Johnson's Techworld

Maximum theoretical power conversion efficiency of a full-wave rectifier is 81.2%, while that of a half-wave rectifier is 40.6%. Remainder is lost as heat, mainly due to the

I was using a quarter century old linear power supply for my IC-2730A radio for Low Earth Orbit satellite operations, mostly through the Amateur Radio on International Space

Some time back I had posted about the popular 7805 Voltage Regulator IC and also demonstrated Voltage Regulation with IC 7805. That is a simple linear regulator. They

This offline UPS for my computer became a surplus item when I moved from desktop to laptop computer. It has been here for quite some time and battery

The output signal of a CE amplifier will be:a) 45 deg out of phaseb) 90 deg out of phasec) 180 deg out of phased) 270 deg out of

Though it is named as a ‘Selfie Stick’, I am not going to use it to take selfies! For me it is camera tripod and possibly a tripod

I was a regular AM or Amplitude Modulation operator in the initial days of my ham radio activity. Started by adding a modulator to the 7W VU2VWN QRP

Another session of ham radio exam preparation is here, with multiple choice questions followed by discussion with illustrations. The Transformer works on the principle ofa) Self Inductance b)

Actually it is the first time I am hearing about 6m EME, that too a DXpedition. Often I have heard of 432 MHz EME and EME on higher

Winter is approaching and we expect better contacts on lower bands like 80m and 160m. Only downside for propagation on lower bands now is the solar activity. With