Click here for instructions on how to enable JavaScript in your browser. Circuit Diagram. I need to convert 3v to 5v, what do i modify in this circuit? The BC is only capable of mA so this would be a low current application. You need to find an IC that functions like the but runs on 3v instead of 5. Leave a Reply Cancel reply Your email address will not be published.
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The key principle that drives the boost converter is the tendency of an inductor to resist changes in current by either increasing or decreasing the energy stored in the inductor magnetic field. In a boost converter , the output voltage is always higher than the input voltage.
Simple non-inverting op-amp amplifier circuit — how to boost mV to A transistor can be used to increase current. The collector current will be a multiple of the base current if the circuit allows it. An open-collector output and a pull-up resistor should convert 5V signal to 12V.
You can use an NPN transistor and base resistor to change your output to an open-collector output. This said, joule thief is funny thing to power small led or so out of 1. Joule thief key property that makes it interesting is that it runs down to like 0. However it implies startup problems if battery got below 0. However joule thief gets its edge over many other circuits when it comes to using 1.
Grossly simplifying one as suggested on youtube comments — just thief, cap and resistor. 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.
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. Sir please I build a boost converter using 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.
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.
Sir I have seen my mistake all this while the diode was connected wrongly but now is working very well thanks for your assistance. 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 switching should be in millisconds, if you hold it even for 0. You can read the following article for more info:. Hello sir For giving the gate pulse to the BJt can i give it through Arduino? Hi Parsiva, you can do that, just make sure that the duty cycle and the frequency are optimally adjusted.
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. 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. 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 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. 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? Thank you Miracletech, yes you can try that for the first diagram. For more options you can also refer to this article:.
Please is there any other pwm oscillator ic I can use instead of or can I equally use the popular viper22A or Rm used for flyback converters, will it work.
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.
If you are referring to TL circuit, you can change its Rt, or Ct values to change its frequency. Did you confirm the frequency with an oscilloscope?
For higher frequency you can probably try the following version:. Ordu, uF can be replaced with uF, but the 0. 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.
Rudi, the winding is not critical at all. We want it to be able to recharge for follow on use.
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