You can't light a blue LED with a 1.2 volt rechargeable battery - or can you? In this circuit, not only is the battery voltage insufficient to overcome the LED's forward voltage, but the LED is connected the wrong way round.
But an inductor fixes both problems by generating a high reverse polarity voltage when the battery is disconnected.

By Julian

Youtuber, shed dweller, solar charge controller aficionado

12 thoughts on “Inductor tutorial – how to boost voltage and switch polarity”
  1. Avataaar/Circle Created with python_avatars Seckin Seckin says:

    I put one coil between wires and increased frequency with frequency generator..when i adjust higher frequency in multimeter i saw voltage becomes lower . i researched it it called "inductive reactance" this phenomena decreases this voltage because resistance gettin higher. In boost converters when you increase the frequency then voltage also increases because diode and capacitor prevents this reverse polarity (this inductive reactance).. so switchin coil fast enough without any components makes voltage drops actually but switchin coil with diode and capacitor you can keep voltage higher..

  2. Avataaar/Circle Created with python_avatars Surging Circuits says:

    Yep. Basic step/up booster approach with you being the transistor?

  3. Avataaar/Circle Created with python_avatars arjunyg says:

    theres no proof that this battery is insufficient lol…you never connected it the right way…

  4. Avataaar/Circle Created with python_avatars Silver Legend says:

    A single cell is not a battery!

  5. Avataaar/Circle Created with python_avatars Zaki Reyansyah says:

    idiots

  6. Avataaar/Circle Created with python_avatars Suraj Grewal says:

    I've lit up a neon bulb with only a relay and a 9v battery

  7. Avataaar/Circle Created with python_avatars Blank. says:

    So… Basicly you replaced the supressor diode with a load and the load runs off the backflow current…? 😀

  8. Avataaar/Circle Created with python_avatars redtails says:

    Could have said a bit more on inductor workings, on magnetic field to electric current and vice versa, but alas

  9. Avataaar/Circle Created with python_avatars honda4004 says:

    Hi have you ever tried mixing 2charged opposite liquids view joe cell horses mouth as it explains I believe he has used urine in the cooling system of the engine which through evaporation vacuum coats a lithium crystal coating inside all the engine does this add up to you as I have been told be then carries out something called phasing out appreciate reply as you will see I am trying to get an engine running on atom stripped opposite magnetic attraction repulsion

  10. Avataaar/Circle Created with python_avatars irvinhidalgo says:

    nice video sir. what is the value of the inductor you are using?

  11. Avataaar/Circle Created with python_avatars Raymond Earle says:

    Great tutorial Julian. Thank you.

  12. Avataaar/Circle Created with python_avatars omsonic says:

    google jewel thief circuit

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