Gabs

Would have thought it was because they are more distinctive like the Piezo, I could have a go at designing something that looks modern and slim yet has a bell, like a EuroBell, just been thinking of manufacturing processes that could be used to make such a bell box..

Seen a few of them. Don't know why they were made so big, since it is all slim electronics. Do you still think there is any market for bell boxes that use real bells?

Looks interesting, I think I have seen them before Look like this? Did it still work when you took it down?

ADE Sold to Novar and in turn to Honeywell? Funny how Honeywell own them, yet the newest Accentas still say ADE on them. I would be interested to get my oscilloscope on that Avanti and compare the serial data to an Accentas. I bet they would be the same or similar. So, GSPK make the boards, I wonder if they are also involved in the circuit design? Or thaw as done by whoever previously worked at ADE and left when they were sold?

Avanti? Never seen or used one, why? The IC is Philips, not seen that before. And the T A D B Bell connections make me think of ADE

Yeah, I have a 6v one, stolen from the PCB of my dead hexagon Modern Alarms bell box, was happy for me to put in 12v all day, drew no current, didn't get hot and it held a charge fine, probably how most SABs do the charging, constantly cutting power into the battery, through the Hold-Off Voltage

I know, so there is little risk of Ni-Cd causing a fire? That is what I was going to design my SAB with?

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

That just from water getting into them? Thats no good, It is loud though, 120dB

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?

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

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

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

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 :-)

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

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?

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

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?

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?

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?

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

Interesting, I wonder how big they were, if he was only one of the directors. Scantronic now have been bought out?

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

@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