[Blabber] Boosting the voltage from a lemon juice battery.

Guan Yang guan at yang.dk
Wed May 15 21:35:04 UTC 2013


No, I'll be around tomorrow night.



On Wednesday, May 15, 2013 at 17:16 , Matthew Duepner wrote:

> Ok. Are you going to be at the space at all tonight since I wouldn't even know where to begin looking.
> On May 15, 2013 5:07 PM, "Guan Yang" <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > You want a high voltage rating and as small a capacitance as possible, because you need a lot of energy to charge a large cap up. Something in the picofarad range. We probably have some around that are meant for loading a crystal. 
> > 
> > On Wed, May 15, 2013 at 5:05 PM, Matthew Duepner <matthewduepner14 at gmail.com (mailto:matthewduepner14 at gmail.com)> wrote:
> > > I think so. I will try to execute this when I get home. Is there any specific cap I should use? I 
> > > On May 15, 2013 4:59 PM, "Guan Yang" <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > > > Yes, capacitors don't tend to self discharge very fast.
> > > > 
> > > > Do you understand the circuit? You have two caps, C1 and C2, and an endless sequence of lemon batteries, B1, B2, B3, etc.
> > > > 
> > > > Connect B1 to C1 to charge it up.
> > > > 
> > > > Now connect B2 in series with C1. The two in series have a higher voltage. Connect to C2 to charge that.
> > > > 
> > > > Now connect B3 in series with C2 to top up the charge of C1. Etc. 
> > > > 
> > > > The only thing I can think of is a diode to prevent any charge from going back. My favorite solution for this these days is a P-channel MOSFET. You want the current to go from drain to source. Short the gate to ground to open up the MOSFET. 
> > > > 
> > > > On Wed, May 15, 2013 at 4:55 PM, Matthew Duepner <matthewduepner14 at gmail.com (mailto:matthewduepner14 at gmail.com)> wrote:
> > > > > Would I need only two caps or are more components needed. And would the cap discharge slowly enough to be measured with a multimeter? 
> > > > > On May 15, 2013 4:40 PM, "Guan Yang" <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > > > > > You might actually need two caps to carry the charge "forward" in your scenario.
> > > > > > 
> > > > > > On Wed, May 15, 2013 at 4:39 PM, Matthew Duepner <matthewduepner14 at gmail.com (mailto:matthewduepner14 at gmail.com)> wrote:
> > > > > > > Could you use the lemons to charge a higher voltage cap, which when discharged would output a greater voltage? 
> > > > > > > On May 15, 2013 4:26 PM, "Guan Yang" <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > > > > > > > Then I would just try tons of lemons in series. Maybe try different fruits to find the highest voltage per volume. Lime?
> > > > > > > > 
> > > > > > > > On May 15, 2013, at 16:19, Matthew Duepner <matthewduepner14 at gmail.com (mailto:matthewduepner14 at gmail.com)> wrote:
> > > > > > > > 
> > > > > > > > > awesome. I do want her daughter to understand and I also don't want it to look like I did the project for her. So nothing to complex. The fewer the components the better 
> > > > > > > > > On May 15, 2013 4:15 PM, "Guan Yang" <guan at yang.dk (mailto:guan at yang.dk)> wrote:
> > > > > > > > > > Well if the goal is solely to generate a high voltage, there are tricks. Special flyback transformers, I have a few. You could potentially have hundreds of volts. (But again, very little current!)
> > > > > > > > > > 
> > > > > > > > > > On Wed, May 15, 2013 at 4:13 PM, Robert Diamond <rmd6502 at gmail.com (mailto:rmd6502 at gmail.com)> wrote:
> > > > > > > > > > > Joule Thief - the more windings to the coil, the higher the voltage!
> > > > > > > > > > > 
> > > > > > > > > > > 
> > > > > > > > > > > On Wed, May 15, 2013 at 1:10 PM, Matthew Duepner <matthewduepner14 at gmail.com (mailto:matthewduepner14 at gmail.com)> wrote:
> > > > > > > > > > > > My chem teacher recently asked me if I would be able to help her make something that is like a battery but not a battery. I suggested super caps of course, but later found out that it needs to be something her daughter can make since it is part of one of her homework assignments. I suggested making a lemon juce battery. I also said I would look into ways of increasing the output voltage with electrical components since the goal of the exercise is to see who can construct a battery that generates the highest voltage. I have a few ideas but was wondering if anyone had any suggestions that would not be too complex. Sorry for the long email, but I thought the story was worth sharing.
> > > > > > > > > > > > -Matthew 
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