How ceramic backed precision thin film resistor networks are constructed and laser trimmed.
Examples come from the resistor networks in the 7.5 digit Keithley DMM7510 Multimeter, manufactured by Fluke.
Forum: http://www.eevblog.com/forum/blog/eevblog-730-thin-film-resistor-networks/
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Part 5 - Doug Ford explains the design of Electret Microphone circuits, and all the associated traps:
Transconductance, correct biasing, and temperature effects, leaky JFETS, non-linear clipping & headroom, current noise and voltage noise, and pseudo bias resistors.
Also, the non-intuitive concept of higher resistance = less noise, and how this applies to electret biasing.
And what is a soggy circuit board and why is it important?
Forum: http://www.eevblog.com/forum/blog/eevblog-611-electret-microphone-design/
All the microphone series videos are here: http://www.youtube.com/playlist?list=PLvOlSehNtuHv98KUcud260yJBRQngBKiw
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Dave talks about Tektronix's new unreleased AGO3000 Gravity Compensated Oscilloscope with a high precision TCXO timebase with 2G tip-over gravity compensation.
Datasheet: http://info.tek.com/rs/tektronix/images/AGO3000_Gravity-Compensated-Oscilloscope_DataSheet.pdf
Preliminary product launch page: http://info.tek.com/ago3000-scope.html
Forum: http://www.eevblog.com/forum/blog/eevblab-8-new-tektronix-ago3000-oscilloscope/
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Review, teardown, and testing of the Rhino Tools ZD985 desoldering station on typical through-hole double sided and multi layer PCBs.
http://www.rhinotools.com.au/vacuum-desoldering-station/152-rt985-vacuum-desoldering-station.html
http://www.china-zhongdi.com/2013/?p=121
Forum: http://www.eevblog.com/forum/blog/eevblog-542-zd985-desoldering-station/
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Fundamentals Friday
What is Sheet Resistance?
Did you know that the resistance of a square copper PCB trace is the same regardless of the size?
Dave explains the theory behind this rather counter-intuitive concept called Sheet Resistance, and demonstrates that it is in fact true.
What is the ohms per square of 1oz copper-clad PCB material and how can you use this concept to calculate the resistance of a PCB trace?
Thin Film Precision Resistor Network video: https://www.youtube.com/watch?v=Rxy-VpSDPg4
Forum: http://www.eevblog.com/forum/blog/eevblog-732-pcb-sheet-resistance/
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Teardown Tuesday
What's inside a modern LED backlight LCD panel from a 27" computer monitor?
Forum Topic: http://www.eevblog.com/forum/blog/eevblog-465-led-lcd-panel-teardown/
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