EEssential
The essence of electrical engineering.
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
Monday, April 2, 2012
EEssential Weekly Notes #6
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ChipQuik The normal solder (63% Sn 37% Pb) has a melting temperature of 361F (183C). ChipQuik has a very low temperature solder (48% Sn 2...
Monday, March 26, 2012
EE Notes
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Motor winding insulation temperature ratings NEMA classes are A (105C), B (130C), F (155C), H (180C). Class B is the most prevalent since...
Sunday, March 4, 2012
EEssential Weekly Notes #5
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Ferrite bead vs Inductor The ferrite bead is lossy at high frequencies, i.e. low Q or resistive. The high frequency energy are absorbed a...
Sunday, February 12, 2012
PCB Layout: Basics
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PCB layout generally is not a task that many EE's are proficient at. They may even consider it somewhat beneath them and it is the work ...
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