Hello,

I am a student and I was wondering how I can make a simple circuit for making a one beep (not constant) after pressing a push button,
like when we are typing on our cell phones!
I would also like to use CR927 battery (3V) and a piezo buzzer.
Is it possible?

Thanks!

 

Likely.
But the design depends upon how much current the buzzer takes.

 

It is possible. Maybe a 7555, cmos version of 555, 2N3904 to drive piezo buzzer, + resistors & cap.
At 3 V buzzer will not be very loud.
From All Electronics, 3-18 VDC PIEZO BUZZER, FY14-G, 80 db @ 12V, 7 ma, CAT # SBZ-204, US $ 1.49.
Or add another 7555 & speaker

 

Welcome to AAC!
Is this a school/college project?

 

I would look at the CMOS monostable IC CD4538 (or HEF4538) and possibly combine with a few other CMOS ICs.
They will work down to 3V supply and like most CMOS ICs use very little supply current when static (nothing changing). So good for coil cell operation.
See:- https://www.st.com/resource/en/datasheet/cd00000410.pdf
Easy to use the 4538 to generate a fixed length pulse on an input change. This can drive a small buzzer or control an oscillator (created with CMOS gates) that will drive a piezo speaker.

 

Hello,

I am a student and I was wondering how I can make a simple circuit for making a one beep (not constant) after pressing a push button,
like when we are typing on our cell phones!
I would also like to use CR927 battery (3V) and a piezo buzzer.
Is it possible?

Thanks!

Hi,

Here's an idea...

1. Use a momentary contact normally open pushbutton.
2. Press the button for the time you want it to beep.
3. Then let go.

 

there are a list of conditions you need to fix before starting with the design :

• idle power draw --versus-- "wake on press"
• duration of the beep
  • should it ring until the button is released
  • constant time on
    • what happens when there is multiple presses during sound.ON -event/-condition
    • ? maybe more
• volume loudness/frequency of the beep
  • it's possible to buffer energy from cell button to capacitor for extra sound power -- such disables "too frequent" presses
• start delay (if any)
• physical space avail for the circuitry
• ? etc. . . .

 

Simple circuit- low V piezo buzzer, 2- 10k resistors & capacitor. C- 5 to 25 uF. Works fine @ 12V, 5 uf, Mallory SONOLERT, & 2-10k Rs.