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Airlite 71 Aviation Headset

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Apple Macintosh SE FDHD

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Baygen Freeplay Lantern

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Benkson 92 Baby Sitter Alarm

Betacom BF1 Pianotel Phone

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Commodore 64 Home PC

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Coomber 2241-7 CD Cassette

Contamination Meter No.1

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Shell Headset 5965-99-100

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Horstmann Pluslite Task Lamp

Ianero Polaris Spotlight

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International HP-1000 Radio

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ITT KB Super AM/FM Radio

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Koss ESP-6 Headphones

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Kyoto S600 8-Track Player

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Macarthys Surgical AM Radio

Magnetic Core Memory 4kb

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Marlboro Giant  AM Radio

Mattel Intellivision

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McArthur Microscope OU

Mehanotehnika Intercom

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Micronta 22-195A Multimeter

Micronta 3001 Metal Detector

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Microphax Case II Fiche

Midland 12-204 Tape Rccorder

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Mini Instruments 5.40 Geiger

Minifon Attaché Tape Recorder

Minolta 10P 16mm Camera


Widget Of The Week

Linwood Simple Siren Car Alarm, 1984

Judging by recent media reports car theft has never been easier, thanks to many modern (and usually expensive) cars being fitted with super-secure ‘keyless’ ignition systems… A cynic might mutter something about Murphy’s Law and chickens roosting, though to be fair nicking cars, or ‘Twocking’, (taking without consent – I know all the modern words…), has been with us, probably since before the first Model Ts rolled off Henry Ford’s production line. But for some reason, until comparatively recently, car makers have given it a relatively low priority. I clearly remember the well-worn ignition key for my first car, a scary late 60s Austin 1100, could open and start a surprisingly wide range of vehicles, made by the likes of Ford, British Leyland (as was) and Vauxhall. My guess is the only thing that prevented more widespread theft was that most British cars from that era were unreliable rust-buckets hardly worth the effort of pinching. As recently as the 1980s if you wanted to ensure your car’s security you’d have to have an alarm fitted -- it tended to be an optional extra on new cars – or immobilise it with a Heath Robinson device that fitted over the steering wheel. The other option was to fit an alarm yourself, and the Linwood Simple Siren Car Alarm featured here was one of dozens of DIY systems available at the time.


Back then car self-fit alarms were fairly simple affairs and most, including this one, were triggered by a small drop in the car’s battery voltage. This could be caused by the courtesy light coming on,when a door is opened, or switching on the headlights or sidelights. Other types of intruder sensors were also available, like ‘tremblers’, which responded to movement, ultrasonic motion detectors and concealed pressure switches under the carpets and inside the driver’s seat. A keyswitch located on the outside of the car or, in this case, the driver turning on the ignition disables the alarm. A variable entry delay stops the alarm going off straight away. Typically the alarm box or siren module would be mounted under the bonnet, so an additional switch might be fitted to trigger the alarm if it was opened. Old-school alarms like this one tended to be really loud, and would keep going until the owner turned them off, or the battery ran down. There was a time when they went off all the time, usually around 2am, and the ones that used overly sensitive tremblers could be set off by a light breeze, passing lorries, drunks and scallywags. It has got better, though and nowadays car alarms are supposed to cut-off automatically 20 minutes, in theory at least.


The Linwood Simple Siren, as the name implies, was some distance from the cutting edge of alarm technology, but that also meant that just about anyone handy with a screwdriver could fit it, and at around £20, it was a fraction of the price of a professionally installed system. There seems to be two schools of though about the visibility of car alarms; most are hidden away inside discrete black boxes, indistinguishable from the rest of a car’s electrical gubbins. This one takes the opposite approach, and there would be absolutely no doubt what it was for. This might be a good thing on a car accessory dealer’s shelves, but fairly pointless when it’s under the bonnet, and quite possibly a disadvantage if a car thief is hoping to find the source of the noise and shut it up (a bonnet switch seems to be an optional extra on this model).


The most noticeable feature is the built in siren/sounder, clearly visible through the thin plastic grille. This could be a design flaw as it looks like it could be swiftly silenced by a quick jab with a screwdriver. Incidentally, the sounder is actually a small loudspeaker but with a rigid plastic cone, instead of the more usual paper material. It’s effectively a giant ‘tweeter’, designed to operate most efficiently at higher frequencies. The siren sound is generated by a 741 op-amp chip, configured as an oscillator, and the alarm’s voltage sensing and logic circuitry is based around a pair of 4001 quad NOR gate CMOS chips. These and the handful of ancillary components live on a PCB mounted next to the sounder. Connections to the car’s electrical system consist of 12-volt battery positive and negative ground cables, a connection to the ignition switch and a pair of ‘sensor’ wires, to connect to the driver’s door courtesy light switch. There’s also provision for another external sensor (probably the bonnet switch).  Apart from the questionable housing it’s all quite well made and there’s even a waterproof ‘conformal’ coating on the printed circuit board, to protect it from moisture.


I found it in a big box of bits at a car boot sale; I was actually hunting for a 12-volt mains adaptor at the time, which I found, tangled up with the Linwood alarm’s cables. Since it looked like they would take a while to separate I asked how much for both? Fifty pence sounded like a reasonable price and the deal was done. The mains adaptor tuned out to be a dud, so it went into the bin and the alarm went into the might-be-useful-for-bits-one-day box. This was a couple of years ago, and it came to light recently when I was looking for a small speaker. I vaguely remember having this one and it was only when I pulled it apart that I realised it was totally useless for my purpose. It was about to go back in the box when I noticed the date on the PCB (‘pat pending 1984’) and that it was in such good condition. This bought back memories of a review of a kit car alarm and couple of articles that I wrote on car security for a motoring magazine that I was involved with in the early 80s.


It clearly had been installed at some time and fitted with industrial strength metal brackets but it was far too clean to have been in the engine compartment and I suspect it was mounted in the boot. Thanks to the well-labelled PCB I was about to figure out what the five wires emerging from the case were for. It powered up and made a suitably deafening noise, when hooked up to my bench power supply. I was also able to test the voltage sensing function, which operated very effectively when the supply dropped from 13.5 to 13.4 volts.


What Happened To It?

Linwood in Birmingham was the home of Linwood Electronic and for a short while, from the mid 70s to the mid 90s, or thereabouts, they produced a range of car alarms and accessories, like battery chargers, wheel clamps and so on. According to records at companies house they were trading for over 20 years but when the company was formed and dissolved wasn’t shown. They seem to have disappeared without trace, or at least left any sort of footprint on the web, aside from an occasional product turning up on ebay.


Whilst most cars are now sold with some sort of factory-fitted security system as standard, the emphasis has shifted from noisy alarms to ways of preventing would-be thieves gaining access in the first place, and immobilising the vehicle if it is compromised. This has involved all sorts of digital trickery, from basic stuff like remote control and microchipped key fobs to the currently trendy (but seemingly hackable) keyless systems, fingerprint recognition, remote monitoring, GPS tracking and probably coming soon to a car near you (or maybe here already…) voice recognition, retinal scanning and microchip implants for the owner’s body. It’s ironic that the current spate of thefts of cars with keyless systems has prompted experts to advise owners of vulnerable cars to buy a steering wheel lock…      


I am not aware of car alarms having any sort of following in the vintage tech collector community, and why would they? Nevertheless it is a mildly interesting subject but I’ll not waste time putting a value on this and other alarms from the same era. The 50 pence I paid for this one (and that faulty mains adaptor) was probably too much, and it certainly has no practical use. I won’t even suggest that you seek out bargains as a potential investment  -- that’s not going to happen. It is possible that alarms from a much earlier time – and I’m only guessing that they exist – might be of interest to vintage and veteran car enthusiasts. But dull as they are I would hate to think that the brief history of the aftermarket car alarm, and the Linwood Simple Siren goes completely unrecorded.

First seen:              1984

Original Price:       £20?

Value Today:         50 pence (0518)

Features:               voltage sensing trigger, internal siren, variable entry delay, auxillary trigger/sensor

Power req.                       12 volts DC (car battery)

Dimensions:                     162 x 113 x 63mm

Weight:                            450g

Made (assembled) in:       England

Hen's Teeth (10 rarest)     7



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