there is 0.1v across the piezo when its beeping.

0.1VDC, AC, peak-to-peak, or RMS?
What meter setting did you use? Or was that measured on an oscilloscope?

 

0.1VDC, AC, peak-to-peak, or RMS?
What meter setting did you use? Or was that measured on an oscilloscope?

just on a cheap dmm voltage setting.it was going up and down, just like the currentwas all over ther place,
so probably peak to peak ?

 

I think he just wants to time the operation a 9 Volt device (or maybe higher) using a kitchen timer.

yes , just turn something on, and then i can turn it off when i want. just 9v circuit

 

just on a cheap dmm voltage setting

AC or DC voltage setting? (There might be a DC offset/bias.)

 

yes , just turn something on, and then i can turn it off when i want. just 9v circuit

I am sceptical.
Why not turn the device on and off manually with a switch?
Use the kitchen timer or any other timing device.

 

I am sceptical.
Why not turn the device on and off manually with a switch?
Use the kitchen timer or any other timing device.

i want to turn things on after a set time.
i would have thought it was simple to electronics guys but it seems it isnt

 

AC or DC voltage setting? (There might be a DC offset/bias.)

dc voltage setting just basic dmm
on current ma setting it was going up to 60ma and all over the place

 

i want to turn things on after a set time.
i would have thought it was simple to electronics guys but it seems it isnt

It's not difficult. Just wondering why. And without enough information as to how the piezo is driven we really can't give you a conclusive answer.

dc voltage setting just basic dmm
on current ma setting it was going up to 60ma and all over the place

Since a piezo is an AC device with a frequency possibly in the 10's of thousands of hertz, a simple meter set to AC "MIGHT" and "MIGHT NOT" give you an accurate reading. However, on DC - you're going to see things flying all over the place with regards voltage since most meters sample rather than read out a continuous reading.

 

i want to turn things on after a set time.
i would have thought it was simple to electronics guys but it seems it isnt

It is simple electronics but your approach is making it more complex than it needs to be.

Tell us the length of time desired. Is it seconds, minutes, hours? What resolution and accuracy is required?

 

It is simple electronics but your approach is making it more complex than it needs to be.

Tell us the length of time desired. Is it seconds, minutes, hours? What resolution and accuracy is required?

it could be seconds , minutes or hrs, whatever i want at the time.
this is simply set on the kitchen digital timer.
just want to use the output to the piezo?transducer? to trigger another circuit at 9v,
which i will turn off manually when i want.
this should have been clear from my initial post but maybe not.

 

it could be seconds , minutes or hrs, whatever i want at the time.
this is simply set on the kitchen digital timer.
just want to use the output to the piezo?transducer? to trigger another circuit at 9v,
which i will turn off manually when i want.
this should have been clear from my initial post but maybe not.

It is clear in your initial post what you are trying to do.
It is also clear to us that a kitchen timer is not designed to do what you are trying to do.

There are digital timers on the market that has relay switch contacts for output.
As an example:
https://www.amazon.co.uk/dp/B07KPZVKPM/ref=sspa_dk_detail_1

 

Try measuring the piezo voltage with your meter set to AC Volts. You should get a better indication, but probably not accurate.

 

What is this 9V gadget you are wanting to switch on?

 

It is clear in your initial post what you are trying to do.
It is also clear to us that a kitchen timer is not designed to do what you are trying to do.

There are digital timers on the market that has relay switch contacts for output.
As an example:
https://www.amazon.co.uk/dp/B07KPZVKPM/ref=sspa_dk_detail_1

ah, many thanks for that link, i believe 12v versions are available so maybe that would be better and more suitable.
i think you have found me a solution
many thanks