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17 Dec 2014

by Afrotechmods @ youtube.com

A beginner’s guide to different battery chemistries and how to choose the right battery for your project.

How to choose a battery: A battery chemistry tutorial - [Link]

17 Dec 2014

point-contact-transistor-290

by Jessica MacNeil @ edn.com:

What began as research to improve telephone service became one of the most important inventions in electronics history.

In 1945, AT&T’s research division, Bell Labs, began working on technology to replace vacuum tubes and make long-distance telephone service more reliable. William Shockley organized a solid-state physics group to research semiconductor replacements for vacuum tubes and electromechanical switches.

1st successful test of the transistor, December 16, 1947 - [Link]

2 Dec 2014

setup-600x450

Kerry Wong writes:

Hysteresis can be added to a comparator circuit to improve its stability, especially when the input signal is noisy. In this post, we will examine the hysteresis characteristics of some common comparator and Op Amps using an oscilloscope.
Perhaps the most intuitive way to visualize the hysteresis in a circuit is to plot the input signal (x axis) against the output signal (y axis). So, if we sweep the input voltage we should be able to see the characteristics of the transitioning of the output voltage due to hysteresis.

Visualizing comparator and Op Amp hysteresis - [Link]

22 Nov 2014

by w2aew @ youtube.com:

Today’s “Back to Basics” tutorial topic – why flyback or snubber diodes are used around relay coils when switched or controlled by low power electronics. We’ll talk about how and why dangerously high voltages can be generated from the collapse of the stored magnetic energy in the coil when they’re switched off, and how the diode can protect the low power electronics from being damaged by these high voltages. Some voltage and current measurements are made on an actual circuit to see the real-world effects.

Why diodes are used around relay coils - [Link]


24 Oct 2014

BH Figure 1cx600

 

by Barry Harvey @ edn.com:

We analog designers take great pains to make our amplifiers stable when we design them, but there are many situations that cause them to oscillate in the real world. Various types of loads can make them sing. Improperly designed feedback networks can cause instability. Insufficient supply bypassing can offend. Finally, inputs and outputs can oscillate by themselves as one-port systems. This article will address common causes of oscillation and their remedies.

Does your op amp oscillate? - [Link]

29 Sep 2014

ap_NXP_an10853

A good beginner app note (PDF) from NXP on protecting ICs from ESD.

Integrated circuits are sensitive to electrostatic discharge (a sudden and short-time flow of currents) and electromagnetic fields (at which they can be source or victim of both of it). This application note shall be understood as an introductive basic description of what electrostatic discharge is, how sensitive devices can be protected against electrostatic discharges, what electromagnetic compatibility means and how electromagnetic sensitivity can be tested.

[via]

App note: ESD and EMC sensitivity of IC - [Link]

22 Sep 2014

by w2aew @ yoututbe.com

Op amp gain-BW product and slew rate limiting are defined, discussed and demonstrated on the bench. This discussion applies to the majority of general purpose op amps on the market – as most op amps are internally compensated with a single dominant pole. High speed op amps, unconditionally stable op amps, non-unity gain stable op amps, high power opamps, etc. may not follow these characteristics because they are often compensated differently in their design. An LM358N is used for the example circuit. Other popular op amps like the LM741, etc. will behave in a similar way. Sometimes the slew rate limit of a device will be the dominant factor in determining the bandwidth, and other times the gain-bandwidth product will determine the resulting frequency response. The video demonstrates why this happens.

Basics of Op Amp Gain Bandwidth Product and Slew Rate Limit - [Link]

9 Sep 2014

How Ferrite Beads Work – EMI Suppression - [Link]

29 Aug 2014

DI5426f1h

by Einar Abell:

This Design Idea demonstrates a simple way to generate a multiphase clock signal, the frequency of which can be varied with minimal change in phase shift(s).

The phase shift of the second output can be tuned from near zero to 180° without affecting the frequency. The basic circuit uses a minimum of parts: one cap, two resistors, plus two Schmitt triggers.

Add phases to simple RC oscillator - [Link]

20 Aug 2014

photo-main

Open Analog is an organization dedicated to exciting makers about analog hardware. We make popular ICs into transistor level kits!

 The first Open Source analog IC kit from Open Analog has been created, assembled, and verified. We call it the SevenFortyFun and it is a transistor level op amp kit. You can finally get the chance to understand whats going on inside those ICs! Now we need your help to proto the next revision (I gotta eat somehow!). This Kickstarter campaign is to raise money in order to print the first batch of PCBs and order parts for production volume.

741 Op-Amp Kit - [Link]



 
 
 

 

 

 

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