Another visit from the illustrious Miss Steaks. She always seems to show up now and then
I know her well!
This is the life of an engineer.
Yes, that was a monumental goof, but fortunately it was precisely ground to the wrong profile, so they could add a correction lens to cancel the error.
Yes, there was a very good program, once again on PBS America, about how they managed to correct the error. The missus was out so I was able to watch the whole program.
Hello again,
Dont get me started on the "space program" or should i say the "lack of space program"
Who can forget the mission to mars where Lockheed used English units and NASA used metric units, even though NASA had sent out a paper years earlier stating that metric units would be the standard from then on. The little spacecraft is now either crashed on the surface of Mars or is orbiting the Sun, and the money for that project can now be found down the drain. The REAL funny part is that during tests the error was not detected long before the launch date. So that's TWO mistakes in one which cost a lot of money.
I think there was another Mars crash recently too wasnt there from the European space program's attempt to land on Mars again. That's two swings and two misses for them now too.
I dont even want to talk about the Shuttle program which was a complete bungle on the part of it's management.
In fact, the only good thing i can say about the space program is that it may someday help us deflect an incoming asteroid and if they can do that they will prove their worthiness above and beyond any counter reasoning, but if they fail, they will have proved that man can not defend the planet properly when it's really needed. Going by current knowledge of this phenomenon, they will in fact be needed to perform this kind of defence sometime in the future so i HOPE they are working on this and can get it RIGHT the first time as they probably wont get a second chance.
Yes this kind of fundamental and unforced error is all too common.
I expect you are referring to the space shuttle seals, which according to my knowledge, they were warned about but did nothing about it.
I watch a series on UK TV about plane crashes and some of the reasons for the crashes are astonishing: the pilot tried to take off with his foot on the break/ without deploying flaps/ when the aircraft was covered in ice/ without permission to take off/ with insufficient fuel...
But what gets me really going are the procedural gaffs- apparently they do not weigh the aircraft they just estimate the weight and weight distribution. How difficult could it be to have built-in weight sensors with all the technology on-board an aircraft.
I will stop now.
spec
Well I tried to sort this out on my own but it's not working out. I wanted to use this on a small 1.2Ah 6v lead acid battery so I made some adjustments. The charge voltage and current adjust down to my needs just fine, but I'm unable to get the red led to come on except for a very slight glow. I've tried adjusting the bias resistor but it isn't making enough of a difference, I also tried splitting R2 into an 82R and a 39R and placing the anode of LED1 between (effectively keeping the total for R2 what it was). Help! Please!
No, sorry, I missed the high efficiency led.
I did try configuring the circuit for a normal efficiency LED but it got a bit awkward
Hmm that is odd because the maximum current, with the current control potentiometer adjusted to minimum resistance should be around 49mA.
Nice Ron- one transistor less.
