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  1. S

    Need help with this police horn circuit

    I'll get the 1n4001 diode later today with 1A forward voltage of 0.93V (930mV). One of the resistors on that sourced video looks much larger than on the board we're making here. I'll probably pick up some more stuff to play with... Maybe this guy modified which components he used to get the Dat...
  2. S

    Need help with this police horn circuit

    Right ok, I've not got much to play with but I tried a 2.7k R in lieu of the 11k R and it made it a higher pitch, actually reminded me of Death in "Gauntlet", just to allude my age :rolleyes:. So that's the wrong way, but this is a fun game anyhow. :)
  3. S

    Need help with this police horn circuit

    OK, great news: I got something!!! :D Quite right about the diode. Am using a 1mF (or 1uF mi) capacitor, and 2700Ohm resistor from pin 2 of 555-1, no way Justin could have read that. Also, not bypassing 2700 resistor either, it doesn't make sense that. Here's the vid: ok it's not the DAT VOICE...
  4. S

    Need help with this police horn circuit

    Ok, so I had a little play with the most excellent falstad circuit simulator software and came up with this literal transfer of the schematic (or so I believe): Oh, skip to 3:25 if you care to watch (the skip function hasn't worked)... By the looks of it, in theory, something should be...
  5. S

    Need help with this police horn circuit

    Well, the drawing of the schem in that vid appears to be copied direct from this diagram, below, anyway, (I found larger version) which uses a 1mF (microFarad) capacitor. Alas, already have I tried that :(
  6. S

    Need help with this police horn circuit

    Oh, sorry. That's so funny though. I'M jimmicreesti also. :D. I downloaded and uploaded the video myself in case it went astray (as it sometimes happens on Youtube). Originally, I found it here: http://www.mynet.com/video/motorluaraclar/polis-arabasi-korna-siren-devresi-1470612/ and then...
  7. S

    Need help with this police horn circuit

    Good point! Doh! No, polyester film caps aren't, hmm neither are ceramic disc, (checking) neither are metalised polyester film, tantalum bead ARE (mostly), same as almost all electrolytic . Maplin didn't have any other 1nF capacitors anyway, I'll source one and get back here. Thanks Justin. Ok...
  8. S

    Need help with this police horn circuit

    Thanks Justin! Ok I tried it but not working so far. Though I couldn't get a radial capacitor 1nF only a polyester box version (??).
  9. S

    Need help with this police horn circuit

    Thanks George! I tried Eagle which I'm sure is brilliant but I'm not of the comprehension to get my head around it for now. Then I tried an online simulator which had a 10 minute expiry, seemed good but I wasn't enticed to play further. This falstad one seems great! I've just had a go before bed...
  10. S

    Need help with this police horn circuit

    Thank you soo so so much, George! :) Oh wow, so excited!!!
  11. S

    Need help with this police horn circuit

    Here's my vero/stripboard/breadboard attempts: (top veroboard has a 1KR borrowed for the second vero attempt)
  12. S

    Need help with this police horn circuit

    I tried 3 times on veroboards to create it before getting a breadboard and still can't make it work with the breadboard. Here's the schematic, followed by a YouTube vid of it working: Please can someone show me how to put this to a breadboard. Seriously not sure what I'm doing wrong. Thank...