Chaney Instrument 66702 Mercury Black Digital Alarm Clock Logo

Question about Chaney Instrument 66702 Mercury Black Digital Alarm Clock

1 Answer

My digital alarm clock is fast

I have an digital alarm clock (AC 220v) HOSEKI, looks like Chaney 66702, it was a gift from a family member. From very beggining it already runs fast, every day (24 hours) it gains one more minute. Do you have any solution by adding some resistors/diod or capacitor-circuit to make it run more accurate? Appreciate much your help. Thank you. Thanh

Posted by Thanh Dang on

Ad

1 Answer

Anonymous

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 198 Answers

I'm not on this field of expertise but I could try giving you some tips. These cloks work by dividing the natural oscilations of a quartz cristal in the corresponding way to form "1 second". A quartz cristal like the one in your clock will oscilate at about 14080236 times per second. Your clock uses a specialised chip in order to count these oscilations and know they form "1 second". However, the problem is the following. These clocks doesn't compensate for frequency variation over the mains power line. You should always look firts at it's power ratings and determine if it requires 50Hz or 60Hz. Even if you use an adaptor to raise/lower the tension from 110 to 220 v or viceversa, this woun't correct the problem as the adaptor will leave the frequency unchanged. Unfortunately in order to make the required adjustments you woun't need a resistor or capacitor, but a whole bunch of them in order to make a frequency divider-convertor that's stable enough to give your clock a fixed time reference. One more thing, not all components have exactly the parameters noted on them. There's another thing called Tolerance. A 1Kilo Ohm resistor with 10% tolerance (most comon tolerance) can have any value with +/- 10% of it's noted parameters, and in this example, could have any value between 900 ohm - 1100 ohm. These clocks will need components with a very strict tolerance in order to have an acurate time reference. Note that they aren't atomic clocks, they simply use a larger chip that includes most of the clock, time reference, frequency analyser and divider. An atomic clock doesn't use quartz cristals, instead it relies on the natural oscilations of the very precise Cesium izotope atom. The rest of the atomic clock is made up in a similar way as usual clocks (more fixed and small tolerance of course :) ).

Posted on Jul 02, 2007

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

0helpful
1answer
0helpful
1answer

Can I use the leviton 15A-125V adapter to a 220V wall socket?

Not an adapter. You need a voltage converter to convert 220Vac to 120VAc.
0helpful
1answer

Clock 13003-7-2-ac

take it back to the shop it came from to et it manufunctured or fixed
3helpful
1answer

My sony radio alarm clock is too fast about 1 hour. i have moved in the philipines. but my alarm clock is working too fast; ie, it does not show the exact time (about 70-80 minutes) faster

alarm clocks works on frequency and not only on voltage.if it is original 110v 60htz and you trying with 220v 50htz supply then it wont work correctly
13helpful
2answers

Timex Indiglo, model T560B natural sounds alarm clock radio

Press alarm set button, time display will blink. Then press off/reset button to toggle hourly beep on/off.
11helpful
2answers

I can't set the day.

You have to set the Year. Hold the time Set until the hours blink then push the time set button again and the minutes blink then push the time set button again and the year will blink. Change it to 09. Then push the time set button again and set the date.
0helpful
1answer

Setting clock

I think I solved the problem, take out the batteries and reinstall and then reset, seems to be doing ok now.
3helpful
1answer

Time zone

Hi - You can download the manual from the link underlined in blue below:

Chaney

5dd20ad.jpg

Please take a moment to rate this solution & let us know if the information given was useful to you - Good Luck!
Not finding what you are looking for?

669 views

Ask a Question

Usually answered in minutes!

Top Chaney Instrument Audio Players & Recorders Experts

Ekse

Level 3 Expert

13435 Answers

The Knight
The Knight

Level 3 Expert

76843 Answers

Marvin
Marvin

Level 3 Expert

85240 Answers

Are you a Chaney Instrument Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...