EEssential

BeagleBone Black is a nice little board, but mine came with no HDMI display: the monitor could not detect a HDMI signal.  I tried different ...

I read the 2nd edition from cover to cover in about 10 years.  And I just read the 3rd edition in about one week.  I used to say everythin...

Power Supply This particular PC power supply is rated 230W: 5V@23A, 12V@9A, -5V@0.5A and -12V@0.5A.  There is no 3.3V output. I...

Some clever folks posted the parabolic antennas made from beer cans.  It is quick and easy to do.  I made one for my router.  Although the g...

Here is a white LED driver circuit for four 1W white LEDs powered by one Li-ion battery cell.  It is a boost converters with current limit t...

The recent release of ESP8266 has opened new possibilities for the age of IoT.  Its low-cost, versatility and simplicity make it instantly p...

Here we consider a half-bridge circuit, which could be used in a motor drive or synchronous switching regulator. The first thing to con...