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

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