# Search for buck in Topics

### Circuit Design for DC to DC Buck-Boost Converter

Sir, I am Anand from india, I will made a project based on bicycle. I have take 5 to 80v From my Bicycle pedals. Generator power is in AC 3-Phase. I want to made next step. in this I want to this 3-Phase AC 5 to 80V are constant At 48V DC. I put the 4 batteries in series. 12V 20Ah battery I use. I want to charge this batteries please help me. Thank you.

Question by AnandC10    |  last reply

### DIY 4-component Buck converter, no ICs, need help with maths

I'm building a bike light around a Seoul P4 LED and some re-purposed 18650 li-ion cells from a laptop battery. I'll need 700mA constant current and can comfortably fit 8 cells in my enclosure. I've done some reading and I should be able to build a Buck converter relatively easily, but I'm struggling to find any good guides to help me spec the components. I asked on Dave Jones's EEVBlog forums and all the replies recommended either Linear Regulators (wasteful) or something designed using Webbench, which only helps with circuits featuring ICs. As a buck should in theory only need a transistor, a diode, an incuctor and a capacitor I want to build it myself out of through-hole components. Can anyone help with some guides or tutorials on specifying these components please? My degree was Computer Science and I was definitely better at set theory and boolean algebra than anything involving formulae!

Topic by ederfel    |  last reply

### Help with a voltage regulator for a DIY bench psu

Hello i have an atx that i would convert into a diy bench power supply but i just realize that it was just 12v and my thing work need more voltage range so i decided to use an old, but still working, Hp 30v ps. so i was looking for a way to regulated it easy, i found the lm2596 and i dont know if it would endure or use lineal regulator such the lm317. so, i need help for any inexpensive alternative or any schematics, or whatever let me step up/down the voltage. Thanks.

Topic by mario.negretemunoz    |  last reply

### Circuit Design for DC to DC Buck-Boost Converter

Sir, I am Anand from india, I will made a project based on bicycle. I have take 5 to 80v From my Bicycle pedals. Generator power is in AC 3-Phase. I want to made next step. in this I want to this 3-Phase AC 5 to 80V are constant At 48V DC. I put the 4 batteries in series. 12V 20Ah battery I use. I want to charge this batteries please help me. Thank you.

Topic by AnandC10    |  last reply

### Which Boost/buck converter? LTC3780 vs LM2577S LM2596S

Hi, brought two boost buck converters to build a bench power supply from a atx psu.  Brought the LM version first as i have read previously that these are quite efficient, then seen the LTC one, so thought i might as well buy that as well.  Looks like the LTC board will be able to go down to lower voltages and appears to have a greater efficiency, quoted up too 98%, compared with the LM's at around 80%. Thou i understand that with adjustments changes efficncey.  LM2577S LM2596S http://www.ebay.co.uk/itm/281777880409?_trksid=p2057872.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT LTC3780 http://www.ebay.co.uk/itm/332009159315?_trksid=p2057872.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT Which one do you think i should use? Regards

Topic by JonathanM221    |  last reply

### Power a Raspberry Pi and an audio amp on the same circuit?

Hello. I want to use a 3A 12V power supply to power a Raspberry Pi Zero W and a 12v/50W audio amp. I think what I should do is a) split the power from the supply, b) connect the amp directly to the 12V and c) on the other leg, pass the source through a step-down buck converter. I have two questions:1. Is this feasible?2. I also want to pass the 12V through a relay that will be controlled by the Pi. Will this mean that all 3A will go to the Pi when the relay is open and the amp is off? Is that bad?Thanks!

Question by flagrantfouler    |  last reply

### Constant voltage AND constant current? Answered

Hi, smart people of the internet :) Is there a power supply or a converter that can be set on a specific voltage and current, and keep both constant at the same time? I looked at ebay converters like B3606, DPS5015, BST400 and the like. They all have constant voltage (CV) and constant current (CC) settings, but they can't do both at the same time. If for example the current being drawn is too high, the unit switches from CV to CC and drops the voltage as much as needed to keep the current constant. Is a simultaneous CC CV power supply even a thing? Thanks!

Question by Morgantao    |  last reply

### isolated buck converter idea Answered

I was wonder as a proof of concept, will this work? this schematic below works by charging a high current capacitor which has a small amount of series inductance to temporarily limit the current, and after charging, the switch (similar to the H bridge configuration) dumps the charge into a storage/smoothing capacitor. By using this method, one can eliminate the cost of transformers in isolated buck converters. A control circuit will control the pulse width into the smoothing capacitor through a negative feedback loop (AKA, as the voltage on the storage cap rises to a target value, the PWM will decrease until the high current capacitor is permanently connected to the DC supply. as the voltage drops, the duty cycle will increase to a 50% maximum.) I am just curious why this might not work, and if it does, does such a system already exist?

Question by -max-    |  last reply

### Buck Converter for Parallel LED's

Topic by soulmouse    |  last reply

### How to earn a quick Buck!?!?!?!?!?!?

I having money trouble and i need to know how i can earn a quick buck?!?!?!?

Topic by killer7    |  last reply

### Mechanical Bucking Rodeo Bull

Hey everyone, does anyone have plans or know a website that explains how to make your own mechanical bucking bull? Doesn't have to be as complicated as a proper one, just something to have a bit of fun on, and not too expensive to make. Thanks!

Topic by tapdogs1    |  last reply

### Led buck converter schematic Answered

I have been looking for a led buck converter schematic for quite some time now and i haven't been able to find one that suits my needs. i have a single 3 watt led that i believe needs 700ma to run. My whole purpose for the converter is to dim the led so it will have a longer battery life. i'll run it off of some rechargeable batteries that i can remove. Also i would like to be able to purchase most of the parts fairly easily. The requirements of the buck converter. -Compact -Battery powered -Dimmable -Capable of powering a 3w 700ma led This is a link to the data sheet of the led: http://futurlec.com/LED/LUXEON_3W_WHITE.shtml Thanks in advance

Question by Logan Hanssen    |  last reply

### motor as a generator + buck converter

Hi, for a school project, I have to make a wind-powered smartphone generator. So would I be able to use a 12v motor as the generator and a boost converter to convert the current to 5v? If so what kind of voltage will the motor produce? And what kind of diode will I need to prevent backwards current?  thanks.

Question by MukymooD    |  last reply

### Ultra low voltage buck converter

I want to step down voltage from a 1.2/1.5v battery to 0.05V. Any advice?

Topic by huzefa    |  last reply

### HI I LIVE IN THE UK AND I NEED SOMETHING LIKE BUCKSHOT BUT CANT GET IT PLEASE TELL ME SOMETHING SIMMILAR OR SOMETHING?

PLZ

Question by sharlston    |  last reply

### What buckpuck should I use with a 12 volt 5 amp/hour SLA battery with a Cree MC-E LED? Answered

First:  The Cree MC-E LED is rated at 350 milliamps but has a max voltage of 700 milliamps.  Does that mean I should get a 350 or 700 milliamp driver.   Two:  On ledsupply there are wired buckpucks with external dimming and potentiometers.  What is the difference between external dimming and what a potentiometer would do (lower the voltage and so dim the light)? Three:  On Deal Extreme it says driving voltage/current is 3.2V~3.5V, 350mA~700mA.  On ledsupply it says "12.8Vf - Typ. Forward Voltage @ 350mA and 13.6Vf - Typ. Forward Voltage @ 700mA?  What is the difference between driving and forward voltage/current?  What voltage and current comes out of the buckpuck? I am trying to make a bike light.  Thanks for the input -jacob

Question by Noblenutria    |  last reply

### Use of IC Buck-Boost drivers in automotive LED lighting projects

I've been contemplating the use of high power amber or yellow LEDs in a low cost automotive warning system (think tow truck).  However, car electrical systems are not set at 12v.  They can range from 9 to 19v with spikes up to 70v.  To protect the components I would need more than just a current limiting resister.  Under those conditions they would need a buck-boost driver.  Unfortunately I'm new to ICs/power LEDa and not sure where to start.  I was hoping someone would be able to help me out with further guidance.  I Thanks! -Mike

Topic by vanmankline

### MATLAB Simscape Power Systems & Electronic ?

Hello! I need tutoring MATLAB Simscape Power Systems and Electronic. I am working on a project in which I am trying to simulate Photo voltaic panel charging battery with controller ( dc-dc buck-boost converter) with Maximum Power Point Tracker and without it. I need to calculate efficiency for both cases. I have stared part of it with searching online Please, if you can help let me know

Question by skumu    |  last reply

### Do you always need a buckpuck for high powered LEDs? Answered

I want to power a Cree MC-E LED with a 12 volt 5 amp/h SLA battery.  Most of the time you have to use a buckpuck (an LED Driver).  Do you always have to use a buckpuck?  If I have a 12 volt battery and a 12 volt LED like the CREE MC-E, then I don't need a driver, right? Thanks Jacob

Question by Noblenutria    |  last reply

### 64 w solar panel without a charge controller or battries but using a buck converter for direct regulated power?possible?

Greetings and thanks in advance for all the help. i shall start with explaining the situation.  i am going to be in the remote himalayas for about 2 months with a expedition team and for all our charging needs  we are going to carry a few solar panels, most of them are small 5-15 watt ones . the problem comes in when i introduced the 64 w thin film roll able panel. the specifications for the panel are as follows Model PVL-64 Rated Power 64 (Watts) Rated Voltage 16.5 (Vmp) Rated Current 3.9 (Imp) Open Circuit Voltage 23.8 (Voc) Short Circuit Current 4.8 (Isc) i intend  to use 3 LM2596 ebay buck converters to get 12 volts and 2 5V USB Output Converter DC 7V-24V To 5V 3A Step-Down Buck KIS3R33S Module KIS-3R33S for usb power. All of these will have a common source of power (the solar panel) and have separate outputs as i need to charge multiple things at once.  will this setup work or i need to think of something else.?

Question by 1st rover    |  last reply

### Laptop powerbank 12v to 20v and upto 5A output using 18650 batteries with USB 5v added

Topic by ScottL190    |  last reply

### 36Vd.c. @ 8.3A Power Supply + Buck Converter

Hello Friends, I have a 36Vd.c. @ 8.3A Power Supply that I would like to convert into a Variable Bench Power Supply. After researching the topic, I have decided on choosing a Buck Converter as opposed to a Linear Regulator.  Shopping around online, I stumbled upon the LM2596 Converter: http://www.ebay.com/itm/DROK-LM2596-DC-Buck-Converter-4-0-40V-to-1-25-37V-5-12V-24V-2A-DC-Voltage-Reg-/301381167269?pt=LH_DefaultDomain_0&hash;=item462bb7a8a5                      Any thoughts and or suggestions? Beyond that, I do have a general question... I've read on a few power supply instructables that it's recommended that all rails be used (for example all yellow/12v cables) to insure a more steady current. Now being that the max output of the above mentioned power supply is 8.3A and (please correct me if I'm wrong) according to the supplied spec sheets, power is coming from 3 rails, would it be safe to assume it not necessary to feed all rails into a buck converter since its output is only 2A? Please put me in my place...

Topic by davidkiyan    |  last reply

### dc-dc Buck vs boost efficiency

Hi guys. When you  use solar panels and have gadgets with different voltage requirements  that you want to power up. I need atleast  2 different outputs, 5v and 12v  ,   so which is most efficient ,  12/15v panels that you  regulate to 5v , or  5v panels boosted  to 12v? is there any general advantage in either case and i,m talking about using  cheap ebay switch regulators / boost converters,  not anything expensive hi tech. regards

Topic by kristerh    |  last reply

### Deer

Want a trampoline for five bucks? That is real doe.

Topic by Josehf Murchison    |  last reply

### Mobile phone wind generator

Hi at school, I am making a mobile phone generator. It's only GCSE so my apologies for my lack of knowledge. It is meant to be a "wind generator" but it can basically be a renewable generator via motion. So since I get to take it home afterwards I designed it to be a little record player where you turned the platter and it would change a phone. This is where I need some help. Would this 24v motor provide enough juice to charge a lithium ion battery (with a boost or buck converter [if needed to step down to an appropriate voltage] then a constant current protection circuit etc) the output 5v to charge your phone? Here is the motor: http://uk.rs-online.com/web/p/products/2483716/?grossPr...|pcrid|88056614883|pkw||pmt||prd|2483716&gclid;=CjwKEAiA4dPCBRCM4dqhlv2R1R8SJABom9pHi1B_sRuR-4nr15ce-EWd51aCsEfYqFBsUJioUXEpvRoC1unw_wcB Thanks! For non-British readers :  a GCSE is (in the UK except Scotland) a qualification in a specific subject typically taken by school students aged 14–16, at a level below A level.

Topic by MukymooD    |  last reply

### Would anyone like a company for students to make money selling things we like - apparel, accessories, electronics?

Would anyone be interested in a company geared for students to make money selling things we like - apparel, accessories, electronics? I have found tons of companies that say they are for students to earn money while in school but none of them were something I would use. I tried selling phone service, but found that it was a bad product. I have and had friends that sold Cutco, but none of us use kitchen cutlery, so that left us to roaming the neighborhood and selling to parents and adults. I started selling watches to my friends and classmates and was fairly profitable. The isses I came across when selling the watches were finding a decent watch, multiple designs or styles (no one wanted to be wearing the same watch as the next guy) and having enough money to buy inventory and sell the inventory before I can buy other styles. I am interested in finding out if there are any other people interested in a company that is geared for students so we can make money buying and selling things that we like and would use ourselves, like watches.

Question by King Haus    |  last reply

### Aquarium LED driver?

Im looking for a schematic that controls 1w leds for my fish tank light? i need the control to be dimmable and hopefully programmable so i can incorporate a sun motion effect and then a moon motion effect! i say hopefully because this will need to be an add on later in the project as id like to have the initial lighting up as quickly as possible! As far as i know so far, the circuit is a basic constant current circuit but  i need a "buck" driver or PWM to enable the dimming by varying the current! so my questions are :- 1. Does anyone know of a simple, reliable and cheap circuit to use? 2. Because of the amount of LED's ill be using im not sure i like the idea of having all the lights in a series configuration because if one fails, thats a lot of lights to test! 3. If i have to use a computer to run the lights id like to be able to make it compatable with the raspberry pi therefore id need a program and mounting software for the pi, so anyone know of one? 4.Right to the power, i dont care what voltage it runs on but id like to only utalize one plug socket if possible, i do have a few power supplies laying about for various things like old laptops and old pc's, so what do i need to power it! i cant think of any more at the moment but you guys know what im trying to achieve so im sure you know what questions i have missed! as i said though, id like to start simple and work up to sun motion control and timers! Thanks in advance for any help anyone is offering!

Question by Xmortx114145    |  last reply

### Supercapacitor Voltage Draw

If I am charging a super capacitor with buck converter, that is a 1 amp, 1-18 volt output, and the capacitor is rated for 2.5 volts, how do I stop the buck converter from feeding it more than 2.5 volts? When I attach the capacitor to my digital power supply, it starts charging, and the voltage slowly increase to be more than 2.5 volts, at which point I turn it off. I was wondering will it draw more than 2.5 volts from my buck converter? If so how do I stop it?

Topic by merlinj    |  last reply

### Copy record to CD programs

Question by Steve Buck    |  last reply

### I am making a 9 volt battery powered USB charger for my friends phone. I need some help as I am using a buck converter.

I am not sure how I would attach this and what each of the pins on the buck converter does.  I could have made one out of a 5 volt regulator, or this:  http://tinyurl.com/switch-regulator, but I don't have \$15 (I have no source of income) to spend on my friends gift and I want it to be highly efficient.  I am waiting for the buck converter to show up in the mail right now.  The datasheet for the buck converter is: http://tinyurl.com/buck-converter.  Also, I found a website that sells the kits for these: http://tinyurl.com/9v-charger for 16 dollars, but once again I don't have any money.  I want to make a charger like the one they have on there out of free samples.  Thanks for the help, Mike P.S.  My friend has an android.

Question by furrysalamander

### BUCK BOOST CONVETER SPECS INPUT 12V-24V AND OUTPUT IS 18V

PLEASE HELPI am building a dc buck boost converter, my feed =back is maintained using a PI-CONTROLLER. The problem is that when am connecting my load which is 13.9ohm(power resistor) its drawing tomuch current and the is a huge voltage drop which is about 11V ,i want to know how to i limit the load from drawing tomuch current

Question by BubeleM

### what can i make when i am bored and make a few bucks? Answered

What dan i make when i am bored an it would not hurt if i could make a few bucks

Question by bobbambusle    |  last reply

### Robot

I want to build a robot that will cost a max of 300 bucks. Any ideas?

Topic by sci4me

### The risks of DIY carpet cleaning and how save a buck or two....

Topic by Downunder35m

### Arduino code problem... I will paypal a few bucks for some help...

I have the code all written just missimg one simple step...?.. I can explain more please private messages me if you are really good at code oe whatever... this is my first day with this stuff

Question by nail2010    |  last reply

### Why do DC-DC buck-converters not start at 0 volts? Answered

I have been looking into DC-DC converters to build a variable power supply but I've haven't been able to find one which starts at 0 volts. Most of them seem to start at 5-10 volts with the lowest I've seen starting at 0.8 volts. Is there any reason for this? Thanks,

Question by Smret45    |  last reply

### Please can I have some help with a boost/buck convertor?

HiI want to use one of the cheap boost/buck convertor to increase and decrease variably my 12v power supply. I have now purchase and (bricked) 4 now as each time I remove the board bound pots and solder in ones I can mount on the front panel I must wire them incorrectly even though I mirror the pin set up. I have tried all types of pots single turn and multi-turn always make sure I match the resistance value of the original.Please help, what is this rooky doing wrong?

Question by Rushey    |  last reply

### led matrix?

I want to build an led matrix for under 50 bucks that dose not use Arduino. is there any way to do it?

Question by knexinventer    |  last reply

### led driver for a 30w led i dont want to pay the 30 bucks for one, i need to know how to use it without the driver?

Do i need the led driver for a 30w led i dont want to pay the 30 bucks for one, i need to know how to use it without the driver? heres the led http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item;=160418184744

Question by antonbergjr    |  last reply

### Astrosyn Stepper Motors

I have 2 Astrosyn Stepper Motors that I bought and ended up not using. I was going to build a small cnc machine first but decided to go bigger with the first on I built. So i bought bigger steppers for my application. I bought them for 20 bucks each and now I am selling them for 20 bucks plus shipping for both. I would like to use paypal for any transactions. Thanks for looking.

Topic by r1dd1ck913    |  last reply

### where is a good place to get a box of 100 cheap mousepads for about oh say 20 bucks thank you?

Question by xproplayer    |  last reply

### My New Knex Arsonal

I just bought this set off ebay for 50 bucks... do you think it was worth it? post pics of yours too

Topic by iKill    |  last reply

### how does a 10 year old make money fast?

How do you make 10 bucks in 10 minutes

Question by zack attack    |  last reply

### How do I increase 3A fixed output current of a buck converter?

Basically I am making a solar inverter without any battery or charge controller that will directly convert the dc output coming from solar panels (6 connected in parallel) into 220V AC.I am using solar panels 50W each, having an open circuit voltage of 20V and the voltage varies between 15-20V during the entire day provided a minimum amount of sunlight is there. Next, I am using a 12V buck converter circuit using an LM2576 (here is the datesheet of lm2576)and few more components to get a stable output voltage of 12V out of the panels. Now this 12V DC is fed to an inverter circuit which converts it into a square/modified sine wave 220V AC at approximately 50Hz. But, I am not getting desirable power output. From 6 panels, all I am able to power is a 45W LED bulb along with a small 3W LED bulb. Probably, one problem is with LM2576 buck converter IC. This IC although providing a constant 12V output but it is rated at a 3A fixed output current. And I think probably this is the reason why we are unable to drive more loads. Is there a way to amplify current in this case? Or something else should be done which I am missing here ?

Question by DELETED_MakiY2    |  last reply

### winterize a camper/motorhome

We are tired of spending \$85 bucks to have someone winterize our camper.  Do you need to blow the lines out with air? how much antifreez and were

Topic by geohsnider    |  last reply

### Uni-polor Stepper Motors

OK so now I have some Unipolor stepper motors for sell. 20 bucks plus shipping takes all 3. Thanks for looking.

Topic by r1dd1ck913    |  last reply

### is it possible to repair a glow plug?

I use nitro rcs alot and use quite a bit of glow plugs and at five bucks each . i want to know if these are possible to repair or extend life

Question by mclovin7596    |  last reply

### SOME KEWL GRAFFITI

WHO EVER HAS THE BEST GRAFFITI WILL GET A FREE GRAFFITI PROGRAM THAT USUALLY COSTS \$149 BUCKS JUST COMMENT YOUR PIC OR GRAFF AND BTW I KNOW IF U GOT IT OFF GOOGLE OR YAHOO

Topic by DIRTYSHOTZZ    |  last reply

### Pre set voltage regulator/supply

Hi I want to modify the DC to DC buck circuit that is sold anywhere, to have pre-set voltage by pressing only one button it will set at 3, 5,9 and 12 output

Question by nickp238

### I want to build the Swinging Sticks.

I would like to build the swinging sticks (more famously seen in Iron Man 2.)   It is 279 bucks so I need a cheaper solution. Thanks for the help.