Problem with device (sound to electrical energy)

[Hyper6372]

I need help with my device, I have built the device though it is not working. Below I have piezoelectric disks, AC to DC converter (full bridge rectifier) and a DC - DC boost convortor and the output is a light bulb, what is the issue ? Here are the links to the items: Dasiter 5pcs AC-DC Converter AC... https://www.amazon.com/dp/B08BK7MKK1?ref=ppx_pop_mob_ap_share, Legrand-Pass & Seymour 8052CC10... https://www.amazon.com/dp/B000BPEDZC?ref=ppx_pop_mob_ap_share, Cheerock Pack of 20 Piezo Disc,... https://www.amazon.com/dp/B0BY6P3X89?ref=ppx_pop_mob_ap_share, MakerFocus DC to DC Boost... https://www.amazon.com/dp/B0D2K62W2S?ref=ppx_pop_mob_ap_share

 

[MintJulep]

I'd say your problem starts with unrealistic expectations.

 

[waross]

It's hard to make a statement strongly enough to light a light bulb.
How much sound energy are you starting with? (Even before considering the % efficiency of your sound energy to electric energy conversion.)

 

[3DDave]

The piezoelectric effect produces voltage, but not much current. Light bulbs need a lot of current and not much voltage. It's not a good match.

Look at piezoelectric spark igniters. They produce thousands of volts at milliamp currents.

Using an audio speaker would be a better match to capture sound energy.

 

[GregLocock]

Energy 'density' of sound is very low. 94 dB is quite loud and is a flux of 1W /m², and your microphone/loudspeaker is not very efficient.

 

[waross]

Using an audio speaker would be a better match to capture sound energy.

What Dave said!

 

[MintJulep]

Just for scale:

A single piezo element produces voltage of a few milli-Volts and power of a few milli-Watts.

If we assume 5 mV, then you'd need a thousand elements in series to get a 5 Volt input to the rectifier.

Those thousand elements might generate a Watt.

So, 10 strings of a thousand elements might get you 10 Watts, maybe enough for a small lightbulb.

Good luck!

 

[IRstuff]

It appears like you did zero research for this project. I Googled "piezoelectric microphone output voltage" and got Power Harvesting Using Piezoelectric Shoe For External Power Storage which I suggest you read before proceeding further.