Jan. 8th, 2019

kengr: (Default)
Hopefully one of you is an electronics wizard.

I need a circuit design. *hopefully* it's a fairly simple job. Once I've got the design, I can build it myself.

Ok, hopefully you've seen the ever-popular-with-geeks binary clocks. They have rows of LEDs the tell the time in BCD or even "true binary".

What I want to build is a *trinary* clock. It'd use the Red/green LEDs. The ones that are red if the current flows one way, and green if it flows the other way (and a sort of orange if the flow is changing directions really fast).

The trinary states would (obviously) be:
0 = off
1 = red
2 = green

And the display would be "trinary coded decimal" (Perhaps with true trinary as an option.)

So the values would be (turned sideways) with X for off,. R for red, and G for green

0 = XXX
1 = XXR
2 = XXG
3 = XRX
4 = XRR
5 = XRG
6 = XGX
7 = XGR
8 = XGG
9 = RXX

So the display for the TCD version would look like this: (underlines are just to get things to line up right)

_X___X___X
_X__XX__XX
XX__XX__XX

For the true trinary, we need the numbers up to 59

10 = XRXR
11 = XRXG
12 = XRRX
13 = XRRR
14 = XRRG
15 = XRGX
16 = XRGR
17 = XRGG
18 = XGXX
19 = XGXR
20 = XGXG
21 = XGRX
22 = XGRR
23 = XGRG
24 = XGGX
25 = XGGR
26 = XGGG
27 = RXXX
28 = RXXR
29 = RXXG
30 = RXRX
31 = RXRR
32 = RXRG
33 = RXGX
34 = RXGR
35 = RXGG
36 = RRXX
37 = RRXR
38 = RRXG
39 = RRRX
40 = RRRR
41 = RRRG
42 = RRGX
43 = RRGR
44 = RRGG
45 = RGXX
46 = RGXR
47 = RGXG
48 = RGRX
49 = RGRR
50 = RGRG
51 = RGGX
52 = RGGR
53 = RGGG
54 = GXXX
55 = GXXR
56 = GXXG
57 = GXRX
58 = GXRR
59 = GXRG
60 = GXGX
61 = GXGR
62 = GXGG
63 = GRXX
64 = GRXR
65 = GRXG
66 = GRRX
67 = GRRR
68 = GRRG
69 = GRGX
70 = GRGR
71 = GRGG
72 = GGXX
73 = GGXR
74 = GGXG
75 = GGRX
76 = GGRR
77 = GGRG
78 = GGGX
79 = GGGR
80 = GGGG

So the true trinary display would look like this:
_XXX
XXXX
XXXX
kengr: (Default)
The instructions for extracting saltpeter in Pryotechnica (a medieval manuscript) describe how to extract saltpeter.

You mix pee, manure and wood ashes in a barrel. Heat it well over a fire and stir. After it's been cooked long enough, you transfer it into another barrel that has a perforated bottom. You pour hot water into the top and collect the liquid that comes out the bottom. That gets boiled to to produce the crude saltpeter cyrstals.

But that's not the sucky part of the job. It's this last bit. You are to pour water into the perforated barrel until the runoff no longer tastes bitter *to your apprentice*. Yes, the manuscript specifies that the apprentice is the one who gets to taste the runoff...

Other not fun jobs back then. Harem guard. . And male soprano singer in a choir (both have the same minor surgical procedure required)

On yeah, it wasn't until a little over 100 years ago that the Church outlawed the making of castrati,

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