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Sensors / Detectors:  Flow

Sensors / Detectors -- Main Page

 

Last Updated: October 18, 2017 05:04 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

A Low-Cost 50MHz Frequency Meter -  it features an LCD readout, auto-ranging and two resolution modes.  And it can be run from a plugpack or battery operated.__ SiliconChip

Frequency comparator draws 8 mA -  03/03/97  EDN Design Ideas:  The circuit in Figure 1includes all the necessary components to build a simple, low-power frequency comparator.  The circuit centers around the operation of IC 1, which integrates an amplifier, a comparator, and a voltage reference. __ Circuit Design by Dalius Baranauskas, Semiconductor Physics Institute, Vilnius, Lithuania

Frequency comparator has status output -  12/26/02 EDN Design Ideas:  The original application for the circuit in Figure 1 was to check the number of revolutions of an engine with only one LED as an indicator.  The measurement of the number of revolutions usually involves sensors with a frequency output proportional to the number of revolutions.  The circuit compares the frequency output of such a sensor with a lower and upper limit and gives a visual result, usi __ Circuit Design by Susanne Nell, Breitenfurt, Austria

Frequency Comparer Produces Binary Result -  09/29/94 EDN Design Ideas:  instead of resorting to full-blown frequency counters, the simple circuit in Fig 1 uses four ICs  to rapidly compare the frequency of two pulse trains.  The circuit produces a binary 0 if f1 is greater than f2 and a binary 1 if f1 is less than f2.  The circuit exploits the fact that inevitably two consecutive leading edges of the higher frequency pulse train will follow each __ Circuit Design by Jay Kirschenbaum, Columbia University, New York, NY

Frequency Counter -  This is a circuit that uses IC NE555, five decade counters along with a 7-segment driver IC to form a 5 digit decimal counter.  The output of the decimal counter is used to drive the numerical display of frequency counter.   __ Designed by Electronics Projects for You

 

Frequency Counter -  This is the support  - Page for the simple frequency counter project in Homebrew, RadCom October 2006.  The original design used a gate time of one second which gives a count resolution of 1Hz.  Maximum input frequency is about 50MHz.  A VHF/UHF prescaler for this counter is described in Homebrew, RadCom February 2008.  U2 is a PIC 16F628 (PIC 16F628-20 or PIC 16F628A).  The PIC  crystal frequency is 10.240MHz.  The firmware is easily modified so that a 10MHz crystal can be used instead.  Homebrew for March 2008 shows how this counter can be used with a GPS or Loran controlled gate. __ Designed by EI9GQ homebrew radio

Frequency counter -  This project explain a very powerful frequency counter which has many useful software functions.  The software can add or subtract 3 different iF frequencies (±455 kHz , ±10.7 MHz and ±21.4 MHz).  You have also two level of resolutions, 1kHz and 100Hz __ Contact maxit91 @ hotmail.com

Frequency Counter -  Frequency counter with output on 7-segment display __ Contact maxit91 @ hotmail.com

Frequency counter based on PIC16F628 & LCD display -  This is the support  - Page for the simple frequency counter project in Homebrew, RadCom October 2006.  The original design used a gate time of one second which gives a count resolution of 1Hz.  Maximum input frequency is about 50MHz.  A VHF/UHF prescaler for this counter is described in Homebrew, RadCom February 2008.  U2 is a PIC 16F628 (PIC 16F628-20 or PIC 16F628A).  The PIC  crystal frequency is 10.240MHz.  The firmware is easily modified so that a 10MHz crystal can be used instead.  Homebrew for March 2008 shows how this counter can be used with a GPS or Loran controlled gate. __ Designed by EI9GQ homebrew radio

Frequency Window Comparator has hysteresis -  11/07/96 EDN Design Ideas:  The frequency comparator in Figure 1 uses two VCOs.  C1, R1+R2, and the voltage at pin 9 determine the frequency of IC 1 (900 Hz].  C3, R5+R6, and the voltage at pin 9 determine the frequency of IC 2 (1580 Hz].  if fiN is lower than 900 Hz, then the output P2 of phase-comparator 2 in IC 1 is high and drives __ Circuit Design by W Dijkstra, Consultant, Waalre, The Netherlands

Low-Cost 50MHz Frequency Meter -  it features an LCD readout, auto-ranging and two resolution modes.  And it can be run from a plugpack or battery operated.__ SiliconChip

Low-Cost 50MHz Frequency Meter; Mk.2 -  This update of our very popular compact 50MHz Frequency Meter now has an internal battery pack or can run from a DC plugpack supply.  it also incorporates a 10kHz rounding mode to enable 36MHz R/C transmitters using pulse position modulation (PPM) to be measured with an unambiguous reading.__ SiliconChip

Panel Frequency Meter -  Here’s a simple panel frequency meter to measure the frequency of 230V AC mains.  When you connect it to the 230V AC line, the display shows the line frequency.  Generally, the...__ Electronics Projects for You

Simple Circuit Frequency Counter -  This is the support  - Page for the simple frequency counter project in Homebrew, RadCom October 2006.  The original design used a gate time of one second which gives a count resolution of 1Hz.  Maximum input frequency is about 50MHz.  A VHF/UHF prescaler for this counter is described in Homebrew, RadCom February 2008.  U2 is a PIC 16F628 (PIC 16F628-20 or PIC 16F628A).  The PIC  crystal frequency is 10.240MHz.  The firmware is easily modified so that a 10MHz crystal can be used instead.  Homebrew for March 2008 shows how this counter can be used with a GPS or Loran controlled gate. __ Designed by EI9GQ homebrew radio

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Frequency Sensors / Detectors / Monitors

 


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