Well someone made just what I wanted to make... just proves my idea was good...
they use 120Hz, even lower then my 180Hz piezo:
http://www.extremetech.com/computing/155102-energy-harvester-that-creates-power-from-ambient-vibrations-finally-comes-to-market
That's what I am talking about! good reply!
I do like to try things and I do have some access to a spectrum analyzer and the telescopic tube is a very neat idea. I searched for some low power LEDS(a common one is 20mA ~2Vdc) but can't seem to find one I can buy here.
basically I've tested my...
thanks you, your reply was one of the best and to the point and supports my claim that electric amplification is useless here(as I already said):
that's why I wanted PASSIVE amplification from the beginning...
again by passive I mean concentrate the sound using a non-powered structure(we...
Well I can't give you numbers because I don't know them, I don't have a measuring device.
I said that I want ambient sources like street noise, here's a list of sources and their SPL in dB:
http://www.engineeringtoolbox.com/sound-pressure-d_711.html
this is also good...
Well I have not been a 100%, so here is the general question about the device I want to build:
1) How to do I get maximum response from my 180Hz piezo transducer from any source or energy - acoustic or vibrational.
2) keep the size of the structure/object we are designing as small as possible...
The device I am working on is to find a source for 180Hz not to harvest it - it doesn't include the harvesting circuit it includes the MONITORING CIRCUIT - so NO I did not deceive I am trying to concentrate 180Hz sound or vibration, other parts of the device are irrelevant - microphone, energy...
I read many articles about many others who have done the same and these applications are on the rise and I want to make my own - this is not doomed from the beginning it has been done and I can't keep track of all the places I just want something on a small scale that is portable and practical...
Thats what I am looking to see if the street is a good source for energy.
Yes I agree that there is no room for improvisation here but I like to try things and get a feeling of them so I learn and remember my mistakes.
I understand the law of energy preservation and I don't expect to create...
Wow nice reply I will need time to go over this and yes I do mean concentrate and not passively amplify - I am not familiar with acoustic engineering lexicon :)
found very practical info here:
http://en.wikipedia.org/wiki/Acoustic_resonance#Resonance_of_a_sphere_of_air_.28Vented.29
I have another idea that is possible with the piezo - I attached to a simple fan so it only touches it barely and I got some response now if I could build a small fan that the wind spins and that vibrates at 180Hz I can get some response from the piezo. I know I am talking about wind and not...
Do you also remember my small size requirement?
I have an A/D, micro-controller and a serial-to-usb module take space along with the piezo(by the way it is possible to lower it's res freq - by adding mass to it according to its datasheet) itself that needs to be inside too. also the solar cell...
Well I plan on using a tiny solar cell(maybe a bunch in parallel to increase current) to power it if this answers your question about the power consumption.
I have experience with A/D converter and made 3 working projects one with A/D, D/A, a microcontroller and FPGA working together in the same...
It needs to be a low power device - portable and possibly battery operated so less active amplifying means less power. The voltage the piezo will output goes into a circuit that converts the voltage to a DC voltage relative to the amplitude of the sound wave and then A/D converter sends this...
That means tearing apart my sub-woofer...
and some detail about what I plan to do:
Well the piezo speaker is going to "monitor" the presence of a 180Hz audio wave if I place it in a certain location. For example if I place it in near my living room's window for 1 day I can see how much 180Hz...