EEssential

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...

One of my computers had a CMOS checksum error and waited for me to press a key to proceed.  I usually talked to this computer running Linux ...

I recently had to develop code for the AT91SAM7 microcontroller.  AT91SAM7 has an ARM7TDMI processor core, an architecture that has been sup...