I need to use a piezo transducer to complete the circuit to a USB computer keyboard/ matrix.

So - for example - when the piezo is actuated (by being sent vibration) it "types" a letter into a text file

At the moment, when the piezo is connected to the USB matrix it vibrates as a buzzer - which I presume is because the USB voltage is actuating it.

This looks to be a similar idea:-

http://www.electroschematics.com/10166/piezo-trigger-switch/

However a) I do not need an LED or similar, and b) it would be handy if it could be actuated using the voltage from the USB bus

These would be the Piezos used:-

https://www.rapidonline.com/RVFM-AB...MIhpfUh8aW2AIV753tCh2A4A5XEAQYASABEgKM3_D_BwE

 

To check the other piezo thread -- Piezo Trigger Switch.

 

To check the other piezo thread -- Piezo Trigger Switch.

Thanks - I had a look.

So the circuit here should do the job? :-

https://forum.allaboutcircuits.com/threads/piezo-trigger-switch.98418/#post-735849

- I can just remove the LED component, and assemble the rest exactly as specified?

 

Thanks - I had a look.

So the circuit here should do the job? :-

https://forum.allaboutcircuits.com/threads/piezo-trigger-switch.98418/#post-735849

- I can just remove the LED component, and assemble the rest exactly as specified?

It can't be that easy and it should be use some other circuits.
Inside has many link that you can see in #2.
There is one of the link that you can play it with both keyboard and mouse as this.

 

It can't be that easy and it should be use some other circuits.
Inside has many link that you can see in #2.
There is one of the link that you can play it with both keyboard and mouse as this.

Thanks for the answer. I have had a look through that thread, and there appear to be a number of conflicting and different solutions, so it is not clear to me which one is suitable for my purpose.

I need to do this :-

- but without the LEDs

This seems to be fine for my purposes:-

https://forum.allaboutcircuits.com/threads/piezo-trigger-switch.98418/page-2#post-736464

- and I understand that you have tested it?