Rohde & Schwarz

LED Characteristics and Colours

A summary of different LED characteristics - colour, voltage drop, intensity, etc arising from the different materials and fabrication technologies used.

Cell phone electronics basics

A summary or tutorial about the basics of cell phone electronics and what is contained within a mobile phone.

HF Ionospheric Radio Signal Propagation

An overview of HF ionospheric radio propagation for prediction and network planning, detailing the way in which radio signals are reflected or refracted over vast distances around the earth on the short wave or HF bands using the D, E and F layers in the ionosphere.

Facts of the day

6 July 2015

Quote - Education is the most powerful weapon you can use to change the world. - Nelson Mandela

Fact - There are several words that contain the five vowels in order: abstemious and facetious. Other specialist words include: acheilous, anemious, annelidous, arsenious and caesious


Inverting Operational Amplifier Circuit

Circuit and design details for an operational amplifier, op-amp inverting amplifier configuration, allong with its use as a summing amplifier / virtual earth mixer.

Capacitor Dielectric Constant and Permittivity

Description of capacitor permittivity and dielectric constant with equations and a table of values for common materials and substances. news from

Using Digital Control Designs for Stable Power Supplies
Find out how to achieve stable power supply designs with fast transient response by using digital control techniques in this whitepaper from Intersil.

More whitepapers

Filter Design for Satellite Communications: Helical Resonator Technology
Filter Design for Satellite Communications: Helical Resonator Technology

Efstratios Doumanis, George Goussetis, Savvas Kosmopoulos
Filters provide an essential function for many forms of RF circuits and in...
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