Johnson's Techworld

Which was the simplest VHF antenna I ever made?

Radio needs an antenna for communication with other radios. Simple and easy to construct antenna is a half-wave dipole antenna. It can be mounted horizontally or as in

According to the information posted on Department of Science and Technology website, research team at the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), an autonomous institute of

Sodium-ion battery is one of the latest additions to rechargeable batteries. Main advantage is that the raw materials are abundant and easily available on Earth, compared to lithium

ESR stands for equivalent series resistance in case of a capacitor or inductor. It can be considered as the internal resistance of a capacitor. Low ESR capacitor allows

I had discussed about Gamma match and practical implementation of Gamma match earlier. A short mention of Beta match or Hairpin match was also there some time back.

What is the power of a device running at a voltage of 13.8 volts DC using a current of 10 amperes?a) 138 wattsb) 0.7 wattsc) 23.8 wattsd) 3.8

String inverter is used to convert direct current produced by a string of solar panels into alternating current for consumption or feeding to the electrical power supply grid.

In case of a solar panel, 500Wp means 500 Watts peak (Wp), which is the maximum power it can produce under ideal standard test conditions. Typical ideal standard

Leonids meteor shower is expected to peak around November 16-17, in 2025. Leonids meteor shower is supposed to be the fastest meteor shower and radio amateurs are preparing