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.

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


    8 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

    Reply 8 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


    Reply 8 months ago

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


    Question 8 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 answer

    Answer 8 months ago

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