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Electronic Siren problem

jepoy12

Aug 19, 2011
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Aug 19, 2011
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Hi everyone.
Can you help me figure out whats wrong with this circuit?
I tried making it on my breadboard but its not working.
Op-amp-siren-sound-using-ic-741.jpg


need your help guys.
thanks!
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Chances are that it's not the circuit, it's your construction that's at fault.

What faults are you seeing?

Is anything getting hot?

How much current is drawn before you press the button, and then while you press it?

Do you have some clear photos of your breadboarded circuit?
 

shrtrnd

Jan 15, 2010
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Odds are that *steve* is right.
When rechecking your wiring, do not assume simple connections are correct.
Carefully recheck every connection.
If you still can't find a problem, recheck your pin-outs on the transistor to make
sure it's installed correctly. Also the LM324.
If you think everything is right, you may have blown the transistor or IC, and they
need to be replaced.
 

jepoy12

Aug 19, 2011
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btw instead of using the LM324 I change it to lm741 and I use two of it.
 

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  • Op-amp-siren-sound-using-ic-741.jpg
    Op-amp-siren-sound-using-ic-741.jpg
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(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Great, so you have it working then?

I'll close the thread.

Congratulations.
 

jepoy12

Aug 19, 2011
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No its not working. I dont know why? I already check my wirings and all are correct.
 

jackorocko

Apr 4, 2010
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Have you checked to make sure your lm741 swap out was a direct and exact replacement for the lm324 without modification to the circuit?

I would also like to see a picture of your breadboard layout.
 

jepoy12

Aug 19, 2011
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Aug 19, 2011
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its exactly the same as this pic. I already check it like 10x and I'm really sure that all the pins are on correct connection.
2779d1317993557-electronic-siren-problem-op-amp-siren-sound-using-ic-741.jpg
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Let me tell you something for free. It doesn't matter how many times you look at a circuit, you still may overlook something obvious to someone else.

We only have so much time and so much patience.

I asked you a number of questions that you didn't bother answering, and thus the only information we have is the rather useless "it doesn't work".

If you can't give us any more information, then we can't give you any answers.

Oh, and telling us where you found the circuit would help too.

In summary (and I'm not going to spend any more time on this issue until you can supply most or all of this):

1) What faults are you seeing?

2) Is anything getting hot?

3) How much current is drawn before you press the button, and then while you press it?

4) Do you have some clear photos of your breadboarded circuit?

5) Where did you find this circuit?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Can you let us know what the problem was?

How well does the circuit perform?

Perhaps someone in search of a siren will find this thread and you can help them.
 

KJ6EAD

Aug 13, 2011
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He probably had a diode or capacitor in backward and is too embarassed to admit it. :p
 

davelectronic

Dec 13, 2010
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Siren circuit

Bit harsh guys, although a description on the finished result would have been nice, as you say others could have learned from it. And its all to easy to make circuit mistakes, result often wrecked components, but yes unless the description of the problem is accurate, or pic's and update of current progress is given i guess it makes any would be help limited or not possible.
Dave.
 
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