Electronics Engineering Magazine

Wednesday, August 13, 2014

Analog Electronic Circuit Design

The very first designs that came about were analog designs, a Vacuum Tube amplifier is an example. Analog is the representation of data or physical parameter in an accurate and precise decimal number like + 72.182 mV. The greater the resolution required, the more demanding is the design for achieving high accuracy and low drift. Digital circuits have only two voltage levels, high and low, the third state of floating, Hi-Z or high impedance is only for multiplexing or sharing a bus. This is done so that devices dont drive into each other and it is also used in external port drivers.

As an analogy, see the conventional water tap as an analog control, an electric light ON-OFF switch as a digital control.

Bob Pease - Analog Guru

Among the semiconductor products Bob designed are temperature-voltage frequency converters used in groundbreaking medical research expeditions to Mt. Everest in the 1980s. He also designed a seismic pre-amplifier chip used to measure lunar ground tremors in the US Apollo moon landing missions. Among his more memorable designs are the LM331 voltage to frequency converter and the LM337 adjustable voltage regulator. - Remembering Bob Pease

Bob Pease - Analog Guru

Even in digital, going from a low level say 0V to a high level say 5V is not instantaneous, the side of the square wave or the rising edge is not as straight as it looks. On zooming only the edge, you see that it is also an analog phenomena. The 'square wave' itself appears to be a summation of many sine waves, 'harmonics'. This is because nature is analog, the sine wave is analog, the movements of the planets or even the spin of electrons in an atom too.

After the handheld Abacus calculator (low-power, durable, bio-degradable), Mechanical and electro-mechanical computers were made and studied, The very first electronic computers were Analog Computers using an opamp as a building block.

Then came huge Digital Computers, Later LSI and other Microelectronic Innovations have precipitated handheld computers.

Have a look at Op Amp Applications Handbook

The Rising edge of the square wave depends on the Transient Response of the devices, the slew rate and bandwidth too. Fast Op-Amps are required for many applications, in switching and also AC amplification. Beyond that, study goes into Power Electronics and RF-Microwave which are specialized extensions of Analog. Similarly study of Digital Circuits extends into Computers.

Analog Design and Circuits

Analog Circuits Instrumentation
Circuits in Above
Updated Aug-14
Anantha Narayan

Saturday, August 09, 2014

Astable Multivibrator with 555

This is a demo of the popular 555 timer. you can try out the project on this page by a javascript simulation.Press the Red button below to turn on the circuit press it again to turn off. The 555 can source (LED2) or Sink (LED1) upto 200mA.

It can even drive a small motor or lamp with diodes added to protect from inductive kickback.Vary Ra, Rb and Ct with the controls given and see the change of frequency, period and duty cycle.

Astable Multivibrator with 555 

This is a tutorial with calculator to help learn the application of 555 which is a very rare chip innovation. It is simple, versatile, flexible and programmable (by tweaking of pots).

Astable Multivibrato xml code

If you are starting with electronics, this is the first step. So do it now ! Do-It-Yourself.
Screenshot of Astable 555 Timer Flasher

Astable Multivibrator with 555

Thursday, August 07, 2014

Mooshimeter - Smartphone DMM

Measure 600V and 10A with 24 bit resolution through 50 meters of space and 6 months of time

"A wired meter forces you to get up close and personal with what you are measuring. This can be a mild inconvenience or downright dangerous. The wireless link provides you the freedom in your measurements..."

Mooshimeter - Smartphone DMM

The Mooshimeter makes multi-channel measurements possible in situations that are too fast, too slow, too sensitive or too dangerous to use a traditional multimeter. A SmartPhone with an App does the job in Tandem with the Measurement Hardware Box with the Probes.

Mooshimeter - Smartphone DMM

(Please always use external shunts, current transformers, sensors, attenuators to measure High Energy Parameters - means High Volatge, High Current, High Frequency or a combination of them. - ananth delabs)

Specifications Include
  • Up to 600V, DC or peak AC 
  • Better than 0.5% accuracy DC
  • Better than 1.0% accuracy AC 
  • 10 Megaohm input impedance
  • 1% accuracy over 20 Ohms – 20 Megaohms
  • 8kHz dual simultaneous sampling
  • Up to 10 Amps 1% accuracy
  • Bluetooth Low Energy Radio

Wednesday, August 06, 2014

Philips - Tech Innovator and Inventor

Royal Philips Electronics of the Netherlands is a global leader in healthcare, lifestyle and technology, delivering products, services and solutions through the brand promise of "sense and simplicity".

Philips - Tech Innovator and Inventor

The company was founded in 1891 by Gerard Philips, a maternal cousin of Karl Marx, in Eindhoven, the Netherlands. Its first products were light bulbs 'and other electrotechnical equipment'. Its first factory remains as a museum. Koninklijke Philips Electronics N.V. - Wikipedia

Vintage Philips Tape Recorder Transistor based

(I have fixed some of these decades ago, if i remember right, it had only transistors, no chips. I am not sure if it was only germanium transistors, but i used both silicon and germanium devices to repair - ananth)

Vintage Philips Tape Recorder Transistor based

Discover everything you need to know about the LED phenomenon. What is a LED? How does it work? Learn about the LED basics

Philips - Tech Innovator and Inventor
From Components and Materials - Industrial Electronics and Instruments

Tuesday, August 05, 2014

General Electric Company - GE

In 1876, Thomas Alva Edison opened a new laboratory in Menlo Park, New Jersey. Out of the laboratory came arguably the most famous invention of all-a practical incandescent electric lamp. By 1890, Edison had organized his various businesses into the "Edison General Electric Company."

General Electric Company - GE

General Electric 40W light bulb.

General Electric 40W light bulb.

"Charles Proteus Steinmetz, already a distinguished industrial scientist, was hard at work as GE's chief consulting engineer. After years of persuasion, Steinmetz convinced the GE leadership that the company would need a research laboratory to maintain its edge in lighting and electricity and also finding new areas to grow." - Heritage of Research

Charles Proteus Steinmetz

Charles Proteus Steinmetz He made ground-breaking discoveries in the understanding of hysteresis that enabled engineers to better design electric motors for use in industry.

Friday, August 01, 2014

Electronic Random Decision Maker

Running LED, Random Results, Decade Counter and Clock. Weigh the Pros-n-Cons, Take a Balanced Decision.

Electronic Random Decision Maker - Live Weblet

See Code gadgets-widgets. This can be built with one 555 timer and a CD4017. See Fun with LEDs but use the pin 5 to connect to a cap you charge with a pushbutton or gate like CD4093 to turn off 555 using pin 4 after a cap discharges. This may simulate a random.

Electronic Random Decision Maker xml code

Add only the iframe code to your Page or blog. The xml file works with google sites.

ScreenShot

Electronic Random Decision Maker