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You are here: Home / 555 IC Circuits / How to Make Simple Boost Converter Circuits

How to Make Simple Boost Converter Circuits

Last Updated on February 23, 2020 by Swagatam 72 Comments

A couple of simple boost converter circuts are explained in this post, whch can be build and applied by any hobbyists for their own specific requiremenet.

What is a Boost Converter

A boost converter circuit is a design intended for stepping-up or boosting a small input voltage levels to a desired higher output voltage level, hence the name "boost" converter.

Although a boost converter circuit may involve many complex stages and calculations, here we will see how the same could be built using minimum number of components, and with effective results.

Basically a boost converter works by oscillating current though a coil or inductor, wherein the voltage induced in the inductor is transformed into a boosted voltage whose magnitude is dependent on the number of turns and PWM of the oscillation frequency.

Simple Boost Converter using a single BJT

simple boost converter circuit using BJT

Parts List

R1 = 1K 1/4 watt

D1 = 1N4148 or a Schottky diode such as FR107 or BA159

T1 = any NPN power BJT such as TIP31, 2N2222, 8050 or BC139 (on heatsink)

C1 = 0.0047uF

C2 = 1000uF/25V

Inductor = 20 turns each of super enameled copper wire on a ferrite torroid T13. Wire thickness can be as per the output current requirement.

1.5V to 30V Converter

In the above design a single BJT and an inductor is all that's needed for visualizing an incredible 1.5V to upto 30V boost.

The circuit works using a joule thief concept and utilizes an inductor in the flyback mode for generating the specified high efficiency output .

Using a flyback concepts allows the two side of the transformer isolated and ensures better efficiency, since the load is able to operate during the OFF time of the BJT, which in turn prevents the BJT from overloading.

While experimenting I found that adding C1 drastically improved the performance of the circuit, without this capacitor the output current did not look too impressive.

3.7V to 24V Converter

A simple boost converter circuit can be also built using an IC 555 circuit for boosting USB 5V to 24V, or any other desired level. The same design can be used for boosting a 3.7V to 24V from a Li-Ion cell.

555 boost converter circuit

The above circuit can be regulated with a feedback as shown below:

The idea looks quite straightforward. IC 555 is configured as an astable multivibrator whose frequency is decided by the values of resistors and capacitor at pin#7 and pin#6/2.

This frequency is applied to the base of a driver transistor TIP31 (incorrectly shown as BD31). The transistor oscillates at the same frequency and forces supply current to oscillate within the connected inductor with the same frequency. The selected frequency saturates the coil and boosts the voltage across it to a greater amplitude which is measured to be around 24V. This value can be tweaked to even higher levels by modifying the turns of the inductor and the frequency of the IC .

Video Links for the above boost converter circuits are provided below:




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Next: Ultrasonic Wireless Water Level Indicator – Solar Powered

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

You'll also like:

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  • 2.  Photodiode, Phototransistor – Working and Application Circuits
  • 3.  8X Overunity from Joule Thief – Proven Design
  • 4.  IC 555 Pinouts, Astable, Monostable, Bistable Circuits with Formulas Explored
  • 5.  Basic Electronic Circuits Explained – Beginner’s Guide to Electronics
  • 6.  Easy Two Transistor Projects for School Students

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  1. Search Related Posts for Commenting

  2. Vernon Tritchka says

    Mr. Swagatam
    I like your “simple boost circuit. I appreciate your response, the 12 v laptop charger circuit, I’ll study it. I find now that we need to get up to approx. 200 volts output from 9 volts input. I still need a bit of couching. Thanks again. Vernon

    Reply
    • Swagatam says

      You are welcome Mr. Vernon!
      For higher voltages you can using a small 9-0-9V 220V 100mA transformer, and use it in place of the inductor shown in the IC 555 circuit. This is hopefully help to accomplish the required results quickly!

      Reply
  3. Vernon Tritchka says

    Good morning
    Working on a project that includes “boosting” 9v DC (battery) to 50 to 100v DC.
    We’re not sure of the circuit design or components. We want it to be able to recharge for follow on use. (all going in a small package).
    Have you done such a project that you could permit us to reference?
    We appreciate the assistance.

    Reply
    • Swagatam says

      Hello, you can try the first concept presented in the following article:

      https://www.homemade-circuits.com/12v-car-laptop-charger-circuit-using/

      Reply
  4. rudi says

    Mr Swagatam, I was still wrong in wrapping the enameled wire on the toroid, could you give an example in the form of a picture, but not a symbol

    Reply
    • Swagatam says

      Mr.Rudi, the winding is not critical at all. Just wind the two sides anyway you want, and after connecting it to the circuit if the circuit doesn’t work, just interchange the wire ends of any one of the winding, and your circuit will start working instantly.

      Reply
    • Eroka says

      Good evening sir,pls I we like to learn more on dis DC 1.5 converter to DC 12 voit

      Reply
  5. Ordu Prudence says

    Good day sir please for the first diagram I can’t really find a 1000uf capacitor and also the 0.0045uf
    So can I try using 220uf and 22uf

    Reply
    • Swagatam says

      Ordu, 1000uF can be replaced with 220uF, but the 0.0047uF value cannot be altered, you can adjust the value through series parallel capacitors if required.

      Reply
  6. Andrew says

    Please is there any other pwm oscillator ic I can use instead of 555 or can I equally use the popular viper22A or Rm6203 used for flyback converters, will it work.

    Reply
    • Swagatam says

      You can use TL494 IC or similar, but VIPER can be difficult since it is configured to work with high voltage rectified AC.

      Reply
      • Andrew says

        Ok I’ve just made the circuit, and am continuously having this problem of magnetostriction. According to my research, I find out that it is due to low frequency switching. So please can you tell me how I increase the switching frequency, and also the factors and components value that affect the frequency of operation.

        Reply
        • Swagatam says

          If you are referring to TL494 circuit, you can change its Rt, or Ct values to change its frequency.

          Reply
          • Andrew says

            No it’s the first version of the joule thief circuit.

            Reply
            • Swagatam says

              Did you confirm the frequency with an oscilloscope? Since it’s a self oscillatory type circuit frequency is pretty much fixed. For higher frequency you can probably try the following version:

              8X Overunity from Joule Thief – Proven Design

  7. Miracletech says

    Dear sir Swag, truly you have swag! I have been looking for this information for years but thanks to you I found it! Also, can the resistor be added after the toroidal core? Like directly at the base of the transistor?

    Reply
    • Swagatam says

      Thank you Miracletech, yes you can try that for the first diagram. For more options you can also refer to this article:

      https://www.homemade-circuits.com/1-watt-led-driver-using-joule-thief/

      Reply
      • miracletech says

        Ok. Thank you so much.

        Reply
  8. Hassan Khan says

    can we use this circuit(555) to boost voltage from solar panel (12v to 15v)?

    Reply
    • Swagatam says

      yes, it is possible.

      Reply
  9. BERNARD TENDENGU says

    Dear Swag,
    I do have a 12volt @75 amp dc battery and do intend to use to power about five led corn light bulbs and rating for each is 359 milliamps and wattage for each is 26 watts. I will be using the constant current method to drive the led driver to power the lead lights. The led driver can be a buck boost converter, sepic dc dc converter or cuk dc dc converter. The problem I am having is that of stepping down the high dc current from 75 amps to manageable one like say 13 amps. If it were ac it would be easier. What I am requesting from you is a general method which I can apply.

    Reply
    • Swagatam says

      Dear Bernard, what is the voltage spec of the LED, there’s no need of a buck boost circuit, you can directly use the supply for the LEDs after configuring the LEDs appropriately.

      Reply
  10. marcelo says

    Good evening sir,
    very difficult to leave your pages. Your information is always precious.
    Transistors in Darligton mode would lift me the current in these joule thief if powered by solar cell?
    If not, is there any other way to get a current gain?
    If it were a buck converter would there be a way to take advantage of the current of the dissipated voltage?
    Thank you very much in advance.
    A lot of Swag light

    Reply
    • Swagatam says

      Thank you Marcelo, appreciate your interest very much!

      A Darlington may help to increase the current transfer response. However, using many thin wires together for the winding may also help to gain more power from the design. A joule will normally work like a boost converter so not sure how it may be turned into a buck converter…but I don’t think this concept can be used effectively used for charging bigger batteries.

      Reply
  11. Parsiva says

    Hello sir
    For giving the gate pulse to the BJt can i give it through Arduino?
    like pwm technique

    Reply
    • Swagatam says

      Hi Parsiva, you can do that, just make sure that the duty cycle and the frequency are optimally adjusted.

      Reply
  12. faith jumbo says

    Goodday sir I really want to appreciate you for good work thank you very much please keep up

    Sir please I build a boost converter using 555 timer to drive my mosfet, and I use a mosfet in place of the transistor but each time I power it up the mosfet get really hot please what could be the cause I have checked but can find any fault in the circuit

    Reply
    • Swagatam says

      Hello faith, keep the frequency at around 50 kHz, and test by gradually increasing the turns until the MOSFET stops heating, this is perhaps the easiest trial and error way to optimize a boost converter.

      Reply
      • Faith says

        Which turns is it the number of turns i.e the inductor

        Reply
        • Swagatam says

          There’s only one component in 555 circuit which has turns, it’s L1

          Reply
          • Faith says

            Sir I have seen my mistake all this while the diode was connected wrongly but now is working very well thanks for your assistance

            Reply
            • Swagatam says

              Glad you could solve it!

    • Faith says

      Sir I did exactly what you said it still the same I noticed that when ever I connect the power supply it like both positive and negative are connected together it al hiways spark and if I try leave it for some second the wire Wil burnt out but if i remove the inductor it will not happen, and the output power is not boost please what could be the cause. The inductor I’m using is wound on a toroid core

      Reply
      • Swagatam says

        How many turns did you use? and what at what frequency did you set your IC 555?

        Reply
        • Faith says

          Sir I’m really confused here, I even try building the boost without the 555, i.e the simple circuit were I have just inductor, diode pull button switch and capacitor, when ever I pushed the switch the inductor Wil connect it to ground i.e shorting the circuit why this happening

          Reply
          • Swagatam says

            The switching should be in millisconds, if you hold it even for 0.25 seconds it will create a short circuit. You can read the following article for more info:

            https://www.homemade-circuits.com/how-boost-converters-works/

            Reply
  13. damilare says

    sir I made this circuit but its not working I can’t find 680pf but am using 2A682k then I cant get tip31 and am using tip41 while testing it its just sparking as if I shot the circuit of the battery then the transistor is getting hot please help me

    Reply
    • Swagatam says

      damilare, 2A682k = 6800pf, it’s not 680pF

      In your present set up increasing the number of turns to 5 times more than the shown value, and check the results. Wind it on a ferrite rod.

      Reply
  14. adofo says

    adofo I have 5v 500ma solar panel. can I use your booster convert to run car tape

    Reply
    • Swagatam says

      5 x 0.5 = 2.5 watts that’s too less for a car tape, it won’t work

      Reply
  15. Paul says

    Hello,

    Sir can i use N-channel mosfet instead of transistor? for T1 & BC547?
    is there any modifications for this?
    Thanks a lot..

    Reply
    • Swagatam says

      Hello Paul, mosfets will require minimum 9V to turn ON fully, so it cannot be in these applications.

      Reply
      • Paul says

        Thanks for the reply then can i use 13003 transistor for T1?

        Reply
        • Swagatam says

          I am sorry Paul, for BC547 you can use a mosfet since the gate would be receiving a boosted 12V so no problem.. MJE13003 won’t be suitable here!

          Reply
          • Paul says

            I cant find any TIP31 Its hard to find here in our place but i found TIP41 & TIP42, can it be used here in the circuit ?
            Thanks…

            Reply
            • Swagatam says

              TIP41 is fine, it will work…

            • Paul says

              Sir Can I use 100nf cap instead of 680 pf? i cant find that capacitor.. and 1n4007 diode instead of FR107.
              thanks again..

            • Swagatam says

              Hi Paul, There’s a huge difference between 100nF and 680pF, so it won’t work. You can try the first circuit instead.

          • John Smith says

            Hmm, if Paul been asking about replacing T1 BJT with 13003 it would probably work, since 1300x family is just (high-voltage) NPN BJTs, not anyhow worse than any others. They are pretty typical in CCFLs and dumbest “electronic transformers”, esp these for “halogen lamps” and even some cheap SMPS designs.

            Reply
            • Swagatam says

              It will work but with poor efficiency, that’s the reason we have such a huge range of devices designed for different voltage or current specs, otherwise the manufactures could have designed a single all purpose 1kv transistor : )

            • John Smith says

              Yes, but if one goes for joule thief or 555-driven circuit, especially with BJT as switch and FR107 as diode, they don’t have to expect superb efficiency or awesome output power in compact package, right?

              This said, joule thief is funny thing to power small led or so out of 1.5 volt battery. Only few relatively exotic and expensive DC-DC ICs would start up from voltages that make “joule thief” happy.

            • Swagatam says

              Actually a joule thief circuit is supposed to be extremely efficient, that’s why it’s called a “joule thief”. Yes, it’s been one of the most interesting inventions so far, considering the fact that it can work even with voltages lower then 0.5 V.

            • John Smith says

              Joule thief key property that makes it interesting is that it runs down to like 0.3V or so, draining 1.5V batteries way below what most of other electronics could afford. Say, most CMOS-based ICs have a problem that 0.3V is way below of threshold voltage. Even “special” boost ICs like NCP1400 would start up from like 0.8V – then it would hold down to like 0.3V as well – because they start up, and then supply self out of own boosted output. However it implies startup problems if battery got below 0.8V and “cold” start happens.

              This said, joule thief is kind of “blocking oscillator” – so it got no reasons to be terribly efficient. Waveforms aren’t really perfect, BJT drops some tenths of volt on C-E junction even if current is small, etc (FETs get edge in this regard generally, but most MOSFETs got threshold over 1V, so running less than 1V is a problem, lowest I know have Vg_th=0.8V). However joule thief gets its edge over many other circuits when it comes to using 1.5V batteries, draining them way more completely compared to most other circuits. So it would start and work out of batteries most equipment considers long “dead”. That’s where it gets extra power margin – partially negating its imperfections, so overall performance looks rather good.

              p.s. I’ve finally got right one of these 10-year-led-blink, without getting it working I would have felt ashamed way too much – failing such a simple thing is a LOL. Grossly simplifying one (as suggested on youtube comments – just thief, cap and resistor). I’ve used 5.6uF 1206 SMD cercap, 5.1M 0805 resistor, PMBS3904 in sot 23 and hi-eff blue led – overall I’ve got shy 10uA average current while still getting very persuading bright blue flash about once in couple of seconds. I’ve also found funny enclosure for this little cheat, making it look like part of office alarm system, haha. A perfect joke for few vandal-unsafe places, granted most expensive part is battery and enclosure. And according to my computations battery would last … for hell knows how long, at 10uA average it would rather self discharge I guess. That’s probably best use of joulr thief I’ve faced to the date XD

  16. BIJU K M says

    What is the advantage to get add on a transistor BC547 feedback circuit? Please give me reply….

    Reply
    • Swag says

      it is for keeping the output voltage restricted to a specified limit, and preventing any rise beyond that limit.

      Reply
      • BIJU MICHAEL says

        Thanks for yours valuable reply.Yours support in electronic science field really dedicated…god bless
        .

        Reply
        • Swag says

          It is my pleasure Biju!

          Reply
  17. Grace says

    Please for the bjt booster , how can I reduce the voltage to 7v instead of 30v as designed to charge a smart phone

    Reply
    • Swag says

      sorry, you cannot use a 1.5V AAA cell to charge a smart phone.

      Reply
  18. Grace says

    Thanks Swag, but can 3.7v lithium battery power the 555ic. You said +5v to 12v input.

    Reply
    • Swag says

      Hi Grace, yes you are right, normal 555 ICs will not work with 3.7V but the CMOS version (7)555 can be used which is rated to work with minimum 3V

      Reply
  19. Norman Kelley says

    Hi Swagatam! I have tested the above circuit which uses a 555 timer and the output is 38.6 volts using a 100uH through hole fixed inductor. I tried changing the pin 6 to pin 7 resistor to 10K with no change. I have 22uH, 47uH, 68uH, 100uH, 220uH, 330uH 470uH, 1MuH inductors. I tried 47uH inductor and the output voltage was 38.9v. I tried 220uH and the output voltage was about 37.8v. I tried 3v, 6v, 9v, 12v input with almost the same results. It just takes longer to reach max voltage as the supply voltage is reduced.What should I modify to get 20-24v output? I only have 20volt 1/2 watt Zener available. I looked at other posts which use a Zener to control the output voltage but they require a 1-watt Zener. Thanks!

    Reply
    • Swag says

      Hi Norman, you can adjust the voltage either by changing the number of turns of the inductor or simply by adjusting the 1K value between the pin#6 and 7.

      Reply
  20. Raghavendra says

    Thank you sir for replying

    Reply
  21. Godson says

    Hello sir Swagatam,
    Thanks a lot for this post.
    I would like to use the IC555 version to boost 3.7V Li ion battery to 12V. What modifications do I need to make to achieve this?
    Will the output be suitable for powering circuits that have ICs in them?

    Reply
    • Swag says

      Thanks Godson, you can use the same design as shown in the above article

      Reply
  22. Shigida says

    Good afternone sir!
    I would like to use this boost converter (the first picture) to lit the LED at night and
    as a charger (at day) of 4.5 v cell (3×1.5 cell) .The LEd position will be also the position of cells .And on the position of the cell (on the above picture) will come a small solar panel.can you show me how to do a current limiting that can be used for both task (maybe by useing poti?).
    Thankyou in advance!

    Reply
    • Swag says

      Hello Shigida, I think for this low current application you could probably limit the current with a resistor in series with the battery positive or negative terminal. The resistor value could be calculated using Ohms law:
      R = V/I
      where V will be output voltage minus battery voltage and I will be the safe charging current of the battery. Make sure the max output is slightly lower than the battery’s full charge level.

      Reply
  23. g says

    hello, how can i make the Simple Boost Converter using a single BJT circuit work with a solar panel to charge the battery?

    Reply
    • Swag says

      Hi, please see the diagram at the bottom of this article, it might be just what you are looking for

      https://www.homemade-circuits.com/simplest-automatic-led-solar-light/

      Reply
      • ge says

        thanks for the reply.
        however i would like to use 1 battery instead of 3 to keep the circuit as small as possible.

        Reply
        • Swag says

          All the circuits referred here use a single battery. So perhaps you can try the first design from the above article

          Reply


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