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  1. Today
  2. Gabs

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    Yes, they were very popular, I am going to email Lynteck and ask if they can shed any light on the design, I doubt they will, but you never know. Might also email Kinetic, but they are probably the same company. Didn't realise Lynteck also had a range of bell boxes https://www.lynteck.co.uk/products/intruder/sounders/#external they all look quite good. Do you know how these sorts of sounder worked? I know many were made
  3. MrHappy

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    I recall kinetic as the brand we bought (pic from google) there where also massive brown ones,
  4. Gabs

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    By lower spec do you mean quieter? I would love to get my hands on one of the Lynteck sirens typically found in the bell boxes of the late 80s, or early 90s. Everyone had them. They are 118 dB, and make a distinct sound, any idea how they work? https://www.lynteck.co.uk/products/intruder/sounders/LY02-009-17.php these, I bet they have some sort of custom IC. I will have a look online, I have seen a few, but I'm not sure if they are meant to drive something as loud as what I am after, although all I may need to do is ramp up the voltage to get the volume to increase
  5. james.wilson

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    Piezo needs high voltage old school mylar cone speakers need less but require more power. I prefered the lower freq as it gives more range but looks worse on spec sheets at 1m
  6. GalaxyGuy

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    Typical driver for a piezo. You'll find many examples on-line. The waveform is probably a warble or the like. I'd suggest getting a copy of Horowitz & Hill 'the art of electronics' it's an excellent reference.
  7. al-yeti

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    I think we need to clone you
  8. Gabs

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    Okay, I have seen the ones with two piezo sounders in them. Do you have any idea how they are driven? Had an old Ventcroft Classic PCB from 1996 connected to my oscilloscope, and it is reading a very high voltage, I am assuming that it is done from the transformer on the board? Interesting waveform, it was moving in a very ordered pattern
  9. james.wilson

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    I rate the multi box sia uses them but only the g3 one
  10. Gabs

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    Haha, catch them stealing the cream doughnuts! I may have a go at vacuum forming my own bell box cover, to fit around a CQR MultiBox. Is the MultiBox any good? Anybody use them? If they are ****, ill just design my own circuitry :-)
  11. MrHappy

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    ↑ they have to fit widescreen cctv to fit the punters on the screen
  12. sixwheeledbeast

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    I was just going to say Greggs have there own facility company do it.
  13. Gabs

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    Was at Greggs this morning, they have their own name on the sounder,
  14. MrHappy

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    ↑@Gabs when you down the shops next time, have a look who's sounder is on the building & who's sticker is on / above the keypad, There's a few retailers which have blank or their own name on the sounder, the current service provider being the lowest bidder...
  15. al-yeti

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    I was just think secom with the flashing beacon underneath lol
  16. Gabs

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    Yes, but it does give a look of individuality, having something that no one else does, look at ADT, there is like a black market for them on eBay, people want them. CQR already have the tooling, so they indeed could probably make and screen print lids, I wonder if they do all of the mouldings in house, or the Far East?
  17. james.wilson

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    No one really cares about a custom bell and the client certainly doesnt
  18. MrHappy

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    I suspect the cost of you producing a custom lid will probably have premium over CQR producing a custom lid. However the concept of the multi box is a good idea but I don't see that many, the largest user & only one I can think that has a custom lid is secom ?
  19. sixwheeledbeast

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    Most companies will put your company logo on for free if you order a batch
  20. Gabs

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    Yes, I understand this, maybe discreet parts are better. As engineers, have your companies ever thought of making your own bell boxes, or even just the covers? My idea would be to design an ultra low-profile cover , get it made, screen printed and then fit it over a CQR MultiBox? In the image shown, it is a normal CQR MultiBox, with my custom injection moulded cover fitted on top
  21. Yesterday
  22. james.wilson

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    As 6 it's the hardest place for a component. But no reason for it not to be microprocessor based, our cars are for instance.
  23. sixwheeledbeast

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    Bellboxes take a beating; either by weather, temperature or burglars. Discrete components are more resilient to this.
  24. Gabs

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    Interesting, I am still trying to understand the circuitry inside a bell box, the idea of one using a microprocessor is interesting, I will try to design my own, easier than a panel. I think the Novagard is the only microprocessor controlled bell box?
  25. Might be a job for Imran, too small for me
  26. MrHappy

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    Cqr intrega was the 1st complete plastic Ewd I recall...
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