New Guy Here - Wanting to build Siren

Discussion in 'The Projects Forum' started by Jasonb61, Jul 31, 2008.

  1. Jasonb61

    Thread Starter Member

    Jul 31, 2008
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    Hey everyone, I just stumbled upon this site and I had to sign up right away. I have a little self-taught knowledge of electronics and circuits. Most of my interest came from doing car wiring. Anyways, really quickly... I am wanting to put together an alarm siren (for fun really) and I was wondering to play around with different tones and pitches... Maybe someone has a link more specific to this or something? I took apart one of the sirens that changes tones from like a police siren to everything else and I would like to put together something like that. Anyways, time for bed. Sorry for being so quick. Later
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    Hi Jason,
    Have a look here:
    http://www.redcircuits.com/Page5.htm
    Pretty simple, uses just one CMOS 4093 IC and a transistor with some other parts.

    Instead of the BC337, you could use a 2N2222 or 2N4401.

    Here's another using just transistors:
    http://www.redcircuits.com/Page84.htm

    For the NPN transistor, you can use a 2N2222/PN2222. For the PNP, use a 2N2907A/PN2907A.
     
    Last edited: Jul 31, 2008
  3. Wendy

    Moderator

    Mar 24, 2008
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    One of the first projects I built multiples of was a simple 2 transistor siren circuit, when I get a chance I'll post the schematic. Odd really, it was on the other side of another schematic I looked up for another post.
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    OK, these are over 30 years old. I've had fun with them.
     
  5. Jasonb61

    Thread Starter Member

    Jul 31, 2008
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    0
    Hey everyone! Thanks for the replies... I can tell I'll be sticking around here for a while lol
     
  6. MIRINGU

    Active Member

    Mar 18, 2007
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    0
    Hi!!!
    IC LM3909(or equivalent NTE 876) produces evenly spaced beeps which create fun or hypnotic effect.BUT, IC LM3909 not easily found in the market.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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    Hmm - the LM3909 was developed to flash LEDs for a very long time from a single 1.5v battery. I've never seen an application for sound using that IC. I suppose it could be used, but starting with an obsolete (and expensive) IC seems to be a rather frustrating way to go.
     
  8. Wendy

    Moderator

    Mar 24, 2008
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    I think I still have a pill bottle kicking around full of them somewhere, though I may have given them away to an astronomy club (to make blinkers for a dark path leading to a big telescope).

    The 555 has some interesting VCO configurations. Wonder if that could be turned into a siren?
     
  9. SgtWookie

    Expert

    Jul 17, 2007
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    Last edited: Aug 2, 2008
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