The forums are retiring and are now closed for new topics and comments. The existing content will remain online and accessible through 2020 to provide everyone the opportunity to save any relevant information. In the spring of 2021, these Community forums will be taken offline.

Search for Stepdown in Topics


A speciel stepdown converter?

Hello guys of instructables! I'm writing on this forum, because I think you the only guys that can help me! My situation: I'm from Europe (Nordic part), and our voltage/hertz is 230v 50hz - I think. What I'm trying to do is using american clippers here in my country, but what I've experienced is that it really going to work because the magnetic motor in the hair clipper is going to make alot of noise and overheat, even tho if you used a stepdown converter (230v to 110v) My request: But yesterday i saw a guy on youtube which said that he had made a revolutionary stepdown converter, that would solve the problem and make american clippers anywhere in Europe - without overheating and noise. Here is the video:  http://youtu.be/I2Ybj1BKjYk?list=UUpnyPxtX9XwOJZbN8qwVoLg And here is a ebay link of the converter: http://www.ebay.ie/itm/181496829039 I think its a bit of a overprice (119.3575$) and I was wondering if there is an alternative, where can either make it myself or buy one as good as that one with same specs and quality.. I hope you guys can help me, I'm a bit of unexperienced guy when it comes to electronics so bare with me.. - josh

Question by joshua1993  



How do I design a Step Down Switching Circuit from a 12V 3A lead acid battery to a 5V 1A Load?

I am designing a solar panel charger for usb devices, I have a 12V 3A lead acid battery and I want that reduced to 5V 1A to comply with most portable devices, Help is much appreciated and diagrams would be ideal

Question by EmptyCoffin92    |  last reply


How to step down a 12v DMX LED Controller to 5v?

Hey i currently have an "Abstract MFD-10" DMX controller that i want to run 64 LEDs/2meters of "LPD8806 +5v Strips" off of. DMX Controller= http://www.abstractavr.com/products/dmx-led-drivers/60w-dmx-led-driver/ Led Strips= http://www.adafruit.com/products/306 How do i step down the 12v supply to 5v while maintaining the flow to keep the strips running effectively? If you give me the formula for it i can work it out myself and will post here with what i worked out as i enjoy doing my own workings but i am a bit lost with this. Also I am willing to simply change a component in the controller itself if this would be easier and cleaner (No external boards/components) Need anymore info just ask.

Question by Pathogenex    |  last reply


how many watts does my rock tumbler use?

I just bought a rock tumbler off ebay. the brand name is "chicago power tools". its a basic 3lb capasity rock tumbler/ lapidary rotary tool. now, because i live in australia, i have a problem, my power outlets produce 240v , and the rock tumbler can only take 120v, and so when i pluged it into a power adaptor (us-aus), the transformer gegan to work, then overheated and produced smoke, fortunately it still works . now, i am going to go and buy a stepdown transformer and have learnt that if the device is using more than 90% of what the transformer supplies, the transformer will overheat or break or something. now, on my tumbler, and everywhere a description for it is put, it mentions nothing on wattage consumption, and so i am asking , how many watts will it use so i may accordingly select a stepdown transformer for it.

Question by oldmanbeefjerky    |  last reply


Need to go from 12v to 5v, back to 12v

I have a remote controlled submersible craft and the controller that came with it is incredible clunky. It has 3 switches that each control a motor and you almost need 3 hands to effectively drive the thing. What I want to do is take the 3 switches out and use 2 joy sticks instead – like this schematic I drew up.My problem is that the power coming from the terminals for the original switches is 12v 7Ah, and the joysticks I have are rated for 5v. I need to step down from 12v at the switch terminals from the board to 5v for the joy stick, then from 5v at the joystick back to 12v so I can run power to the motors. Anyone have any ideas?

Question by liebs8888    |  last reply


Stepdown from 19V to 12V using 3 IC for reduce the heat output?

Hey guys,  I want stepdown my charger laptop from 19V to 12V but I read from https://www.instructables.com/answers/19v-to-12v-without-current-drop/ they said IC produce excessive heat if I connect it directly, Then does by doing 3 stages of reduction, can reduce the heat output of the IC? For example I use 7818 > 7815 > 7812 for 3 stages of reduction.

Question by goldenyears1x    |  last reply


use 5V from stepdown from 12V power reciever FS-IA10B but it doesn't turn on

Hi all, Please hlep if you know why I use my 5v (get from step down 12V battery), my reciever doesn't turn on. But when I use a parkage of battery from my rc toy, it turn on i have checked cable, conections all good. Not sure why it doesn't turn on thank you

Question by dreamer0305    |  last reply


Using 110v 60Hz Soldering station with 240v 50Hz?

Hi, I have recently acquired a 110v 60Hz Soldering station but i live in a country which uses 240v at 50Hz. I can get a stepdown transformer to convert the voltage (can choose between 50W and 1600W), but i am wondering will the different frequency damage the soldering station? The soldering station i got is https://www.sparkfun.com/products/10707

Question by michaelgohjs    |  last reply


Fun withTransformers

Connect the output of 2 transformers in series...  12v  +  6 v. much as you would connect batteries in series. will it burn out?  will it produce 18 v as one would expect with batteries?......... 18 volts!!  yay!   hasnt burnt out( YET)... i wont leave this unattended. transmission of power is more efficient at high v.     sooooo... if i hook the output of a 10,000 v  neon transformer to 2 thin strands of wire( think magnet wire, or a single strand from stranded cable)   and input this  10,000 v into the secondary of a second identical neon transformer, will i get usable 120 v from the primary?  (attempt to run the second transformer in reverse as a stepdown) Nope... not YET.  Suggestions?

Topic by Toga_Dan    |  last reply


Does Replacement Batteries Harm Cordless Tools, Or Just Not Worth the Savings in the Long Run?

Should I stick to Makita HandBook for Cordless 18v LXT stating "Only use Makita Batteries and Charger", or go for the replacements? Same goes for  "StepDown Transformers [220v to 110v] can harm tools etc...etc..." I can dig the reason if it where for corded tools, but am I really jeopardizing my DC18RC 110v? Which Replacement Batteries Do You Recommend? Does it goes the same way for such rechargeable batteries (and chargers) that are made in China, that as the description specifies, made from China, so don't expect much?

Question by GiladM1    |  last reply


Countdown timer doesn't exit and the loop never repeats?

We want to run the stepper motor by 180 degrees and want to repeat it after long delay (say 2 hours or so) with a countdown timer displayed in LCD attached to Arduino. Every thing happening successfully except the loop doesn't start after the countdown ends. #include #include const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution // for your motor // initialize the stepper library on pins 8 through 11: Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11); // initialize the library with the numbers of the interface pins LiquidCrystal lcd(7, 6, 5, 4, 3, 2); int hours = 0; // start hours int minutes = 0; //start min int seconds = 10; //start seconds int stepCount = 0;         // number of steps the motor has taken void setup() {   // initialize the serial port:   Serial.begin(9600);   pinMode(13, OUTPUT);   // set up the LCD's number of columns and rows:   lcd.begin(16, 2);   // Print a message to the LCD. } void loop() {   // set the cursor to column 0, line 0   // (note: line 0 is the first row, since counting begins with 0):   lcd.setCursor(0, 0);   lcd.print("DRUM ROTAING");   for (int i = 0; i <= 100; i++) {     // step one step:     myStepper.step(1);     Serial.print("steps:");     Serial.println(stepCount);     stepCount++;     delay(125);   }   lcd.clear();   lcd.setCursor(0, 0);   lcd.begin(16, 2);   lcd.print("Count Down Timer ");   delay(150);   while (hours > 0 || minutes > 0 || seconds >= 0) {     lcd.setCursor(4, 2);     (hours < 10) ? lcd.print("0") : NULL;     lcd.print(hours);     lcd.print(":");     (minutes < 10) ? lcd.print("0") : NULL;     lcd.print(minutes);     lcd.print(":");     (seconds < 10) ? lcd.print("0") : NULL;     lcd.print(seconds);     lcd.display();     stepDown();     delay(1000);   } } void stepDown() {   if (seconds > 0) {     seconds -= 1;   } else {     if (minutes > 0) {       seconds = 59;       minutes -= 1;     } else {       if (hours > 0) {         seconds = 59;         minutes = 59;         hours -= 1;       } else {               }     }   } } We used break, return 0, continue, etc. but somehow didn't work. Kindly tell how to exit so that program repeats itself. Thanks.

Question by meetshivam    |  last reply


Portable speaker boombox wiring help?

Hi guys, I'm currently in the planning/semi-begun-building stage of my first DIY electronics project, which is in the form of a portable boombox based around the lepai 2020A+ amp and the Sure APT-X Bluetooth 4.0 module (which both run off 12v). Despite searching the entire internet up and down, I just can't seem to make the electrical/power side of the wiring clear in my head. And to be honest, I'm a little worried about burning a house down/killing a battery and would be very grateful for some help. I'm looking at incorporating a cig lighter 12v socket for charging accessories like phones/audio players/whatever through a classic car to usb device as the stepdown, as well as a 2.1mm DC jack that can be used to charge the battery via AC mains (240v in Australia) as well as via a small solar panel. I am sort of hoping that I could be playing music and charging accessories while the solar panel or AC mains is plugged in... basically I can have anything plugged in/not plugged in/left overnight by accident and the house wont burn down. I have attached a mock wiring diagram that worked in my head, but I really do doubt if this is actually an acceptable circuit. There are also a couple of components I have left off there because I simply wasn't sure where to put them. The first is a simple power switch, so that when off nothing can drain the battery. Is this a simple case of wiring in line on the positive lead between the battery and the solar charge controller? The second is a small volt/ammeter (http://www.ebay.com.au/itm/251498991739?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649) that I would desperately like to use to know both when the battery needs recharging, as well as how much current the amp is drawing. I have absolutely no idea where to begin with this one. The yellow wire is scaring me even though the product hasn't arrived yet! Can anyone help with this? Am I at least on the right track? I hope you understand my misunderstandings, and are accepting to an enthusiastic novice's questions Thanks!

Question by chemacky