Question about Discovery Channel Audio Players & Recorders
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Posted on Jan 02, 2017
They used to use crystals to help the timer ics to keep time but since the development of Micropros. all this is built in to one chip. Now they will use a resonator or a small crystal for the timing clock of the micro but nowdays the manufacture uses that clock to keep all in check. If your gaining time you probably are having problems with your ac duty cycle as this also keeps clocks in check.. This would not affect most devices but could be a problem. But of course a defective Micro could also cause this gain in time And probably is?? Now a battery backup is nothing more then a battery in line with the Microproccesors B+ terminal through of course a diode as well as a voltage limiter resistor to take over the B+ when the units ac supply is absent..
Posted on Mar 24, 2006
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
The E means you have tried to put an MP3 CD into it and it didn't work. There is a button atop the clock radio that allows you to fade the backlight.
Posted on Mar 26, 2009
I recently had the same problem with my GE model 7-4966 clock radio. The radio manual states that there is a spare bulb included and stored on the underside of the battery compartment door on the bottom of the clock radio.
To replace the bulb:
1. Twist the bulb bar handle on the underside of the radio to unlock and remove the holder.
2. Carefully pull the bulb out of the holder and replace with the spare bulb.
3. Place the holder back in place, twist the bar handle to the right to "lock" the bulb holder in position.
In case you can't find a spare bulb, the manual states "use only a GE259 or equivalent 6.3 volt, wedge base bulb. A clerk at Radio Shack told me she could get a replacement bulb.
Posted on Jul 27, 2009
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