Thursday, July 05, 2018

Educational Function Generator Demo

This app from keuwlsoft puts a waveform on the audio output at 44.1 kHz and with a resolution of 16-bit. Two separate waveforms can be output to the left and right audio output channels respectively.

Dual channel function/waveform/signal generator for the speaker/headphone audio output. Educational use, for critical applications use a real calibrated function generator.

Educational Function Generator Demo

Educational Function Generator Demo

Output will depend on your device hardware. Some device hardware may may filter out the DC bias and low frequency signals. At high frequencies, the waveforms will be distorted due to limited number of samples for each waveform (for example at 4.41kHz, a sine waveform will be approximated by only 10 points).

Either sine, square or triangular waveforms can be selected with the 3 buttons on the left of this section.

This is a single screen app with two displays at the top showing the waveforms for channels 1 and 2 respectively. The output can be turned on with the blue button at the bottom right. The left and right audio outputs can be assigned to either channel 1 or 2 and turned on or off in this output box.

(This app has not been tested completely by me, looks interesting and useful for learning)

Tuesday, July 03, 2018

SpecScope from NFX Development

This is an interesting attempt in the right direction. The bandwidth may be only the audio range, but the first instruments with touch interface for tablets are being built for tablets even by DIY Enthusiasts.

SpecScope from NFX Development

SpecScope is a spectrum analyzer and is the second in the line of engineer applications from NFX Development. The SpecScope incorporates the speed and ease of use to access FFT frequency measurements in a hurry.

SpecScope Spectrum Analyzer

Some of the Features
  • Logarithmic/Linear measurements
  • Pinch to zoom in both X and Y axis
  • Selectable No. bin for accuracy versus speed
  • Three settings of spectrum averaging
  • Threshold trigger to hold the peak value
  • Tap to pause and resume measurements (graph is still navigational in this mode)
  • A adjustable sample rate allow analysis from 10 Hz to 22KHz

Monday, July 02, 2018

Learn Electronics with EveryCircuit

An Android App on which you can create a circuit, tap play and watch dynamic voltage, current, and charge animations.

Learn Electronics with EveryCircuit

Even when the live simulation is running you can tweak circuit parameters with an analog knob, and the circuit reacts in real time for your study and experimentation. Ohm's law, Kirchhoff's current and voltage laws, nonlinear semiconductor device equations, and more.

Learn Electronics with EveryCircuit


"Simplicity, innovation, and power, combined with mobility, make EveryCircuit a must-have companion for high school science and physics students, electrical engineering college students, breadboard and printed circuit board (PCB) enthusiasts, and ham radio hobbyists."

This app is related to Paul Falstad EE Applets and Tablet Apps

These are some educational java applets I wrote to help visualize various concepts in math, physics, and engineering. - Paul Falstad

Friday, June 08, 2018

Engineering Management Equations

Call it Quotes or Ideas or Instructions, these are thoughts that came from me from the past tech experiences of over twenty years.

Technologies should scale with Infrastructure. Buildings cannot stress the Foundations meant for. Traffic proportional to Road Width. Sync. Software should not overwhelm or Overload Hardware.

Raw Materials - Components - Finished Products. The Entire Processing and Design Chain has to improve, if the final Product has to Shine.

Management of Engineering and Technology

Value Engineering
In Engineering High Value products are those that are a combination of Precision Mechanical + Electrical + Analog + Embedded Microcontroller.

Tools Theory Practice
Excellent Tools alone are not enough, The Techniques & Methods have to be learnt, Then the Skills have to be acquired by Strenuous Practice.

Software 7S
The 7S - Software Should be - Simple, Stable, Spry, Slim, Scalable, Sensible, Scrimping.

Incremental Coding
I do incremental coding - code few lines, test, code again, test. Some extra code to interface for test inputs/outputs (virtual instrument). Incremental Coding, Modular. Test Points.

An Engineered Equation
( technologies + skills + processes ) X ( monitored + managed ) = engineering.

Keep Designs Simple
Circuit or Code - Keep it Simple, Modular, Reusable, Documented, Controlled, Compact, Clear, Creative, Maintainable, Testable, Tunable.

Wednesday, June 06, 2018

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

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 - delabs)

Philips - Tech Innovator and Inventor

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

In this page you will fine educative videos on questions like "What is human centric lighting?" and How and LED works. Also about how we can Control or Dim LED Lighting.

Tuesday, June 05, 2018

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. -  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

Friday, May 04, 2018

Digital Logic Probe Circuits

Digital Test and Measurement Starts with Logic Probe - Any point in a Digital Circuit can be High, Low, Float means TriState. The High Low in a 5V CMOS circuit is just 0V and 5V. In TTL and ECL it is much different.

The Test Point could also be Pulsing or have analog values and waveforms, as in Mixed Signal Chips. Here are Logic Probe Circuits you can Build in your own Home Lab.

Digital Logic Probe Circuits

Digital Logic Probe Circuits

Multi-Instrument Digital Assistant – PIC16F84A

Multi-Instrument Digital Assistant - PIC16F84A - "It contains four instruments in one unit: logic probe, single channel logic state analyzer, frequency counter and serial code receiver."

Small Electronic Testing Tools

Then first thing in Electrical testing is the Continuity Tester, Then we use the Neon Mains Screwdriver, Then we need an Voltmeter or an Ammeter. In electronics we need a OhmMeter and LCR meter too.

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