EEssential
Electrical Engineering Essentials
Tuesday, May 13, 2025
USB current/energy meter
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$4.79 (+shipping and tax for $7.23 total) Shenzhen Rongbo Jiachuang Technology Co, before the tariff was imposed on the Chinese goods. The d...
Friday, May 9, 2025
MicroPython On STM32F429 Discovery
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We try out MicroPython on STM32F429 Discovery kit. We pull the MicroPython v1.25.0 source code from github. First `make -C mpy-cross` to ...
Friday, April 11, 2025
A Portable LED Lamp
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A foldable LED lamp that is powered by USB costs as little as $3-4. The overall design seems relatively pleasing; the foldable and adjusta...
Thursday, March 20, 2025
Howland Current Source Impedance
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Here we derive the source impedance of the Howland current pump. The ideal current source impedance is infinity. The Howland current pump...
Sunday, March 16, 2025
A Current Source Circuit
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As an application example, the data sheet of a shunt voltage reference presents an 1mA precision current source as shown here, Normally, t...
Tuesday, January 21, 2025
NAND and NOR Flash
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The two types of flash memory devices, NAND and NOR, are familiar to people in tech. Most people understand the difference between the two...
Tuesday, December 31, 2024
USB -C Hub HDMI Failure
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VAVA 7-in-1 USB C hub VA-UC017, 3x USB 3.0 5Gbps USB A ports, SD/uSD card slots, HDMI, PD charging port 100W max. $25, 100x40x13mm, 60g (...
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