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Old 02-01-2013, 03:56 PM
  #15821  
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Originally Posted by Joe Perez View Post
It does not contain a microprocessor or a crystal- it's all discrete logic which takes the incoming 60Hz AC power signal, rectifies it down into a clock, and then drives a pair of 4 bit counters (74LS193) configured as a single 8 bit counter. Each counter pair goes into a dual 4 input NAND gate (74LS20) which determines when the appropriate count has been reached (60 in the case of minutes and seconds, and either 12 or 24 for the hours) which then clears the counters and passes one clock pulse down to the next section.
Which is pretty much how $10 alarm clocks worked for decades, except they used BCD counters and 7 segment displays. It also explains why the snooze bar always gave something like 9.1 minutes instead an even 10; at 60 Hz a 15 bit counter will roll over in 9.1 minutes.


I keep wanting to build a liquid clock, driven by the steady dripping of water from a single orifice into a series of weighted containers which tip over and fill one another. I've got a basic plan for it in my head, but haven't quite figured out some logistical details.
That would be cool! I can imagine an ancient Japanese or Chinese version.

obligatory photo:
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Old 02-01-2013, 04:03 PM
  #15822  
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Originally Posted by rleete View Post
So, enlighten us. What time is that displaying?
I've highlighted it so that you can read it yourself:



For each row, the values add together. So in the seconds row, 32+16+1=49, in the minutes row 16+8+2+1=27, and in the hours row 8+1=9. It's 9:27:49.

How much would it cost to build one (minus case)?
You know, I never really costed it out. Lemme do a quick DigiKey BOM.

(typing).

If you build it exactly the way I did, the front-panel semiconductors come to $20.35. The perfboard was $4.49 at RadioShack. The resistors will be about $3.50, switches would be about $10 for four, and there's probably another $15 worth of power supply in the back. Figure about $55 altogether, assuming you build the case out of scrap wood you have lying around. Less than a commercial kit, and it reads in "real" binary, which most of the kits actually do not.

Obviously some of the parts on the front panel are there purely for aesthetic reasons. You will never have seconds or minutes > 59, nor hours > 23, so a lot of those LEDs / resistors / transistors are purely cosmetic. They are, in fact, hooked up, but they'll never be used (well, I did light them all up during testing before the NAND gates were configured, while I was validating the operation of the counters. They can, in fact, count all the way to 255 in each row.) Cost on those parts is trivial, however.





edit: what do the switches do? For setting the time?
Yeah. The upper-right is a run/stop switch, so I can pause the time when I set it. Upper-left is a 12/24 hour selector. The two switches on the bottom are fast-set and slow-set. Slow-set bypass the 60ths of a second divider (so that the seconds row advances at a rate of 60 seconds per second), and fast-set bypasses both that and the seconds divider (so that minutes advances at 60 minutes per second).

So the setting procedure is:

1: Flip the run/stop switch to "stop."
2: Activate the "fast set" switch until you're within an hour or so of the actual time.
3: Activate the "slow set" switch until you just barely over-shoot the actual time.
4: When the actual time catches up to the displayed time, flip the run/stop switch back to "run."
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Last edited by Joe Perez; 02-01-2013 at 05:29 PM.
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Old 02-01-2013, 04:08 PM
  #15823  
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I can read this faster

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Old 02-01-2013, 04:08 PM
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Originally Posted by DaveC View Post
obligatory photo:
I Beartato.
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Old 02-01-2013, 04:43 PM
  #15825  
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Originally Posted by Joe Perez View Post
I Beartato.
NEWS UPDATE:

Joe Perez Wins Photo Thread!


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Old 02-01-2013, 07:05 PM
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Old 02-01-2013, 08:06 PM
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Originally Posted by Joe Perez View Post
driven by the steady dripping of water from a single orifice into a series of weighted containers which tip over and fill one another.
Sounds sexy when you say it like that.


You should have just said clepsydra.

Obligatory pic:

Last edited by sixshooter; 02-01-2013 at 08:17 PM.
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Old 02-02-2013, 06:30 AM
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Its funny i thought of the drinking bird too when he said that.

anyhow
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Old 02-02-2013, 11:40 AM
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Old 02-02-2013, 03:28 PM
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WIN:

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Old 02-02-2013, 09:19 PM
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Latest backyard project... this thing was 11yrs old and was in my neighbors backyard. It stood strong through 6 hurricanes and looked it.

They move and asked if we wanted it for our kids... hell yeah! About 5 hours of work, paint, some 2x4's, a roll of astroturf... I just won "DAD OF THE YEAR" again.
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Old 02-02-2013, 10:21 PM
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Lol Tim, I just played the enter sandman lullabye on my phone to put my kid to sleep. It worked like a charm!
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Old 02-02-2013, 11:14 PM
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Originally Posted by triple88a View Post
Its funny i thought of the drinking bird too when he
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Old 02-03-2013, 01:16 PM
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Old 02-03-2013, 03:25 PM
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Stancehunters bs but

*edit* repostrepostrespotstate


And I got a new fastback.
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Last edited by rccote; 02-03-2013 at 11:42 PM.
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Old 02-03-2013, 08:11 PM
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Old 02-03-2013, 09:00 PM
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Old 02-03-2013, 09:03 PM
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Old 02-03-2013, 10:18 PM
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My Miata does this

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