voltage regulators and supercaps? Answered

I have 12 .22F 5 volt supercapacitors that i bought recently. Ive been thinking about making something like the Mintyboost from Adafruit but am unsure on how to do it with supercaps. Any help is appreciated as this is stumping me pretty well. thanks, bud

Asked by budhaztm 5 years ago


if I used a buck/boost voltage regulator and a 2.7 volt 200F supercapacitor, how long could I output 1.5 volts for?

It would also be nice if someone could explain exactly how a capacitor discharges over time in terms of voltage and remaining capacity. Is the rate of decay constant, and does it vary according to the capacitor?thx! =)

Asked by gottaseegottaknow 8 years ago



I want to power a laptop on supercapacitors. How would i do it with 2.5-2.7 v caps? what capacitance will i need? Answered

Battery: 10.8 v, 47 whr the charger says 18.5 v output, 3.5 A Laptop: Presario f500, Turion 64 Mk-36 2.0 ghz (800 mhz or less for most tasks) 2 gb ram, 100 gb hdd, ubuntu 9.10. i think its supposed to last aroun 2 1/2 hours on a charge, but the battery's really old so I can't know for certain. i want to switch to capacitors so i don't have to buy a new battery every couple of years.

Asked by sillyn00b 8 years ago


Supercapacitor for power supply design?

Hi I am new to electronics but I have studied the basics and the logic. I have 6 3000 farad supercapacitor from Maxwell(not the boost cap one) with a power rating of 3 watt- hour, so each capacitor holds about 10.8 kilo watts(3 watt x 3600 seconds= 10,800 watts). So I have been wanting to make a power supply out of these and two types have ran across my mind: 1. Turning them to a voltage multiplier type of circuit( so like a voltage multiplier but the capacitor is these capacitors). So I would have an output of 500 amperes(6 3000 farad capacitors in series would have a capacitance of 3000f/6=500f) and output voltage of 16.2 volts. For charging this power supply I will use a step down transformer connected to the mains with some circuit breaker, fuse, switch and ballast/ resistor at its input, the transformer will step it down to approximately 2 volts ac which then I will rectify with a bridge rectifier. 2. Putting them in parallel so I would have a total capacitance of 18,000 farad at 2.7 volts, and putting them in parallel with my power supply. So this works by charging the bank and the bank will discharge when fully charged. The power supply will be the same like the first design power supply. However this circuit seems very risky and I might need some feedbacks. For your information I live in Indonesia and the wall outlet have 220 volts with amperage of ~20 amperes So I have some questions which are: Q1. Which power supply design is more ideal in terms of safety and efficiency? And how can I improve? Q2. For power supply design 2, I believe I might need some "system" for timing the charge and discharge of the bank,what circuit or system should I use/ make? How about using relay? Or spark gap? Q3. What should I do to avoid explosion of capacitor in both power supply Q4. What components are recommended for the charging power supply and what diodes are recommended for the design one capacitor bank? I already have the thick wires necessary for this since i know both systems deliver huge amount of power. And please inform me if there is any mistake or anything wrong. Any input is very greatly appreciated, you don't meed to answer all question since i know is a lot and i don't want to waste anyone's precious time. Thank you so much for your time.

Asked by dikap123 3 years ago


How are massive supercapacitors used practically?

What about the massive supercapacitors used in pulse lasers? I have seen banks of capacitors the size of car batteries on youtube and they seem terrifying. Could these kinds of capacitors be used in circuitry as voltage regulators and not just as death machines?

Asked by matosky.caleb 4 months ago


Make supercapacitors from graphite in a DVD burner

The outline is that you can deposit graphite oxide (a cheap bulk material) onto a film of PET (the plastic used in Coke bottles), hit it with a commodity infra-red laser (such as the one in a $30 LightScribe DVD burner) and end up with a form of activated carbon material that can be used as the electrode in an electrolytic capacitor.  Add some aluminium foil, separator membrane and electrolyte and you've got cheap, robust energy storage.  The headline numbers are a few hundred milliFarads per cubic centimetre at a few volts, which works out to 1.36kWh per cubic metre of stacked capacitors.  It's still about 50 times less energy per volume than lead acid batteries, but you could store as much energy as your house will need overnight in the size of a garden shed or a set of bunk beds.  They charge/discharge in seconds and retain >95% capacity at 10,000 cycles so seem suitable for storage to even out intermittent energy generation from, for example, solar or wind power. I'm really thinking about cost here- unless I'm missing something fundamental it doesn't seem like producing these on a high volume roll-to-roll process would be excessively difficult, and the cycle life means the replacement time would be many years even in heavy usage.  Could you get sufficient kWh per dollar to make these a viable storage mechanism for home-scale renewables? There's a more informative article here.

Posted by PKM 6 years ago


What are polyacene batteries? Answered

Hi, I've recently come across these batteries that say "Polyacene Battery". I looked at the rating, and it's stated in Farads. I went on Wikipedia but it didn't show up, however the search results had one entry, "supercapacitors". So are these supercapacitors or batteries? I do however know they are rechargeable. PS The link to where i found these is http://www.goldmine-elec-products.com/prodinfo.asp?number=G13133A.

Asked by LiquidLightning 7 years ago


Capacitor as power supply circuit?

I have seen those heavily discounted maxwell ultracapacitors on electronic goldmine lately, and with the holidays around the corner I plan on having my hands on one soon. The two possibilities i might get are 1 3000F 2.7V capacitor, or 2 2600F 2.5V capacitors which can make 5200F 2.5V or 1300F 5V. (A side question: capacitors cannot really be chained in a long series like resistors can without running into problems, right? Isn't there a problem with the energy not being distributed evenly?) My main question is what circuit or ic I can use to turn this large capacitance into a useful power supply. Because of its discharge curve, If I wanted to run something that needed 2 volts, it would stop running although there is still plenty of energy. The other issue is the inherent low voltage of ultracapacitors in general. I hear this is because the activated carbon used to achieve such high capacitance has a low breakdown voltage and there isn't much they can do about it. If I wanted to create a power supply that delivered a constant 5 volts from a capactior with lower voltage, how would I go about doing this?Thanks!

Asked by seanroberts 7 years ago


where to find/recycle supercapacitors?

Been wondering just in what and where do they use super caps? i recycle any an all where i can and thought sum ofs ya could give me a clue as to where would a good source?i have coffee cans full of reg caps taken outta pcs an such but as far as i can tell i've never happened upon any super caps in anything yet.any info would help! thank you.

Posted by ripit 6 years ago


Charging BoostCaps

I recently got a few of the 3000 farad 2.7 boost caps from electronic goldmine.  I have a quick question about charging them.  Applying a higher than rated voltage before the capacitor is charged all the way would be fine, right?  The voltage drop should cause the source voltage to approach 0, thusly below the 2.7 volt rating.  As an extreme example, lets say you simply hooked up a 9 volt battery to it.  Since the battery can only supply like 200mA, the voltage drops to nearly 0 as the capacitor appears to be a dead short.  The dielectric (or ion exchange or napheon membrane or whatever it is in a ultracap, lol) should be fine, correct? My main goal is to later hook up one or two of these for a regenerative brake system of something like a small gokart or bike or something.  Stopping at 30mph is like (assuming 200kg total mass) 20k joules, and each one can hold about 10k joules, and assuming a max efficiency of like 30 or 40% (I think itd be much lower, though), these capacitors could brake a gokart going fairly several times without having to be discharged inbetween cycled (but of course they would be).  For braking, could these essentially be hooked up directly (of course with pwm, and other things, but in essence:) to the motor with a little protection circuitry to prevent overcharging the capacitors?  Or would the higher voltage instantly puncture and destroy the boostcap?

Posted by guyfrom7up 7 years ago


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?

Posted by merlinj 2 years ago


Best way to charge a SuperCap? Answered

Hi! I would greatly appreciate it if anyone would tell me the best way to charge a 2.7V 50F Nesscap supercapacitor. Any advice or ideas would help a lot; thanks! http://www.maplin.co.uk/p/50f-27v-super-capacitor-n51qq

Asked by Digital Flame 3 years ago


Printing Graphene?

Has anyone tried this? I have a lightscribe. Looking at the video it seems that all I need is some graphite oxide. I tried embeding the video but I don't think it is going to work. Here is a link to the video. The Super Supercapacitor | Brian Golden Davis from Focus Forward Films on Vimeo.

Posted by ehudwill 5 years ago


Mysterious translated version of an Instructable published

I'm not sure what's going on, but... I submitted an Instructable on 30 June. It was subsequently featured in the technology section. A few hours ago, I noticed a new draft of that Instructable, all in Spanish. The Spanish version of the Instructable was just published a few minutes ago. I neither created the draft nor published the Spanish Instructable. Was the original Instructable translated by an administrator? Is this normal? 

Posted by supercapacitor 3 years ago


Tree Speakers, Melon Brain, Pumpkin Silly String Shooter

Tree Speakers Melon Brain Pumpkin Silly String Shooter NES DVD Player Lady Gaga Caution Tape Costume Restoring Old Sneakers Cardboard Costume Helmet Supercapacitor USB Light Lady Gaga Bubble Costume Lady Gaga Baby Suits DIY Christian Louboutin Petal Sandals Sugru Mouse Grip Homemade Wakeboard Winch Gruesome Zombie Makeup Build a Full Tang Knife

Posted by randofo 7 years ago


Electric Go Kart with Graphene supercapacitor. Random Questions on electronics, control, and possible problems.

I have a project in mind that i am trying to start on and it all has to be done as cheap as possible (ACAP). The project idea is that after my graphene in finished and I make the capacitors I will construct the battery and group the many cells in series and parallels until I have either 36 or 48 volts and a lot of amp-hours or at least enough to drive the kart with unrestricted speed for AT LEAST 10-15 minutes. The big question I have is whether i can treat these, essentially fast charging batteries, as batteries or if I must use different methods to control power and connect to the motor.  Then I also don't know how exactly i am going to control the motor or even what type of motor to use and where to obtain it. I was thinking i could use some industrial PMDC motor and I would like to control it using a PWM and use a plate that a contact touches that would slide up and down the plate to make the contact closer and farther away from the end on which a cable would be attached so it varies the amount of resistance to make a potentiometer. The closed throttle would just be a button that the pedal pushes to disconnect the power to the potentiometer at another point in the wiring. If that actually works then how would I make or where would I buy something that could actually use that and be able to handle thousands of watts (like 10,000W @36-48volts minimum).  My other throttle idea was that i could just have the pedal activate multiple solenoids so that there is like 5 stages of power activated by the solenoids. I have heard that problems with this is that when the first battery runs out you have to charge it otherwise it will be destroyed, though i am not sure if this will affect the graphene supercapacitors. If anyone know anything about graphene in applications please let me know because that would be way easier. The last thing is that since the graphene will be made on disks by laser scribing them could i just make the cells the shape of CD disks and then put the in one of those disk holders and then wire those to each other in series until i have the desired voltage and then in parallels until I run out??? If anyone has made graphene cells and used them please tell me where u obtained the Graphene oxide and how you made the graphene and cells and etc.

Asked by hopekiller30 3 years ago


BOUNCE: original game (download here)

BOUNCEBOUNCEBOUNCE [download] BOUNCE is an original 2D platform style game built in Java. The game incorporates game elements like destructible terrain, 3rd person shooting, and puzzles, to provide an experience similar to such games as Mario and Minecraft. You, a lone circle in a world of squares, must make your way through 50 levels to save the galaxy from destruction. Along the way, you'll face laser shooting robots, parkour puzzles, and fire-breathing dragons. More information available at http://www.java-gaming.org/topics/iconified/27023/view.html.

Posted by supercapacitor 3 years ago


I want to run 3 LEDs off of a super capacitor, help?

Alright, so I have a little project going on and basically, I am going to have a 5.5 volt .33ff supercapacitor to power 3 3mm white leds, at 3 volts each, each takes 30 miliamps. I need the led's to be in series. How can I do this? What resistor would I need to throw in the make it work out, or would I not need one? I want them all to run at full brightess, but how long will it last? I could modity the plans for two LEDs.

Asked by XOIIO 6 years ago


Paper Batteries

Has anyone read anything about the up and coming Paper (thin) batteries ? Paper Batteries: A paper battery is a flexible, ultra-thin energy storage and production device formed by combining carbon nanotubes with a conventional sheet of cellulose-based paper.A paper battery acts as both a high-energy battery and supercapacitor, combining two components that are separate in traditional electronics. This combination allows the battery to provide both long-term, steady power production and bursts of energy. Non-toxic, flexible paper batteries have the potential to power the next generation of electronics, medical devices and hybrid vehicles, allowing for radical new designs and medical technologies.What do you think? Will it replace these monsters one day?

Posted by Goodhart 10 years ago


newly created Instructable not showing up in Recent section or search results

I recently posted this Instructable (https://www.instructables.com/id/12V-180kV-A-Battery-Powered-Marx-Generator-and-int/). However, it seems to have been caught in the filters like many others before it (I'm thinking the word "Communism" set off the alarms). I have looked over several other threads concerning this issue and all seem to have been handled. I figured I'd ask anyway because I have a few questions: How long does it typically take for a filtered Instructable to be manually approved? Will this affect the Instructable's approval for a contest that closes today? Will the Instructable appear at the top of the Recent section when it is approved or will it be offset? Thanks!

Posted by supercapacitor 3 years ago


Electrolytic vs supercap for CD spotwelder?

I need to make a cheap spotwelder to rebuild some battery packs(e.g,. welding thin nickel strips).My options are:(a) Try to find most of a farad at up to 25V or so on eBay. This could take a while. (Buying new electrolytics in the 0.1F range and above at these voltages is pretty expensive.)(b) Go for supercaps from Digikey (e.g). They've got some 5V 1F models for only a few bucks, and some "fast-discharge" ones for 10x more. Of course, if I go for more than 10V or so, I'll have to build some sort of charge-balancing circuit around the series caps, and I'd rather not unless it's really the best way to go--- though it might be as simple as a resistor in parallel to each cap.(c) Try one of these weirdo "digital supercapacitors" that are all over eBay for the crowd who fill their entire trunk with stereo amps. These look like they're rated at 1-5F at 13.8V and (I would hope) include some sort of charge balancer. Dunno if they're suitable for the sort of instant-discharge I want for a welder, though.I'm having difficulty figuring out:(a) How fast a discharge I need for a spotwelder anyway; I'm going to be using an SCR to trigger it and presumably want the lowest-inductance arrangement I can get, but are we talking milliseconds or microseconds?(b) What can I get out of a supercap? Milliseconds or microseconds? I haven't worked with supercaps before, and most people who seem to be designing circuits with them are using them as batteries.Other random questions:My reference design had 0.5 to 1F at 0-25V through a 600V 50A TO-65 SCR; whatworries me are things like http://www.avxcorp.com/docs/Catalogs/bestcap.pdf,whose page 3 shows that non-ultra-low-ESR supercaps (e.g., theaffordable ones) seem to have virtually no capacitance for pulsewidths of 10ms or less. (The BestCaps in that datasheet claimsomething like 60% of nominal instead, which is pretty good!)I dunno how narrow the pulse width needs to be to get good welds,but I'm guessing pretty narrow---for example, one guy claimed inhttp://www.philpem.me.uk/elec/welder/ that just the difference inputting the SCR on the low side and not the high side (so the triggerfor it didn't have to go through the wires, electrodes, and workpiece)worked a whole lot better, which implies to me that he might betalking microseconds. But I just don't know.]Of course, I also don't know whether I need 0.5 F at 10V or 1F at25V for the things I'm considering.Not to mention---the 50F caps at http://dkc3.digikey.com/PDF/T072/P1354.pdf(some of which claim ESR's of 0.025 ohm at 1kHz) have these skinny little0.5mm leads on them. How in hell would these leads not be vaporized if Icharged up the cap and then shorted it, as a spot-welder would be doing?(And sure, I could try to attach #4 copper wire to them---somehow---andsend that to the sharpened tips on my welding electrodes, but boy I feelsilly doing that---seems like whatever part of the cap's leads aren'tattached to the heavy wire will just evaporate when shorted, if they canreally dump that kind of current, even if it -is- just for milli-to-microseconds.)The Instructables site has some rambling about using supercaps for CDspotwelders, but it's just rambling---nobody who's actually built oneusing them, for example, or who seems to talk about discharge rates,etc.

Posted by HilaryGage 10 years ago