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Persistent buzzer

jcrowe

Nov 17, 2021
1
Joined
Nov 17, 2021
Messages
1
Hi everyone. I'm not an engineer so forgive me if I'm making a hash of this. I'm working on a project with my middle school son where we would like a piezo buzzer to sound for a specific period (2-3 seconds) when initially activated a) after the circuit is broken and b) even if the circuit is closed. The buzzer we have is 9mm x 5.5mm connected to a Triple-A battery, and a switch (we're making this). Is there some other component that can be introduced into the mix to achieve the desired result? Thanks a million for your help.
 

Nanren888

Nov 8, 2015
623
Joined
Nov 8, 2015
Messages
623
What sort of components are you familiar with?
Google latch or transistor latch, or scr latch, or mosfet latch.
You will see a range of circuits including breadboard examples.

The single AAA battery is quite a low voltage to use as a supply.
For latching an SCR, relay or a couple of transistors are obvious choices. You'll need to put them on some form of board.
Some 555 timers may operate down there. A transistor circuit design is possible. You might find a relay that operates down to the voltage.
 
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