EEssential

As I was pleased with the OrangePi PC module, I purchased another OrangePi product, OrangePi Prime for $35, about doubling the price of Ora...

I talked about the  Cen-Tech multimeter , which was a little better than expected.  Another cheap multimeter is DT9205A.  There are actually...

The OrangePi PC based on Allwinner H3 SOC, a quad core ARM Cortex-A7 processor, with 1GB DDR3 SDRAM, selling for $15 (plus $3.35 shipping) i...

I have a Bluetooth headset that is 7-8 years old.  I used it occasionally in the car.  It just quit completely and could not be charged.  I...

Previously, we made a PS2 keyboard emulator .  Here we are going to create a USB keyboard that makes easy to control another PC from a lapto...

The cheap LED light simply drives a parallel string of white LEDs with two or three batteries.  There is no other circuit elements, not eve...

The notebook computers nowadays tend to have only one audio jack, a headphone and microphone combo.  It has four connections and requires a ...