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Sharp Model SPC033 gains 4 hours. Runs too fast.

AC 110 v 60 Hz 2W. Swivel base. Digitil red lettering. Runs too fast. How can I solve the problem?

Posted by Anonymous on

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Posted on Jan 02, 2017

Bogdan
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SOURCE: My digital alarm clock is fast

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

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What should i set the micro switch on the back at?


Power:
2 ohm stereo (per channel): 975W
4 ohm stereo (per channel): 660W
8 ohm stereo (per channel): 400W
4 ohm bridge-mono: 1950W
8 ohm bridge-mono: 1320W

Load Impedance: Safe with all types of loads. Rated for 4 and 8 ohms in Stereo mode, 4 ohms in Bridge-Mono mode

Voltage Gain to 1-kHz, 8-ohm rated output,
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100 Volts: 11.4 A;
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Why do my clocks run fast when my Briggs & Stratton 15kw generator is running?


Electric clocks use synchronized motors that run on 60 Hz AC. The power company provides AC power with a precisely regulated frequency of 60 Hz. That means that the voltage jumps back and forth (positive to negative) 60 times per second. Your generator would do the same thing if it could run at precisely 3600 rpm (that's rev's per minute) - but it can't, because the engine is not that precisely controlled. In your case it tends to run (on average) a little fast. I hope you found this helpful. By the way, in Europe 50 Hz is the norm. If you run a clock designed for 50 Hz on 60 Hz power, it will run 20% too fast! Al K

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1 Answer

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Honeywell Ceramic Heater (HZ-370) does not swivel anymore


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2 Answers

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Need to Upgrade Hard Drive & Memory for Sharp PC-UM10M


SHARP PC-UM10 SPECIFICATIONS

CPU Ultra Low Voltage Mobile Intel® Pentium® III processor 600 MHz-M Memory 128 MB SDRAM, not expandable (model PC-UM10) 256 MB SDRAM (model PC-UM10M) Video ATI Rage Mobility M (including 4 MB video RAM) Display 12.1" XGA AGLR TFT LCD (1024 x 768) Hard Drive 20 GB Pointing Device Glide pad (touch-sensitive control pad with 2 buttons) PCMCIA 2.1 Card Slots Type II x 1, CardBus port supported Audio System Monaural microphone and monaural speaker, sound system compliant with AC 97 I/O Ports USB, LAN, modem, headphone, microphone, DC in, expansion port for port bar Modem 56Kbps (V.90) LAN 100Base-TX/10Base-T AC Adapter 100-240V, 50-60 Hz Battery Rechargeable lithium ion battery Battery Life Standard battery - approx. 3 hours. Optional extended life battery (CE-BL18) - approx. 9 hours. Battery life is based on ZD Battery Mark 4.01. Battery life may vary based on actual usage. Dimensions 11.1" x 9.1" x 0.65" (min)/0.77" (max), 282mm x 232mm x 16.6mm (min)/19.6mm (max) Weight 2.89 lbs., 1.31 Kg Operating System Microsoft® Windows® 2000 Operating Environment Temperature: 50°F to 95°F (10°C to 35°C) Humidity: 20% to 80% (non-condensation) Power Consumption Max. 40W Available Options Extended Life Battery CE-BL18 Optional longer life battery 6X CD-ROM Drive CE-CD05 External USB CD-ROM Floppy Drive CE-FD04 External USB Floppy Drive Port Bar CE-PB01 Provides additional I/O ports



Design and specifications are subject to change without prior notice. Some options may not be available in some regions.

 

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Oct 22, 2007 | Sharp PC UM10M Notebook

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