EEssential
The essence of electrical engineering.
Thursday, March 14, 2013
Noise Gain
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The term "noise gain" is used a lot in designs with opamps. So what is noise gain and how is it useful? If we model the opamp n...
Friday, January 4, 2013
Cheap Cen-Tech Multimeters
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The Harbor Freight Cen-Tech multimeter is about $4 or less. It measures voltage to 1000V DC/750V AC, current to 10A DC, resistance to 2MOhm...
Wednesday, September 19, 2012
Components Review
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Here I give a review of electronic components that I used, particular on their quirks. Atmega644A Atmega644A has the same peripherals as ...
Friday, September 14, 2012
Observations
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"An engineer has probably about 8 productive hours in a week. So why do we work 40 hours? Because we don't know when the 8 produc...
Sunday, July 15, 2012
UART clock tolerance
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The clock tolerance issue is analyzed in the Maxim App Notes 2141. Assuming 16-clock sampling scheme, the tolerance is +/-5 clocks for nomi...
Tuesday, June 26, 2012
Approximations and Rules of Thumb
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Pi seconds are a nano-century. (pi ~ 3600 * 24 * 365 * 100 * 1e-9) Maximum current on PCB trace: 500mA per 10mil 1oz trace. PCB 1oz res...
Saturday, June 2, 2012
EEssential Weekly Notes #7
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From Vishay App Notes, the thermal resistance of SMT resistors
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