273-073 piezo update

As stated in the previous blog post, yesterday the Radio Shack piezo, part number 273-073, was shorted the entire day across the Keithley meter while measuring the DC current. BTW, the piezo was already appreciably disturbed prior to yesterdays measurements. Initially the piezo produced a relatively large amount of DC current, but within hours decayed to about 10 pA where it stay for a good part of the day, and then quickly dropped well below 1 pA.

Today, the 273-073 piezo started off with about 14 pA, and has been slowly oscillating between that and 0.7 pA. It could be getting ready to jump to a lower energy level.

Interestingly enough, the 10 pA has made itself known to the piezo's as well! What is with 10 pA? Is it some Universal constant, perhaps an unknown Universal flow? I think the 10 pA represents the stabilized constant current, and will probably not be used on commercial batteries. Both the diodes and piezo's have shown that they produce hundreds to thousands and possibly more times more DC current when recovered. So it makes sense to never allow the components to get down to the 10 pA level. Such components should go through a cycle of load/unload. The the current reaches a certain point, it would be best to unload the component to allow it to recover.

IMO, the idea of placing components in paralleling and in series will not be necessary in the end for a retail product. Simply one large component should work. What the data seems to show is that regardless of how large the component is, or how many are in parallel or in series, it will eventually reach the 10 pA level, but that does not mean that larger units will not produce more *initial* current than a smaller unit. Don't get me wrong, placing diodes in-series was vitally important, as it brought the DC voltage levels high enough for instruments to easily detect the DC voltage to prove the concept.

I'm getting enthusiastic to receive my fancy MCU board, which is loaded with goodies such as 3-axis accelerometers -->

http://www.sparkfun.com/commerce/product_info.php?products_id=8298

This board has built in SD card, which will allow for long term data logging, pretty much as long as needed. Then we'll start seeing some data logging. The crystal elements (piezo's and such) will be inside the first metal shield, going to the small electrometer chip, which will probably go to an optocoupler. The output wires of the optocoupler will go through a small pin hole in the shield, which will go to the data logger. The data logger will be inside the second metal shield.

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