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Post by twbm2 on Apr 25, 2020 10:45:51 GMT
I don't think the strategy has ever been about stopping people getting infected. I think it's been about the right people getting it, in the right order, to manage the impact in the NHS. If the young, healthy and inconsiderate insist on infecting each other over the next few weeks, resulting in relatively low numbers getting to the point where they need hospital treatment, that may well work. The downside will be that the vulnerable will definitely have to continue isolation, but that will be the case whenever restrictions are lifted and the cork potentially comes out of the bottle.
On the subject of B&Q and other stores, I guess once the purchases are made, the buyers are then committed at home using what they bought rather than moving about, so there may be some balance there. 20 litres of paint and some timber I had in the shed has kept me busy inside my closed bar since the 21st March.
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Post by duncan on Apr 25, 2020 11:04:08 GMT
Expect to see a rise in visits to A&E as part time diy'ers injury themselves trying to do home improvements.
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Post by Mr Stabby on Apr 25, 2020 11:52:27 GMT
Expect to see a rise in visits to A&E as part time diy'ers injury themselves trying to do home improvements. One of my boys works in an A&E department, he says it's quieter than he's ever known it.
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Post by Boaty on Apr 25, 2020 12:47:34 GMT
I don't think the strategy has ever been about stopping people getting infected. I think it's been about the right people getting it, in the right order, to manage the impact in the NHS. If the young, healthy and inconsiderate insist on infecting each other over the next few weeks, resulting in relatively low numbers getting to the point where they need hospital treatment, that may well work. The downside will be that the vulnerable will definitely have to continue isolation, but that will be the case whenever restrictions are lifted and the cork potentially comes out of the bottle. On the subject of B&Q and other stores, I guess once the purchases are made, the buyers are then committed at home using what they bought rather than moving about, so there may be some balance there. 20 litres of paint and some timber I had in the shed has kept me busy inside my closed bar since the 21st March. You may be right but do you really see the vulnerable accepting a lockdown until a vaccine is available? It may well be possible to have some lesser form of best practice/common sense guidelines in place but to effectively put that group under house arrest is not going to work. There is evidence around our sleepy Suffolk village that it is not working now - even in the house of someone who is meant to be enforcing these rules.
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Post by Andyberg on Apr 25, 2020 14:12:57 GMT
Flights seem to be picking up judging by Manchester T1 airport check-in today!🙂
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Post by duncan on Apr 25, 2020 16:12:54 GMT
Expect to see a rise in visits to A&E as part time diy'ers injury themselves trying to do home improvements. One of my boys works in an A&E department, he says it's quieter than he's ever known it. Partly due to a drop in amateur sports injuries probably
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Post by Deleted on Apr 25, 2020 16:42:14 GMT
No one wants to visit a hospital during a pandemic. Mostt people are just pottering about.
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Post by patty on Apr 25, 2020 17:56:36 GMT
There all here monitoring the law breakers in the Mumbles! Not sure I'd want to be in Horror House at this time I’m sure you are much happier where you are, but Mumbles is where all the numpties will go for their exercise despite its unsuitability. Have you thought if going for a walk along the Marsh road in North Gower? Quite wild, nice (not spectacular) views, marsh ponies and fairly underpopulated. Do I need a car to get there?..not got one yet Met son in laws mum out today..she'd rebelled and escaped lockdown...I woz gonna keep quiet but the next 2 she happened to meet were...daughter and grand daughter ..boy is she in trouble
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Post by Mr Stabby on Apr 25, 2020 19:47:13 GMT
Flights seem to be picking up judging by Manchester T1 airport check-in today!🙂 Yes, I see it's a dead heat in the Zeppelin race.
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Post by kris on Apr 26, 2020 9:17:05 GMT
And whilst I was there, test my prototype smart alternator regulator for LiFePO4 batteries, oh so it’s moved forward then? Do keeps us informed how it’s going.
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Post by naughtyfox on Apr 26, 2020 9:51:54 GMT
Do keeps us informed how it’s going, My Precious!
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Post by Telemachus on Apr 26, 2020 10:21:46 GMT
And whilst I was there, test my prototype smart alternator regulator for LiFePO4 batteries, oh so it’s moved forward then? Do keeps us informed how it’s going. Yes, I posted a lot of technical stuff on CWDF but you don’t go there! In summary I replaced the existing brush set / regulator module, with a cheapo one I got from ebay for a tractor. Snipped the wires to the regulator and modified so one brush was connected to the case, the other to a wire that went to my controller. My controller also connected to the W terminal, which provides an output from one phase (normally used for a tacho) and took the warning light wire off, connected to my board. And then obviously a battery and ground connection for my board. In summary it did work, but with some issues: The software is still in development but I checked the “alternator cooking” function by heating up the temperature probe with a heat gun. I’ve set it up so when it reaches 95C, the maximum field current is reduced to 2A (normally about 4A) which obviously reduces the alternator output. When it drops to 90C the higher field current is authorised. I have done it this way since for a given temperature, an alternator can produce more output at higher rpm because the fan is spinning faster, and the same is true of limiting the field current - reduces the output at lower rpms whilst allowing more output at higher rpms when the fan is going faster. So a tick for that one. It can also receive battery SoC information over CANbus from my Mastervolt system. Tick. Although this isn’t how I propose it will work (it will be automatic) I also included a means of typing in a modified target regulation voltage, in the range 10.5 to 16v via laptop/serial (RS232) connection. This also works, I type in the command, the regulated voltage changes accordingly. Tick. I also noticed that the regulated voltage was held at fairly high outputs, it didn’t drop under load like it does with a conventional analogue regulator, in other words the voltage will be closer to the target voltage at high loads. Tick. These regulator chips are designed to be in constant communication with a microprocessor (eg a car’s ECU) and if communication is lost, they revert to autonomous operation with “fallback” parameters. If I stop my microprocessor from repeatedly sending the target regulation voltage, after 3 seconds it goes to its default regulating voltage of 13.5v, which of course is “lithium safe”. Tick. what was less good was that at higher outputs, there was some instability in the voltage regulations, enough fluctuation to have detectable if slight flicker in the incandescent lights. Looking at the diagnostic data showed big and rapid fluctuations in the field current, and the output voltage fluctuation by up to 0.5v. When I invoked the limited field current it all settled down, so there is no issue with controlling the field current, just the voltage regulation bit. Need to work on that. No tick! These modern alternator regulator chips all have a thing call LRC - Load Response Control. The idea is that at low rpm (around idle), if a big load is switched on one doesn’t want the Alternator to instantly supply that load, because the sudden mechanical load can cause a modern light-flywheel car engine to stall. So at low rpm, when presented with a sudden big load, the alternator output ramps up over a few seconds, part of the load being supplied by the battery in the mean time. This gives the engine control/governor some time to increase fuel supply/raise rpm a bit. The regulator chip I've chosen supports both specifying an rpm below which LRC is operating, and the number of seconds over which the alternator output will ramp up in response to a sudden heavy load. In fact I can have LRC permanently active. When LRC is in operation, my system totally settles down and is fine. So that is one solution, and I think for a boat it wouldn’t matter at all if the alternator was sluggish to respond to a big change in load (for the avoidance of doubt this only affects how quickly the alternator increases output, it will still respond rapidly to a sudden decrease in load). So a half-tick! So I need to do some work on improving the stability in normal regulating mode. I also made a cockup on the PCB design and had to “butcher” it, plus a couple of other minor changes needed including making it fit in an off-the-shelf box. So last night, a new PCB design sent off to Hong Kong. It is already in production, will be finished today but I used cheap shipping so probably 2 weeks to get it back. Total cost about £11 for 5 boards. You’ve gotta love Chinese slave labour!
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Post by Telemachus on Apr 26, 2020 10:32:23 GMT
Do keeps us informed how it’s going, My Precious! You’re just jealous because he wants to hear what I have to say!
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Post by JohnV on Apr 26, 2020 11:03:49 GMT
oh so it’s moved forward then? Do keeps us informed how it’s going. I also made a cockup on the PCB design and had to “butcher” it, plus a couple of other minor changes needed including making it fit in an off-the-shelf box. So last night, a new PCB design sent off to Hong Kong. It is already in production, will be finished today but I used cheap shipping so probably 2 weeks to get it back. Total cost about £11 for 5 boards. You’ve gotta love Chinese slave labour! it requires a lot of skill and a hell of a lot of luck to produce a prototype PCB that can go straight into production (many tee shirts )
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Post by kris on Apr 26, 2020 11:07:15 GMT
Thanks for the update Nick, it all sounds very interesting and industrious on your part. Do please keep me in mind, do you intend to sell kits or something? I’ve not had chance yet to play with the regulators I’ve got. But I’m not even using the lifepo4’s that I have at the moment, because I have an issue with my inverter. Such is life.
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