I once had meandering musings from a few years ago about constructing a Caveman Diorama in an old television set. Sad to relate, things became stalled for a while, the problem being that I had no clue how to set about building the cave itself.
Well, as you may recall, my wife (Gina The Gorgeous) is a blond-haired goddess realtor. A few weeks ago she met a couple who were ambling around looking at houses. It turns out that the husband -- we'll call him Mike (because that's his name) -- creates monster model railroad dioramas as a hobby (check out Mike's Website to see photos of his creations). Mike wants to learn how to use an Arduino to control things like his streetlights, traffic lights, and houselights; I want to learn how to make the cave for my diorama; it's "a marriage made in heaven," as they say.
Mike and I have started to meet up on Saturday mornings in my office. We kick off with a brief hands-on lesson about microcontrollers, and then move on to constructing my diorama. Below we see a rough sketch showing my vision for the future of this little scamp (by which I mean my diorama, not Mike).
Our perspective is that we're looking through the TV screen into the back of the cave. The entrance to the cave is located toward the back of the TV set. Through this entrance we see a depiction of mountains and trees and sky, all of which will be displayed on a flat screen computer monitor, thereby allowing me to have special effects like lightning and the moon crossing the sky and meteor showers and suchlike.
There will be a group of people sitting around a fire in the middle of the cave. Most of them will be cavemen, but yours truly will also be there in my Hawaiian shirt (an H.G. Wells-esque time machine in the corner of the cave will explain my presence).
One problem I faced was how to create the figures themselves. I've decided to work at 1:32 scale, so a 6' man will be 2.25" tall. Then, yesterday, I discovered the creations of Leonardo Torricini on his Phersu Miniatures website. Leonardo's work spans time and space, from Etruscan warriors to characters from Monty Python's Holy Grail. Of particular interest to me are his Prehistoric Cavemen and Animals figures and dioramas.
Leonardo typically works at 1:72 scale, but on occasion he's created models at 1:32 scale, such as these Etruscan characters. We are currently bouncing emails back and forth with regard to Leonardo crafting the figures for my diorama.
But that's not what I wanted to talk to you about... The reason I'm waffling on about it here is that I also plan on including sound effects, such as the wind blowing on a frisky day, rolls of thunder on a stormy night, and so forth.
In particular, if you listen carefully, you'll hear a background conversation taking place between the characters sitting around the campfire. Most of this will be in caveman-ese, of course, but every now and then you'll hear my dulcet tones regaling the assembled throng with some astute and pertinent tidbit of trivia or nugget of knowledge like: "Corr Blimey, it's #$%%^* cold in here!"
My comments will be appropriate to the time of day and the season. During the summer, for example, I might make mention of the advantages of air conditioning and the joys of ice cream; throughout the winter months, I may note the benefits associated with thermal underwear; and during a storm, I could explain the well-known fact that lightning and thunder are caused by Thor the god of thunder.
When nothing particularly interesting is happening, I might comment on random and diverse topics, such as how the taste of mammoth burgers would be much improved by a dash of Heinz Tomato Ketchup and a squirt of French's Yellow Mustard, or the inadvisability of transporting ferrets in one's loincloth (as I'm sure we've all discovered to our cost).
So, this is the point where I hand things over to you. Are there any visual effects and/or sound effects that you think I should add to my diorama? And can you think of anything I could be / should be dropping into the conversation (please make note of the time, season, and context)?
用户1406868 2015-10-23 13:33
用户1277994 2012-12-27 15:12
用户1061540 2012-12-21 01:17
问题出在没有考虑电路的工作范围,对它期望太高了。设计不仅没考虑余量,还打了没擦到边的擦边球。
用数据例来说话吧。
假设负载用2欧,恒流想是8A,则R8上的压降是0.44V。晶体管的BE电压大约是1.3V,于是Vb约1.74V。为了使晶体管工作在放大区,Vc至少要比Vb大一点,假如大2V。这样一来,Vc就到了3.7V。 于是,落在R6上的电压只有18-3.7=14.3V。这个电压只可能使2欧电阻里的电流等于7.15A,而到不了8A。R6减小一点后,电流就到了8A。
另,18V电源在输出电流大的时候,输出电压也可能到不了18V,那电源估计得有150W才行。
要想做恒流源,需要减小恒流范围,例如到6A,或减小负载阻值,例如最大负载电阻1.5欧,或加大电源,例如用24V,200W的电源。
用户1061540 2012-12-21 01:16
问题出在没有考虑电路的工作范围,对它期望太高了。设计不仅没考虑余量,还打了没擦到边的擦边球。
用户1608584 2012-12-19 10:38
sky8308_885409302 2012-12-18 17:51
用户1206355 2012-12-15 10:56
william.tell_522917087 2012-12-15 10:53
用户1608584 2012-12-15 09:28
handong123123_906892115 2012-12-14 09:23