Schematic review: piezo harvester/ultrasonic transmitter

[brimsant]

Hi,

I'm trying to build a project where I am trying to power a ultrasonic transmitter from a piezo element. Can someone take a look at my design and see if there are any issues/will work?

Two piezo elements will be connected, one to the rectifier and the other to the harvester IC. There should be a built in threshold on the IC that discharges when the voltge reched 3.6V.

 

[alec_t]

Which ICs are you using?
What is the proposed use for that bridge rectifier?
The bridge rectifier is short-circuited.
Please give all your components designators so the we can refer to them.

 

[brimsant]

Which ICs are you using?
What is the proposed use for that bridge rectifier?
The bridge rectifier is short-circuited.
Please give all your components designators so the we can refer to them.

The harvester IC is LTC3588EDD-1#PBF
I am using BAT43W diodes for the rectifier, its supposed to rectify the voltage generated by a second piezo that in addition to the one attached to the IC


I'm using the NE555 for the 555 timer

 

[Tony Stewart]

What drive and leakage current levels do you expect? The best 555 is the

ICM7555CBAZ-T at 60 uA​