Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings

How Strain Gages Using Printed Sensor Paste Sensor Have Given Birth to New and Improved Pianos

By Jens Kautzor, CEO Hoffmann + Krippner | August 16, 2016

Share

Pianists and other professional musicians that play piano have a problem. When they are traveling or are doing a concert on the road, using a full size piano is a major challenge. Transportation costs can be hefty. Renting a locally sourced piano for the performance can also be expensive plus they may need to do a great deal of tuning to get the sound right. In addition, using a piano that they are not familiar with can put a crimp into their performance.

The typical option is an electric piano. Electric pianos are more compact and are much easier to ship and set up. However, many pianists don’t like playing an electric piano because the keys, and the way they respond to touch, do not feel like a regular piano. They don’t get the tone and volume control they expect.

The piano manufacturer Mario Aiwasian, Founder of Alpha Pianos GmbH, has solved that problem by using a patented sensor technology developed by Hoffmann + Krippner that essentially replaces the long strings inside a piano with electronic strain gage sensors. A pianist playing what that manufacturer calls an “e-piano” will note that the keys still look and feel the same as a regular acoustic piano.  However, the felt hammers do not strike the usual two or three strings, but instead strike pressure sensors.

This technology was especially developed for the Alpha. Decisive for the playing feel because these sensors essentially behave like piano strings but without the maintenance and tuning problems incurred by strings. With the aid of these sensors, the keystroke force and the resistance at the point of attack are detected. Also, as on a traditional grand piano, the force of the hammer head strike determines the volume.

The big advantage of a strain gage versus most other sensor technologies is that the strain gage is variable. The harder the key hits the gage surface, the bigger the electrical signal that is transmitted to the instrument’s audio processor brain which converts the various current levels to the appropriate notes. Just like with a regular acoustic piano, the harder the piano key is hit, the larger the electrical signal, and the louder the note.

Instead of strings one would normally find in a piano, the Hoffmann Krippner P-DMS strain gage is set up directly above the felt hammer heads. The keys hit the gages, instead of strings.

In addition to the advantage of being more compact and easier to ship, these new e-pianos from Alpha Pianos GmbH don’t face the constant problems with tuning that string based pianos do. No matter the temperature, no matter the humidity – no matter how roughly the piano was bounced around during shipping, the sound of the individual keys stays the same.

What makes this new Hoffmann + Krippner  strain gage technology even more compelling is that it can be used in a wide spectrum of audio and electronic equipment, not just keyboards.  The strain gage’s exceptional sensitivity, makes it perfect for applications like electronic drum pads, electric guitars, special effect boxes, DJ consoles, audio mixing suites, etc.  

Image credit: Hoffman + Krippner

Hoffmann + Krippner is one of the industry leader for developing sensor paste technology that can be printed onto a PCB board. Their patented sensor paste technology printed onto a PCB board is a unique conductive material that is sensitive to slight pressures. By pushing on it, a small deformation to the paste can create a change of its electrical resistance that generates an analog signal that can be analyzed to provide input and control for a wide range of musical as well as non-musical applications. 

As the strain gage can be directly printed on the application’s PCB board – the P-DMS “tongue” – each individual gage. It does not need to be connected by wires. Instead of requiring wires and connectors, the processor and other electronic components can be directly mounted on the PCB board, making the entire device space-saving.


Filed Under: Rapid prototyping

 

Related Articles Read More >

PCB mills
Basics of printed circuit board milling machines
Rapid Product Solutions, Inc. enhances its rapid prototyping and production services
Protolabs Launches Production Capabilities for Metal 3D Printing
3D Printer Makes Peacekeeping Missions Cheaper and Repair of Defense Systems Faster

DESIGN GUIDE LIBRARY

“motion

Enews Sign Up

Motion Control Classroom

Design World Digital Edition

cover

Browse the most current issue of Design World and back issues in an easy to use high quality format. Clip, share and download with the leading design engineering magazine today.

EDABoard the Forum for Electronics

Top global problem solving EE forum covering Microcontrollers, DSP, Networking, Analog and Digital Design, RF, Power Electronics, PCB Routing and much more

EDABoard: Forum for electronics

Sponsored Content

  • Global supply needs drive increased manufacturing footprint development
  • How to Increase Rotational Capacity for a Retaining Ring
  • Cordis high resolution electronic proportional pressure controls
  • WAGO’s custom designed interface wiring system making industrial applications easier
  • 10 Reasons to Specify Valve Manifolds
  • Case study: How a 3D-printed tool saved thousands of hours and dollars

Design World Podcasts

May 17, 2022
Another view on additive and the aerospace industry
See More >
Engineering Exchange

The Engineering Exchange is a global educational networking community for engineers.

Connect, share, and learn today »

Design World
  • Advertising
  • About us
  • Contact
  • Manage your Design World Subscription
  • Subscribe
  • Design World Digital Network
  • Engineering White Papers
  • LEAP AWARDS

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings