EEssential
The essence of electrical engineering.
Wednesday, December 30, 2020
AC Termination
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In the case of the RS422 circuit, the differential line impedance is around 100$\Omega$ and "Standard RS-422 drivers are guaranteed ...
Friday, December 25, 2020
Christmas LED Lights
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I have a string of 60 LED Christmas lights with 6 distinct colors. I measured the RMS current with a multimeter, and found to be 27mA, so i...
Thursday, December 10, 2020
Anti Sulfur Chip Resistors
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Many automotive grade chip film resistors have the anti sulfur feature. Bourns has a white paper, "Advantages of Sulfur-Resistant Fi...
Thursday, August 27, 2020
Computer Software Notes
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Windows Change network setting with commands netsh interface ip set address "Local Area Connection" static IP NetMask Gateway ...
Monday, August 3, 2020
Tile Tracker
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Powers off 3V CR2032 lithium coin battery One piezo buzzer Toshiba's TC35678FSG BLE 4.2 Cortex-M0 (13 or 26MHz) 384KB ROM, 192KB RAM, ...
Monday, July 20, 2020
FPGA Design on Linux
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I'm dusting off an old Digilent Nexys 2 board with a Xilinx Spartan 3E FPGA. The older FPGA devices are not supported by Xilinx Vivado,...
Monday, June 1, 2020
Router
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I finally retired a ten year old router which can no longer support the speed from the cable modem. It has been running DD-WRT firmware; no...
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