Archive for the ‘Security and Safety’ Category:

2020-06-12 Superspreaders And CoVID19

From Ars Technica article https://arstechnica.com/science/2020/06/just-10-20-of-covid-19-cases-behind-80-of-transmission-studies-suggest/ Quote “Cowling noted that Japan—which has been relatively successful at managing the pandemic—has employed an anti-superspreading policy called the three Cs: Avoid (1) Closed spaces with poor ventilation, (2) Crowded places, and (3) Close-contact settings, such as close-range conversations. The risk for superspreading is highest in situations with all three

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2020-06-11 Optocouplers Don’t Always Protect

From FB comment Monty Ross It’s true that optocouplers are used for isolation. But I have seen whole sections of PC boards with a hole burned where the optocouplers used to be. It is incredible how much damage the power lines do to the PC boards due to high voltage spikes in the power. Transformers

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2020-06-05 UV-C Germicidal Lamps Real Or Fake Test

Clive tests three UV-C germicidal lamps to see if they are really putting out UV-C sterilizing light in this 3 minute video. He uses the green banana test. It’s obvious how the cheap LED lights don’t put out any germicidal UV-C. The UV-C wavelengths are blocked by regular window glass or the clear epoxy used

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2020-04-16

From (my comments at the end) EGEB: Scientists and the NRDC score a big court win against the EPA The Electrek Green Energy Brief (EGEB): A daily technical, financial, and political review/analysis of important green energy news. Quote Science wins Yesterday, a federal judge in New York invalidated an October 2017 Environmental Protection Agency (EPA)

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2020-03-09 Chernobyl & Fukushima Cancer Deaths Estimates

This coming week marks the 9th year since the Fukushima Dai Ichi nuclear disasters. I keep hearing that all the deaths due to nuclear power plants add up to just a 2 digit number. But it’s not that simple – the nuclear apologists try to understate the deaths and damage done. I don’t think that

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2020-02-08 60 LED Solar Lights Stopped Working – Dead Diode!

From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on the

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2017-09-01 Automated Gallows – Arduino 

Suggestion for project on FB group Arduino Projects – Sept 17 Automated Gallows! A motorized winch adjusts noose. Asks for three officials to each press confirmation button. Has an emergency abort button. Counts down 5, 4, 3, 2, 1… Pulls the trapdoor latch! Monitors heartrate until no sign for 5 minutes Lights up sign “Execution

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2017-06-04 Making A NC Switch Look NO

I’ve been thinking about this for awhile.  Let’s say I have a switch, for example a thermal switch that only has contacts that are NC (normally closed) until a certain temperature is reached.  At that point, it changes to open, interrupting the circuit.  But the input to my controller senses NO (normally open) switch contacts

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2016-12-10 Snowden – Courage And Fear

Someone I know posted this to Facebook: “Courage is not living without fear. Courage is being scared to death and doing the right thing anyway.” What does this have to do with Snowden?  Well, think about it.  Did he weigh the consequences of his actions?  Did he think about what would happen if he went

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2016-07-26 Surge Protectors

I have read about, discussed and experienced how surge protectors work and don’t work, and have written about it before, but Ill try again to explain. Ripoff The most egregious thing surge protectors do is take your money. One of the highest, if not the highest profit margin devices in your home is a surge

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