Sergei Bezrukov writes:
My goal was to design a simple and user-friendly frequency counter which would be capable to handle radio FM frequencies and have an autonomous power supply. Powering it from batteries benefits to the device portability and makes working with it more convenient by eliminating a mess of power cords in a home lab. I use it just occasionally and a small size is a bonus simplifying its storage in a table drawer.
Most of similar devices I have found on the Internet use an LCD module with a built-in controller. Such a device draws pretty much current. Also, many high-speed counters use power-hungry ICs which makes it difficult for a battery operation. Finally, many projects are poorly documented which makes any modification unnecessary difficult. So, I started my own design which uses modern high speed and low-power ICs and can work from a single AA cell.
150MHz PIC Frequency Counter - [Link]
Fast Frequency Counter - [Link]
This is 60 MHz frequency meter / counter for measuring frequency from 10 Hz to 60 MHz with 10 Hz resolution.It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. The meter provides very stable readings and has excellent input sensitivity thanks to on board amplifier and TTL converter, so it can even measure weak signals from crystal oscillators. With the addition of prescaller it is possible to measure the frequency of 1GHz and above.
60 Mhz Frequency Meter / counter - [Link]
Very often when designing some stuff I need a square wave signal generator with variable pulse width and frequency to control power MOSFETS.
You can use such a tool when designing DC-DC converter or switch-mode power supply, you can use it to emulate PWM from microcontroller when developing some new embedded design, or maybe you want to design your own wireless charger… This is only some of the things you can use it for.
PWM Generator Project - [Link]
A long time ago I built a radio using a Philips UV616/6456 TV tuner that is capable of receiving radio signals over a large range of frequencies. It ranges from 47MHz up to 860Mhz which gives me the possibility of decoding either Over-the-Air or Cable TV signals.
The problem is that the radio doesn’t have a frequency display, so tuning a particular frequency is always a challenge.
This project is about building a frequency counter, using a 2×16 LCD and a small PIC 18F1320 micro-controller.
VHF/UHF Basic Frequency Counter - [Link]
Here is my new Frequency meter who was done with a LCD’s cellular phone!!! This is a simple project. The Frequency is passing through an op-amp to convert it in a square wave. The ouput of the op-amp is feeding the 3*8 bits counter (24 bits) who can accumulate at a maximum of 16777216 count.
Frequency Meter – [Link]
To show that iPhone is not just a fashion accessory, as many like to say, read below how to make it a useful device. It is a frequency generator with solid characteristics. Quality will satisfy the needs of amateur electronics and it will be sufficient for the basic measurements and adjustments in audio technology.
iPhone as a frequency generator – [Link]
Embedded-Lab.com has just posted a new project called “Multi-function power supply”. It is not just a simple power supply but it has built-in Volt-, Current-, and Frequency meters. The beauty of this project is that while you are prototyping your circuit, you can continuously monitor how much current your circuit draws at a specified operating voltage. This way you will know in advance how much power your design will require. The built-in frequency counter can measure frequencies up to 50.0 MHz.
DIY Multi-function power supply unit – [Link]
This project (posted on hobbydebraj) describes a simple spectrum analyzer based on a dsPIC30F4011 microcontroller. It uses Microchip’s FFT library codes to calculate the frequency spectrum of an input signal. The signal conditioning is achieved by a TL084 Op-amp IC. The peaks of spectrum are displayed on a graphics LCD. [via]
A simple spectrum analyzer using dsPIC30F4011 – [Link]
This Frequency Counter:
(a) works well into the RF range (I tested it to 50MHz and it was solid, unlike some of the posts here which stop working at a few hundred kHz)
(b) is extremely cheap (around $10),
(c) is portable, battery powered, and hand-held, and
(d) uses common components that are stocked at mouser.com so anyone build one! It’s based around an ATMega16 microcontroller reading frequency from a 74lv8154 dual 16-bit counter (acting as a 32 bit counter) and displays frequency on two multiplexed 3 character 7-segment displays.
$10 Frequency Counter – [Link]