Two days ago I tested the Ultracapacitor by slowly charging it at ~ 22mA, and quickly discharging it starting at over 400mA. Here’s the results. This method of slow charge, fast discharge did not show COP>1. The final voltage after charging the UC was 374.1mV, took 40.383 joules, and the charging current was a bit over 22mA. After discharging the UC at a max current well over 400mA, the final result is that 3.265 joules was lost in the entire charge/discharge process, thus making this UC 91.9% efficient, which IMO makes it one amazing capacitor.
After watching this experiment all day, the amazing main effect I’ve observed over the past week appears to be dielectric absorption. There might be other main effects. Who knows until one investigates. As is seen in the charging data, the UC change in capacitance was a minor effect, as expected and as seen in last weeks measurements. After doing some hand calculations, it turns out the UC capacitance hardly changes under low charging currents. When the current appreciably increases, thus internally heating the UC, the measured capacitance increases at an alarming rate.
Here’s the entire UC data logging measurements compress into a screen shot. This is a new feature to the data logger software, to display all of the channel data on one screen.
The spikes in current toward the end was me adjusting the MOSFET gate voltage to get more discharge current. They may seem like spikes in the snapshot, but actually I did not quickly change the current.

Although the graph in the previous post does not show capacitance, I manually calculated the UC capacitance at various points throughout the entire charging period from 0V to 374mV, and the capacitance hardly changed after the UC warmed up. What an awesome capacitor!
Here’s the circuits. Hopefully there’s no mistakes in the drawings.
Remember, the pins shown in the parallel port photo are as it appears directly from your computer, *not* from the cable. So you’ll have to do some mirroring to figure out the correct pins.
The top circuit is what I used to measure the voltage directly across the UC. The 2nd circuit I used to measure the UC current during the charging phase. The 3rd circuit I used to measure the UC current during the discharging phase.
You can place the op-amp resistors to meet your requirements, depending how much gain you would like. Or if only need a 1-1 input from 0 to +5V, then you don’t need to op-amps and you can go directly to the ADC chip.
You can use your favorite op-amps. I have a zillion op-amps, and it’s funny to me because the LM741 worked just fine.
I used 12V for V+, and -12V for V-. And +5V for the ADC0809 and 555 timer. BTW, you could easily get a much much better ADC for probably the same price, but this is the only one I could find at home. Somewhere around here I have a very expensive 170MHz 12bit ADC, but can’t find it.
People can request the software exe file via email. That way I can always email them an update if there’s a bug or additions. Give me a day to make sure it works on non MS Visual Studio PC’s who might not have the required DLL’s since it’s not a static DLL build.

