

Hyy Friends most of our electronics circuits fail to work and draws more current from power supply/Battery and burns due to high current flow, Today we make a over current protection circuit to protect our test circuit.

Step 1: Video

Watch Video For more info

Step 2: Schematic

Assemble all components according to circuit diagram.

Step 3: Grab All Parts

  1. 1x LM358 Duel Channel Op-Amp
  2. 0.5 Ohm 10 Watt Resistor.
  3. DPDT Relay
  4. Red LED (5mm)
  5. 2x 20 K Ohm Resistor
  6. 6x 1 K Ohm Resistor.
  7. 10 K Ohm - 100 K Ohm Pot.
  8. 1N 4148 Diode.
  9. 2x BC547
  10. Tectile Switch

Step 4: All Done

Enjoy Your Build.

Thank You

You can also visit my Channel for more projects

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    5 Discussions

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    B0nkers

    3 months ago

    Sorry to criticise, but the LM358 input common-mode range does not extend to the positive rail. It falls short by a volt or so, 1.7V in the worst case. High-side current sensing (as you are doing) requires a RRI, or RRIO op-amp (rail-to-rail input needed). - there are other approaches, like "potting down the rail and the sense resistor connection" so it lies within the input CMR common-mode range. But this approach is hard to tolerance.

    2 replies
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    AviPrinkB0nkers

    Reply 3 months ago

    Yes i agree with you, but it works for me. I also have designed low side current sensing. It also works fine for me

    IMG-20180619-WA0032.jpg
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    AviPrinkAviPrink

    Reply 3 months ago

    You need to cunnect pin 4 before shunt
    Not after as little mistake in my diagram

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    MissionCritical

    Question 3 months ago

    Hey there, I really found this project interesting, would to like to share a little detail about specifications of this project like input current, current limit factor etc, thank you in advance

    1 more answer
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    AviPrinkMissionCritical

    Answer 3 months ago

    current capacity is depends on relay. use powerful relay for high current capacity.