EEssential

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 ...

The basic solid state amplification devices are bipolar, JFET and MOSFET transistors.  All of them can be considered as transconductance ...

When charging my tablet using a bench supply, I notice that it only draws 0.45A, staying within the 0.5A limit.  But the tablet is capable o...