Supercapacitor Definition and 22 Threads

TL;DR Summary: I want to make a handcranked flashight with a supercapacitor, I need some help and thoughts about what type of capacitor do i need and how many to make suppercapacitor. the dc motor im going to use is a geared motor wich is; DC Gear Motor 12V 250RPM- SGM25-370 Specifications...

Hi all! I’m currently working on a project for which students will have to build a supercapacitor based dragster. I saw here and there some videos on how it works but it’s too general to give me hints about components choice. So here I am with my questions, hoping that I’ll get enough answers...

What is the fastest circuit to charge a supercapacitor?? could you show me??

Anyone on this site that happens to be a supercapacitor expert? I'm looking for a real supercap genius. I see a lot of "super capacitor" parts for purchase online from various sources like Digikey and Mouser but what I don't see is an informative guide on how to figure out what type is the...

I'm doing a project where I need to hand power for dc motor (12V or 24V) and charge a super capacitor, and then use it to drive another 48V dc motor. I want to know which Super capacitor will be suitable? Please give suggestions for Super capacitor specifications for both 12V and 24V that will...

I have a supercapcitor to power some of my small projects. The only problem is that the voltage drops gradually, unlike a lithium ion battery, in which the voltage is mostly stable throughout. My boost converter that I am using to boost the voltage up to 5 volts, stops working with an input...

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...

Can a supercapacitor be a power supply?

Greetings. I started a new project, I am trying to establish a basic fabrication method so I can test different common household electrolytes when placed between two activated carbon electrode. https://drive.google.com/file/d/0BwO5zSDThdxFazQyeHM5ZFVEdDg/view?usp=sharing The main problem I am...

Hey guys, Currently I am trying to build a low tech super capacitor based on the working the principle. Right now I am using a single beaker with two aluminium foil positive and negative electrodes with an electrolyte of 6M NaCl solution. The power source is a new-ish triple-A battery running...

What is the F/cm^2 for a commercially available supercapacitor? Much of the literature is on newer types of carbon, such as graphene, but are commercially available supercapacitors based on activated carbon? http://www.pnas.org/content/suppl/2015/03/22/1420398112.DCSupplemental In this article...

I have supercapcitor 2.7V, 350F. I want to charge it by 0.001mA 20V power source. Is it safe? Thanks you!.

Hi all, My friend and I have created a homemade supercapacitor. It can power a LED light and small alarm clock. We charged it up to 1.5 Volts. I was wondering if anyone knew how to find the exact capacitance in Farads, any help will be appreciated. I have added the steps that we have taken in...

In battery we have (in ideal) case one electron per atom or three elecrons (in case of aluminum) which flow from anode to cathode.In activaded carbon there should be immensely smaller amount of free electrons than in metals.I do not have exact date for carbon, but for example in Germanium it is...

I have had a question on my mind for a while now. Would it be possible to make a graphene supercapacitor using the scotch tape method for making graphene? Except unroll the entire roll of tape and cover it in graphite and then press it against another entire roll of scotch tape, peel off and...

Is it safe to charge a supercapacitor from a source with more than it's rated voltage, provided that the voltage across the cap never exceeds the rating? For example, the cap is rated at 2.7V, and i charge it from two AA batteries giving just over 3.2V in open circuit. Once the battery...

I need to design an electric circuit which require PWM to let the battery and supercapacitor take turn to supply current to the loads. stage1: battery charge up supercap and supply current to the load stage2: supercap voltage increase to a certain level, battery current is cut, supercap...

Greetings. Where can i read about safety and failure modes of supercapacitors? What kind of currents would be safe, if not marked? What would happen if that current is exceeded? What would happen if a charged SC gets short-circuited, briefly or for a while? Can anyone help, by...

Energy density of supercap is equal to square of it`s voltage. Is it possible to join together advantages of supercaps and high voltage capacitors such as Ferroelectric caps? What prevents to use high-k materials in supercaps?

I am familiar with changes that occur with capacitance and ESR when you connect supercapacitors in series or in parallel. My question is along those lines, but the answer is elusive to me... From schematics I have seen about supercapacitors imbedded in circuitry, the supercaps always have...

The Lead Acid Battery in my H-D '09 FXDF is rated 12V at 19Ah. If I understand the math correctly, I would need a 12V capacitor rated to 5,700F. Is this accurate? 1 F = 1 As/V 1 Ah = 3600 As 19Ah x (3600As/1Ah) = 68,400As (68,400As/12V) x (1F/[1As/V]) = 5,700 F As I understand it...

hello! i would like to ask for your opinions. i have tried using supercapacitor in my circuit to prolong its battery run-time. I have attached a simple circuit design for your reference. the problem is that the load drains the supercapacitor faster than the battery charging the supercap...