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14 Jul 2015


by Norm Quesnal @ digikey.com:

Thermal Conductivity: A measure of the ability of a material to transfer heat. Given two surfaces on either side of a material with a temperature difference between them, the thermal conductivity is the heat energy transferred per unit time and per unit surface area, divided by the temperature difference.

Thermal Conductivity: What is it and Why You Should Care – [Link]

30 Jun 2015


by Eric Bogatin @ edn.com:

The dB (decibel) is one of the most common units in engineering, yet also one of the most confusing, especially when it comes to manipulating S-parameters. Here is how not to be confused.

The Bel is a fundamentally new unit, which was originally established in 1928 by The Bell System to describe sound levels. This scale has since been generalized to relate to the log of the ratio of any two power levels.

The most important principle of the Bel scale to keep in mind is that it is, without exception, by definition, the ratio of powers. It originally related to sound level powers, but has since been generalized to all types of powers.

How to think in dB – [Link]

27 Jun 2015

by w2aew @ youtube.com:

Tunnel diodes are a bit rare these days, but still have uses in special applications including extremely high frequency oscillators, etc. They were commonly used in microwave circuits, oscilloscope trigger circuits, and other applications. This video reviews the basics of tunnel diodes, including the basic properties and simple applications. I refer to these as the “bucking bronco” of diodes because of the IV curve that jumps around, and the fact that these diode will jump into wild oscillation if you just look at them funny!

Basics of Tunnel Diodes and their applications – [Link]

18 Jun 2015

A tutorial on zener diodes and how to use them as voltage clamps, voltage regulators, and how to create audio distortion circuits.

What is a zener diode? – [Link]

11 May 2015

The digital multimeter (DMM) is an essential tool in every electronic enthusiasts arsenal.

SparkFun How to use a Multimeter – [Link]

9 May 2015

Dave explains why some designs have electrolytic capacitors connected in parallel. The answer is more in-depth than you might think.
9 reasons are given and explained, and then some thermal camera fun on the bench.

EEVblog #742 – Why Electrolytic Capacitors Are Connected In Parallel – [Link]

22 Apr 2015



Using Part-Sim we can verify the response of this RL circuit, and our calculations for the initial, final, and the transition between those conditions.  While analyzing this circuit’s response on paper and in Part-Sim, we must use the initial conditions (time and V) and component values.  In Part-Sim setting up the switch is the hardest part; with the simulation requiring set up of a voltage controlled switch and AC source with a pulse to get the correct behavior in the circuit.  Web based Part-Sim allows you to simulate and verify your calculations any time.

Response of a 1st order RL circuit – [Link]

20 Apr 2015


The Chebyshev filter features a steep roll-off, but has ripple in the pass band, so it is not suited for audio signal use, where a flat response is ideal. The roll off is so fast that the common definition for cut-off frequency does not work for Chebyshev filters.  For this type of filter the cutoff is defined as the frequency at which the response falls below the ripple band. This filter is good for removing harmonics and intermodulation in RF applications.

1kHz Chebyshev Filter – [Link]

28 Mar 2015

The most often requested video! In this tutorial Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configurations are also explained.
Then a practical breadboard circuit to demonstrate a virtual ground and the effect of voltage rail limitations.

OpAmps Tutorial – What is an Operational Amplifier? – [Link]

26 Mar 2015


In semiconductor and electronics industry, a diode is a widely used discrete component. It is a significant element in many electronic circuits and applications ranging from low power signal circuits to power rectification. Based on the functions and ratings, there are different types of diodes. However, all semiconductor diodes contain a PN junction to perform their basic operation.

Diodes – Types and Applications – [Link]





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