I took it out of the circuit that I am building just to see if it worked and I can't get to buzz. I am putting 6v dc directly to it and not a peep.
I tried to upload the data sheet so maybe it didn't work. It is a SEP-1172.
Hmmm the preview shows it as an attachment.

 

Looks like you need to build that little driver.

 

yep...

that is just piezo element, you need to add transistor and two resistors as per schematic in that file.

 

Hello,

There is a schematic in the given datasheet:



Bertus

 

Hello,

There is a schematic in the given datasheet:

View attachment 141597

Bertus

Amazing stuff. As you suggested, I wired that schematic and it is now close to being complete. At least the buzzing side works when I cover the sensor.
But I struggled quite a while with it for this reason.
Primarily I was confused because in the exercise circuit the --- negative ( ground ?) from the battery goes directly into the schematic.
However !
In the buzzer circuit, the --- negative ( ground ?) from the battery goes into a 1k resistor. So how the heck do I marry them together ?
I fought through these kinds of logics ( illogic !)
1) Can I keep them separate ? I think not.
2) Do I need the buzzer --- to be a sub set of the exercise?
3) Or can I use the buzzer --- for the whole thing ?
I think that I went with option 3 but I will have to check later. I was so darn happy that it worked that I called it a day. And I was a bit proud of myself.
Tomorrow I will do the IR bit.

But this begs the question of how do you wire something like this ? Where some of the connections are to buzzer ground whereas others are to, hmmm, (whole ground ? ) .
I don't know how to phrase it except that the buzzer seemed to be getting part of something rather than the whole something, whatever something is. Volts, amps, another, ?,.
Maybe I should post this as a different thread.

Again, many thanks
George KG5TKY