EEssential

The essence of electrical engineering.

Wednesday, November 19, 2025

LED Flashlight Again

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I wrote about some LED flashlight that I built  or purchased many years ago.   Recently the incandescent bulb on my Garrity flashlight burn...
Thursday, November 13, 2025

Testing Antonki Thermometer/Hygrometer

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 Antonki Thermometer/Hygrometer is sold at $8 for two.  It claims a temperature range of -50 to 70°C (-58 to 158°F) with accuracy +/-1°C and...
Tuesday, October 14, 2025

A Toaster Oven

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 A very simple toaster oven costs about $20.  While the most consumer electrical appliances have microcontrollers inside and some are intern...
Monday, September 22, 2025

LED Fluorescent Tube Replacement

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 The once ubiquitous fluorescent light tubes are gradually being replaced by the LED light.  The once popular compact fluorescent bulbs are ...
Friday, September 19, 2025

NVMe Speed Test

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 The computer peripheral bus is eventually settled on PCIe and one small form factor expansion card is M.2 which provides up to 4 PCI expres...
Thursday, September 11, 2025

Quotes

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"My Favorite Programming Language is Solder." - Steve Ciarcia Also atrributed to Bob Pease, Terry Pratchett, and others     "...
Friday, August 29, 2025

Boltpower K-3 Jump Starter

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 Product specifications (on the case):      Capacity: 12000mAh      Lifecycle: above 1000 times      Output: 12V      USB Port: 5V 2.1A/1A  ...
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