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

David Reeves drreeves at gmail.com
Thu May 16 00:40:28 UTC 2013


'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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