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For tinfoil hat, sky is falling, elec. Co. conspiracy guys.

B

Bob

Well-known Member
I mentioned in a previous thread about two identical, new, digital timers, plugged into the same outlet, that were set to the same EXACT minutes/seconds, but one hour "off" (DST and standard time)and the "Set" buttons released at the same instant... over several months they have drifted a couple of minutes apart... must be those SNEAKY power co. guys playing with the 'ol line frequency, don't you think???? :shock:

Here's a (poor quality) photo from earlier tonight...

6rhac1.jpg


http://ytforums.ytmag.com/viewtopic.php?t=834275&highlight=
 
Shouldn't they both read the same, regardless of whether or not the line frequency has drifted? You need to compare the time on a clock that runs off line frequency to one that's slaved to WWV.

It took me a little research, but I eventually found the instruction manual for your Stanley model 58424 timer.

From the instruction manual:

"Plug the timer into the wall and wait for at
least 30 minutes to charge the built-in
rechargeable battery. This will allow the
timer to be programmed and keep time even
when it is not plugged in. The timer must be
plugged into the wall outlet to operate your
lamp."

So it doesn't need to even be plugged into the wall to keep time. In other words, it relies on an internal time reference rather than the line frequency. You've proved that these units don't have very accurate clock crystals, but you haven't proven anything about the line frequency.
 
They probably have internal oscillators and are not tied to line
frequency. The internal oscillators will have drift.
 
"They probably have internal oscillators and are not tied to line frequency."

Since you are telling me something I already have figured out, I guess you didn't bother to read my post in the other thread I linked to???

(This was a tongue-in-cheek post directed at those in the original thread who seem to like to find conspiracy in EVERYTHING they deal with!)
 
Not crystals, PLL (phase locked loop) aka 555 chip. Crystals are pretty much passe ....

This whole thread is pretty funny, especially if you've ever been in a power house when they throw a generator on line a little out of sync.
 
A 555 timer (with which I'm very familiar) is not a phase-locked loop. It relies on an RC time constant and can be configured to operate as either an astable or monostable multivibrator. No one would use a 555 to operate a time-of-day clock; it's not stable enough for that.
 
(quoted from post at 21:34:31 11/06/11) A 555 timer (with which I'm very familiar) is not a phase-locked loop. It relies on an RC time constant and can be configured to operate as either an astable or monostable multivibrator. No one would use a 555 to operate a time-of-day clock; it's not stable enough for that.
Click to expand...

I used to use them to make pulse width modulators years ago.
 
Mark is right - about 555 timer, built enough timer circuits with them to be sure they aren't that accurate. They take their timing based on charge/discharge cycles of capacitors. Capacitors can be poor choice for such service. Heath Kit made a bunch of touch-tone modules from them, and they proved very inadequate. Decoders souldn't respond reliably, next generation of Heath was crystal controlled.
 
Coulden't be a conspiracy. There's a perfectly logical explanation.(as alway's)

What happened was you used a double outlet. The outlet closest to the LV terminal got the electrons first & the second outlet got what the first one didn't use. This tiny drop in electron flow is why the second clock coulden't keep up over a long period of time. See, there's no conspiracy. lol
 
The aliens (the green ones, not the Mexicans) must have sneaked in and shut down one of those timers for a few seconds every day or so. Those sneaky little you-know-what's are notorious for such pranks. They were waiting for you to finally notice, and this morning they are all laughing about it.
 
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