Monday, October 08, 2018

Drawing Tools for Electronic Schematics in Android

Here are some Circuit Diagram Drawing Tools for Android Tablets, they may be still under development. It may be Interesting to explore and try out.

Schematic Demo is an easy-to-handle and comfortable CAD-software, developed for different kinds of diagrams.

Schematic Demo Dmitry Ustimov

Editing objects performed by interaction with a device touch screen. You can create and edit such graphic objects as: - Point, Line, Polyline, Bezier curve, Arc, Ellipse and Rectangle.

Schematic Demo Dmitry Ustimov

Electronic schematic drawing application for Android by Harry Konstas
palmDraft lite ElectronicsCAD

palmDraft lite ElectronicsCAD

This is a bitmap-based CAD, featuring a high definition, flick-panning, pinch-zoom-able working canvas optimized for finger and pen drawing. It's as easy to manipulate as a sheet of paper. The schematics file format is standard .PNG bitmap file format which can be easily exported and shared for printing.

MCU simulator for Android OS

The MCU simulator for Android OS runs Assembly language code similar to the 68705 MCU on a simulated on-screen prototype board. Great for embedded applications hobbyists, students, teachers or anyone who likes to experiment with electronic Micro-controller prototype boards. It's fun for learning assembly language too!

Wednesday, October 03, 2018

Reliable Robust Electronic Products

Use a Servo Stabilizer or CVT Constant Voltage Transformer or at least an Isolation Transformer. The First Defense form HV Surges, Spikes.

High Voltage Polyester & Polypropylene Metallized Capacitors in Stepdown Supplies should be Fire Retardant & Self Healing with a MOV too.

EE Design Library - Electronic Product Design Resource

Tropicalized means immunity or resistance of an equipment in conditions of varied Temperature, RH, Insects, Fungus, Brine, small life form.

Reliable Robust Electronic Products

Reliability by Simplicity

Vital controls should be Simple Electromechanical. Supervisory and Fine Automatic controls are in Embedded Computing. Mechanical Overrides!  

<< More Reliable - Mechanical, Electrical, Analog, Digital, Embedded System (Firmware), Computing System (OS+Software) - Less Reliable >>  

For a given quality level, more the components or parameters, may reduce reliability. Simpler the solution, more reliable it could be. 

Electronic Product Design is not only about Aesthetics and Affordable Price, but also Reliability, Safety, Longevity & Maintainability.

A Product's Life

If a product gives three years life with minimum service support it can save itself from building a bad reputation. six years will establish the brand on a long term basis, twelve years of product life you will have the user of the product selling for you.

Connectors and Interconnects

"Never Mix Electrical and Mechanical Connections" (probably from tektronix) this is a rule, more so for power connectors. Strain relief prevents mechanical stress from reaching the connector joints/spring metal. The wire terminations are also cushioned by strain relief.

The PCB and Product Engineering should ensure that the mechanical stress or load is not a job/function/role of the connector. At higher currents a small contact resistance can generate a lot of heat, worsening the contact further, similar to thermal runaway of Power Transistors.

delabs- 1999 - updated 2002 - 2010

Monday, October 01, 2018

Ostermiller Basic and Scientific Calculator

Scientific Expression or Formula Calculations. Twenty Transaction Memory and Tape, Different bases like Decimal and Octal, Logic Math, Functions, Constants.

Ostermiller Basic and Scientific Calculator

Deriving knowledge and inspiration from ostermiller.org. The GUI and Skin Modifications were done. This Scientific Calculator was ported to iGoogle with a new UI by delabs.

Screenshot

Scientific Calculator

Source Code - delabs-dapj - scientific-calculator

It has Brackets to build your own math equation. Scientific Functions like Trigonometric, Hyperbolic, Logarithmic.Memory (cookies), A Paper Trail or Tape for Equation and Result History.

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