Low-frequency-tachometer

  
This tachometer lets you measure heartbeats, respiratory rates, and other low-frequency events that recur at intervals of 0.33 to 40.96 seconds. The circuit senses the period offm, computes the equivalent pulses per minute, and updates the LCD accordingly. Although the decimal readout equals 60 fm, the circuit doesn`t actually produce a frequency of 60 fm.
Low-frequency-tachometer - schematic

The computation involves counting and comparison techniques and takes 0. 33 seconds. The circuit is posted by Ricardo Jimenez at EDN magazine -Design Ideas.




Recommended videos


  • Digital Counter with proximity sensor
    Duration: 2:57.
  • Works Connection-Hour / Tach Meter Install
    Duration: 6:03.
  • How to fix tachometer error dashboard Toyota Corolla. Years 1995-2005.
    Duration: 7:33.

News


  • Brandon Sun
    Brandon Sun "But when I started to work with Germain Malepart, she taught me to play scales in every key, every mode, every , contrary motion … I certainly knew my scales at the end of my three years of studying, but I still don't favo
     3 August 2016
  • Control Design
    Control Design “After the NTM proved to be successful, I needed to get back to the digital panel market, but I couldn't find an LED to satisfy my needs,” he says. “I went to China and worked with them to design a custom dis
     10 April 2015
  • The Borneo Post
    The Borneo Post Among the tampering methods discovered by the team was the usage of a remote switching relay with a receiver circuit board to bypass the which will then disrupt the full flow of electricity to the meter and will only register
     2 December 2014
  • Herald.ie
    a cheap way of fiddling water could land people in jail, Irish Water has said. Groups opposed to the water charge have been encouraging people to replace the with a plastic plug that can be bought for as little as €2. The plugs
     29 July 2014
  • gulfnews.com
    gulfnews.com Sharjah: Sharjah Transport has started penalising taxi drivers who swindle passengers by tampering with taxi . The move came after the taxi company received complaints that taxi drivers were illegally charging additional amou
     7 April 2012
  • Popular Science
    Popular Science Electric Wheels (Top View). A top view of the gears driving the counter wheels. Revolutions of the shaft on which the big aluminum wheel rides turn the gold colored shaft in this picture, which in turn drives all of the count
     14 October 2009

.