Gabs
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Posts posted by Gabs
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Yeah, must have cost them a lot of money. That was my worry when trying to design an SAB, how the battery charging circuit could potentially cause a fire
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58 minutes ago, MrHappy said:
they wrote to every household in the UK to inform them of a potential fire risk in their external sounder,
which resulted every alarm co. being asked by loads of worried customers if the completely different box was going to burn them to death....
That just from water getting into them? Thats no good, It is loud though, 120dB
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9 hours ago, norman said:
Yeah they also did an early variant of this in the 90's sponsored by Keith Flint...
Kieth Flint? Okay haha, I emailed them, but they didn't have anything of interest to give me, just a PDF, showcasing all of their sounders. Is that sounder pictured any good?
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9 minutes ago, MrHappy said:
I recall kinetic as the brand we bought (pic from google)
there where also massive brown ones,
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
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11 minutes ago, james.wilson said:
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
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.
16 minutes ago, GalaxyGuy said: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.
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
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34 minutes ago, james.wilson said:
I rate the multi box sia uses them but only the g3 one
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
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50 minutes ago, MrHappy said:
↑ they have to fit widescreen cctv to fit the punters on the screen
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 :-)
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17 minutes ago, MrHappy said:
↑@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...
Was at Greggs this morning, they have their own name on the sounder,
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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?
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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
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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?
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So they were innovators. Was it CQR to make the first 'Modern' bell box? where everything is all in one neat little box? Or was it someone different?
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So they were very big then, I wonder why/when it declined. I guess it was, although they could have tried to make it more 'sleek' Were they the first microprocessor alarm panels?
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Lots then, do they still make the 9800? I have only seen this type recently, the older 9800 keypads do look awful, though. The more modern ones look better
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Interesting, I wonder how big they were, if he was only one of the directors. Scantronic now have been bought out?
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Was thinking about that, I may make a Mk. 3 version with an Arduino Nano micro-controller, which has a delay on it, the Viper does to stop false alarms from insects. Might give using IR LEDs a go too
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@MrHappy @Nova-Security Cheers for the help with these, I have finished the Mk. 2 Anti-Foam module, looks very similar to the V-Foam
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7 minutes ago, Nova-Security said:
Just for H
Having a tidy up of the garage and cant believe i found one.
Gabs
You need a diode across the relay coil of that one you made to protect the transistor and possible a resistor to limit the current the relay pulls, well done on the MK1 cant wait to see your next projects.
Send me your address and will send this V foam to you
Wow, thanks. I am glad that you like my projects. I thought about a diode, and I will add one in the Mark 2 version. And thanks again, I will PM you my details.
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2 hours ago, MrHappy said:
Sab1045 bell module I fitted these in the past but can't recall who made them, red/ blk goes to a comfort led
That one looks good, do you still have them? or it? I could try and copy the board design out, im in need of a schematic for one. Excuse my lack of knowledge, but what's a digital? Looks old and interesting.
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11 minutes ago, MrHappy said:
This was removed the other week from a adaptable box in loft, oldest scantronic Digi i recall seeing
So this was a bell module? In the loft? Looks to be in very good condition, do you take down many standard bell modules? like SAB modules?
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Interesting, I understand, its easier and cheaper to buy a fully made up bell box now. Do you take many of these down? Or have any old stock of these? Would be interesting to see them. I like the fact that the internals of a bell box are on 24/7, 365 days a year, constantly for 20 years or more, never get a break. some very robust electronics.
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Thanks, I have one of the "Modern Alarms" bell boxes with these in, will get a pic. Well, mine didn't false alarm at all, during light tests I did, I'm impressed. I know, looked on Google for some pics. Don't know why they couldn't be as simple as the one that I made. Those Hexagon bell boxes were such a good design, shame they changed it. The idea of a foam detector is flawed anyway, by the time it has been squirted? in it would be too late.
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Does anyone have any experience with these sorts of detectors that you'd get in older bell boxes? Or know how they worked?
I have just made one, using the most simple bits possible, two resistors, an LDR and a 2n2222 transistor. Did they work like that
a beam of light getting interrupted, or was it more advanced? Been testing mine, and I couldn't get it to false alarm at all.
Thanks,
Gabs
Start An Alarm Manufacturer
in Members Lounge (Public)
Posted
I know, so there is little risk of Ni-Cd causing a fire? That is what I was going to design my SAB with?