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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!2.eu.feeder.erje.net!feeder.erje.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Carlos E.R." Newsgroups: sci.electronics.design Subject: Re: Exploding pagers Date: Fri, 20 Sep 2024 12:42:19 +0200 Lines: 38 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net kArlqpj/3xxkzDLUfshSRQ9J8KeNZk4YkbFWkZDPdBVOsEtFf3 X-Orig-Path: Telcontar.valinor!not-for-mail Cancel-Lock: sha1:B7e/9NPkVZbebcUXgcC7xUem2IY= sha256:sTXhXo9Pr6yjKhKFB+g2W5zxZtO2G1x/g4yp0rS6aTs= User-Agent: Mozilla Thunderbird Content-Language: es-ES, en-CA In-Reply-To: Bytes: 2556 On 2024-09-19 17:59, Crash Gordon wrote: > On 9/17/2024 1:18 PM, Crash Gordon wrote: >> Posting is on-topic for s.e.d because these things had to be *designed*. > > I expected there'd be politics, but I was hoping for more discussion of > *how* this was accomplished.  So I'll answer my own question. > > Apparently "somebody" built batteries containing PETN which would > detonate when the battery exceeded some temperature.  Then installed > these batteries into ordinary pagers; the only clue that something was > wrong would be that battery life would likely not be what the spec sheet > said it should be. > > Then by repeatedly triggering the pagers, caused the batteries to heat > up resulting in detonation of the PETN.  I wouldn't be surprised to find > a piece of nichrome inside the battery; it would heat a little when the > pager activated and then cool off, but repeated activation would push it > over the threshold.  Maybe a schottky involved somehow, to prevent > heating when the battery is being charged. But it appears that they exploded simultaneously or nearly so. Hard to achieve that synchronicity by heating. I rather think they sent some type of code, maybe a string. Methinks that now the factories are a legitimate target for the "receiving side", unless they can convincingly prove that they are totally innocent. I wonder if the entire batch was deployed, whether there are intact pagers in storage that they can investigate. > The radios on the next day would have been fitted with similar batteries > but I'm not sure how they would have triggered the heating. > -- Cheers, Carlos.