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Tuesday, October 24, 2017

Product Design Precautions

When you design a new Product or Engineer an existing one; communications and documentation is important. Creating a satisfying solution is the main thing. If requirements and specs or not properly developed it can lead to blame-games, wasted time and spoils the reputation.

A firm also should do proper market study before the decision to design a product. Even a well designed product cannot be sold if it does not offer a cost-effective solution.

Black Box Specifications

Product Design Precautions
  • Start Projekt {
  • Customer Interaction and Communication to make a specs sheet and drawing.
  • Block Diagram, feasibility, cost, risk, samples demo and study similar ideas.
  • Effective designs are cost effective within customer budget, draft BOM costing.
  • Circuit and Code design and get more inputs from customer and then freeze specs.
  • Build Dummy for ergonomics and discuss, Prototype and start test at site or simulate.
  • Calibration and testing and production documentation drafts final costs.
  • Pilot Production of a small batch, rigorous test batch, and freeze production documents.
  • Documents and Prototypes to be given to Production Engineering.
  • Production Engineering continue engineering maintenance and quality issues.
  • } End Projekt

    GoTo Next Projekt
(I had written this in Aug-05, it is my 90s experience, it may indicate some useful points - delabs)

Wednesday, October 18, 2017

Historical Electricity Teaching Instruments

In February 1975, Deborah Jean Warner, a Curator of Physical Science at the National Museum of American History, called me to ask if Kenyon had any historical physics teaching apparatus. I looked around my office.......

Thomas B. Greenslade, Jr. - Professor Emeritus of Physics - Kenyon College, Gambier, Ohio

Historical Electricity Teaching Instruments

Electrical Measurements, Electric Motors, Electricity, Static Electricity.

Historical Electricity Teaching Instruments

Physics apparatus often goes by various names. The interrupter, the electrotome and the repeater are all the same instrument. Some apparatus has a person's name attached to it: Matteucci's apparatus or Wheatstone's bridge. Other apparatus isn't used any more: Packard's apparatus or the piezeometer.

Monday, October 02, 2017

Multi Zone Process Controller

This was one unique custom design made. It was Multi Zone Scanner controller. The Instrument had a Analog Multiplexer with a Synchronous Sample and hold, as the analog value was transient.

Multi Zone Process Controller

It had four relays that would turn off or on every scan cycle, depending on the input values. The system was slow it had inertia, so it did not require a fast acquisition for 'Real time' as you may find necessary in small Thermal Systems.

This was built with analog and digital chips, no uC in this design. This was because it was a front end controller, there was a risk of a uC system getting stuck. These days, that problem may not be so worrisome, but i am not so sure.

What if the watchdog goes for a short nap?

You can find part of the designs here - Industrial Process Control Circuits