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  • 555 Astable Siren

    djkross

    djkross

    @djkross-89s5Wb
    Updated: Dec 23, 2007
    Views: 891
    hey, guys. i've just built a siren for a project i'm doing and i'm kinda stuck.basically what i've done is use 1 monostable 555 to control the output of the 2 astable 555's by using a switch button. to turn it on and off (with variable longevity of siren noise). where i'm stumped at is... if i'm going to control this thing using a PIC, i have to replace the switch button because we're going to send a signal to the siren in order to fire it. so...

    1) How exactly do I do that? It's been a while since I last messed with micropressors!! I honestly have no idea for this one... I need something that'll act as a switch... I know that much...

    2) If I want to amplify the output to say... 50-60dB, how would I do that? Anybody know of a amplifier chip + schematic that could help me achieve that?

    Thanks in advance! I hope you guys have loads of ideas! 😁
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  • djkross

    Member • Feb 15, 2008

    no replies?
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  • reachrkata

    Member • Feb 23, 2008

    From what I have understood of your short explanation -

    1) You can use a transistor as a switch and use a controller port to drive the transistor.

    2) Transistor amplifier again !!

    I suggest that you share your schematics so that we all can get a better idea.

    Karthik
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  • sauravgoswami

    Member • Feb 26, 2008

    Hi...you can use a simple relay and connect them to your switch or replave it with a relay,as for amplifier you can definately go for op-amp,i can help u with the schematics,but were shud i e-mail u.....and giveme a weeks time for that!!!

    djkross
    hey, guys. i've just built a siren for a project i'm doing and i'm kinda stuck.basically what i've done is use 1 monostable 555 to control the output of the 2 astable 555's by using a switch button. to turn it on and off (with variable longevity of siren noise). where i'm stumped at is... if i'm going to control this thing using a PIC, i have to replace the switch button because we're going to send a signal to the siren in order to fire it. so...

    1) How exactly do I do that? It's been a while since I last messed with micropressors!! I honestly have no idea for this one... I need something that'll act as a switch... I know that much...

    2) If I want to amplify the output to say... 50-60dB, how would I do that? Anybody know of a amplifier chip + schematic that could help me achieve that?

    Thanks in advance! I hope you guys have loads of ideas! 😁
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  • djkross

    Member • Feb 26, 2008

    is there a siren/speaker i can use with an amplifier already installed in it?
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  • sauravgoswami

    Member • Feb 26, 2008

    Dude,there are lot of ways u can control your 555,which is suitable for your application can be determinrd only after seeing ur ckt diagram,u may have to make changes in your code too


    djkross
    hey, guys. i've just built a siren for a project i'm doing and i'm kinda stuck.basically what i've done is use 1 monostable 555 to control the output of the 2 astable 555's by using a switch button. to turn it on and off (with variable longevity of siren noise). where i'm stumped at is... if i'm going to control this thing using a PIC, i have to replace the switch button because we're going to send a signal to the siren in order to fire it. so...

    1) How exactly do I do that? It's been a while since I last messed with micropressors!! I honestly have no idea for this one... I need something that'll act as a switch... I know that much...

    2) If I want to amplify the output to say... 50-60dB, how would I do that? Anybody know of a amplifier chip + schematic that could help me achieve that?

    Thanks in advance! I hope you guys have loads of ideas! 😁
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  • djkross

    Member • Feb 26, 2008

    [​IMG]

    diode 5 is an LED.
    R8 is the speaker.
    R11 is wired to RB7 of the PIC.

    we have the code working to trigger the siren. all i need now is a speaker with an amplifier built in it 😔
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  • sauravgoswami

    Member • Mar 4, 2008

    hey buddy,hope ur doing well,as for ur prob.Do one thing use ULN 2003 IC which is CMOS to TTL converter,use the output of ULN 2003 to triggre the base or Transistor,which can be used as a switch for your 555,do ask me if u have any issues...good bye
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