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  1. S

    Help needed with 555 Horn circuit Please

    Thanks, I'll have a closer read in a minute what you've said. It's not however a siren I'm trying to make, it's more a DAT VOICE sound, like crows. I think I understand one thing you're saying, as I noticed with the farad sim I could get the same effect by mirroring the resistor setup on 555-2...
  2. S

    Help needed with 555 Horn circuit Please

    Just to say, the bypass around the 2.7k R is weird and makes no sense so I think we're basically ignoring it.
  3. S

    Help needed with 555 Horn circuit Please

    Hi John, thanks for replying. Let me get back to you with a farad video. That diagram was what I had to work with but I see I only put the medium size copy from imageshack. So I'll put the larger version below here now. One thing I've missed is the diode, it's meant to be a 1N4001 and I only...
  4. S

    Help needed with 555 Horn circuit Please

    Ok, got something working. It's not the horn sound yet but it IS sound. The first video clip is my breadboard. The second one below that is the sound I'm after
  5. S

    Help needed with 555 Horn circuit Please

    Thanks, yeah I know, I thought that was odd so when building it I left the bypass until it didn't work then added the bypass after. When I did the breadboard I bought a switch aswell to test for a difference (you might see the switch on the breadboard pic, haha). Anyway, it didn't make a...
  6. S

    Help needed with 555 Horn circuit Please

    Hi, I found a video on Youtube that shows the schematic and demo of a police horn (not siren). I'm a noob but I thought I could crack it with a little research and good enough solder skills. I'm not smart enough to verify the circuit however. Well, I tried once to make it really small on a...
  7. S

    Hello, I want to like this!

    Hello, :) I'm pretty new to all this. What I mean is I vaguely remember doing this stuff at school but not to any great degree beyond resistor calculations and Ohm's law. Now I'm 36 and once again, another of those studies from school has caught my arm again, obviously you can't do...
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