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Beep once Circuit

Sree

Dec 11, 2015
17
Joined
Dec 11, 2015
Messages
17
Hi
I am once again
Now I need a help using a 555 ic
I have a circuit with 555 ic, that will give an output through pin3. The output time can vary using a variable resistor.
The actual problem I am facing is- I really need a single beep after 15 seconds. But after 15 sec. delay the output is giving a long beep of seconds duration. (I really want a beep of fraction of seconds)
Give me your valuable advise (Please remember that I have very limited knowledge on circuits)
 
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Sree

Dec 11, 2015
17
Joined
Dec 11, 2015
Messages
17
Instead of R4 & led2, a beeper directly from pin 3 to ground. Instead of 10K, a 100K VRLED-flasher-circuit.png
 

Alec_t

Jul 7, 2015
3,587
Joined
Jul 7, 2015
Messages
3,587
Try these changes:
R1=10k
C1=220u
Forward biased diode across R2 (100k).
 
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