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

Robert Diamond rmd6502 at gmail.com
Thu May 16 00:56:50 UTC 2013


Well, you can't make lemonade with sweetener, but you can make a battery
with zinc and copper!


On Wed, May 15, 2013 at 5:40 PM, David Reeves <drreeves at gmail.com> wrote:

> 'When life gives you lemons, make a charge pump'.
>
>
> On Wed, May 15, 2013 at 7:09 PM, Matthew Duepner <
> matthewduepner14 at gmail.com> wrote:
>
>> Thanks for all the help
>>
>>
>> On Wed, May 15, 2013 at 5:44 PM, Guan Yang <guan at yang.dk> wrote:
>>
>>> If you look in the big parts boxes on the eastern wall near the
>>> bathroom, there's a tray called through hole capacitors. Try to see if you
>>> can find anything in the nanofarad or picofarad range there.
>>>
>>> Otherwise you'll need to dig pretty deep in my box (box 13). Somewhere
>>> you'll find a small ziploc bag with a DIP tube, that contains in ATtiny2313
>>> and a crystal. There should be some 22pF and 27pF capacitors in there,
>>> Digi-Key part numbers 445-4763-ND and 445-4719-ND.
>>>
>>>
>>> On Wednesday, May 15, 2013 at 17:41 , Matthew Duepner wrote:
>>>
>>> > Any idea where they might be at Hack Manhattan
>>> > On May 15, 2013 5:35 PM, "Guan Yang" <guan at yang.dk (mailto:
>>> guan at yang.dk)> wrote:
>>> > > 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) (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) (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) (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) (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) (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) (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) (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) (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) (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) (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)
>>> (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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