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© Mark Biegert and Math Encounters, 2013. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Mark Biegert and Math Encounters with appropriate and specific direction to the original content.
Monthly Archives: December 2010
Dual Modulus Counter Design Example
Introduction One of the more common problems in the life of a digital hardware designer is to divide down a master clock to some desired lower frequency value. If life is kind, the master clock is an integer multiple of … Continue reading
Little Stories from the History of Science and Technology
Introduction I have always been interested in the connectedness of people. The theory that each of us is separated by only six degrees from anyone else is a theory I like to test. If you examine things carefully, you may … Continue reading
Test Time and Estimating Bit Error Rate
Introduction Test time is expensive. Since our products need to conform to industry standards for Bit Error Rate (BER), we need to test for BER. It is important that we test long enough to ensure that we meet the requirements, … Continue reading
Calculating the Earth’s Age
Introduction I have been listening to the audio book The Disappearing Spoon, which is an excellent tale about all of the elements of the periodic table. Of particular interest to me was the discussion of how geologists date the age … Continue reading
Power Dissipated in a Maximum Phone Load During Ringing
I am writing a specification this morning and I realized that I have never calculated the maximum power drawn by a phone during ringing. I was surprised by the number – 3 W. This is a lot for unit that … Continue reading
Posted in Electronics
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Thermal Runaway Model of Lead-Acid Battery (Part 2)
Derivation of the Output Power Equation The output power equation (Equation 3) is really a restatement of Newton’s law of cooling. Equation 3 states the battery’s steady-state power dissipation is a linear function of the battery’s temperature and the ambient … Continue reading
Thermal Runaway Model of a Lead-Acid Battery (Part 1)
Introduction Very nearly every product we make ships with one or more lead-acid batteries. Since we have built hundreds of thousands of units, that is a lot of batteries. While most people encounter batteries everyday, few really understand the problems … Continue reading
Posted in Batteries, Electronics
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Laser Failure Rate Estimate Example
Introduction I have spent some time lately talking to people about laser failure characteristics. Most electronic component reliability modeling is done using the exponential probability distribution, which assumes the components have a constant failure rate and there is no wearout … Continue reading
Calculating Drawer Heights
Introduction As you can tell from all the recent posts on construction, I am in the middle of planning some remodeling on my home. One of my projects includes designing a chest of drawers. It turns out that there are … Continue reading
