Needless to say this chip can be used for a number of different applications, the most common being in the field of remote controls, and security systems. Pin 3 is the sensing input of the input, which is used for detecting a given phase-locked loop frequency, in other words this pin will lock-on with the matching center frequency which may be set inside the IC through a pair of external RC network. The Pin 5 and 6 are used for creating the center frequency by setting up the values of R1, C1 as required, and this frequency is used by the sensing input pin 3 to lock-in and create a logic zero at pin 8 which is the output pin of the IC. Output Pin 8 is normally logic high and becomes logic zero as soon as a matching frequency is detected at pin 3 of the IC.
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This decoder detects automatically the right tone and speed of the received CW signal. There is also a programmable noise- filter. Of course, there must be an acceptable Signal to Noise ratio of the received signal. Only the most necessary parts are used to make it work like a real Aduino micro controller.
This IC is a electronic 10Kohm potentiometer, which digitally can move the resistance value up and down in steps, controlled by the Arduino software. On the double sided PCB we find all the control buttons and a reset- button.
Further more the audio entry, headphone entry and loudspeaker connections. All controls and connections are also via Pin- headers available on the PCB, so you can easily use external controls. In this design, we again make use of the already known Arduino LCD display 20x4. But now we make use of a parallel connection.
On board are controls to set the Backlight. This design easily can be used without the need of a enclosure or extra parts. Building this project gives you no problems if you read the instructions carefully. Its sends than the right stored macro. Only a few parts make it act like a real Arduino microcontroller. On the topside of the double- sided PCB is a silkscreen, so its easy to know where to put all the parts.
Connections for a Iambic Keyer and Loudspeaker are made by connection blocks. This design is made for using a Iambic Keyer. Its possible to use a straight key, but in practice this is not handy. The central placed function- switch is doing the job! Its a very unique design Practical experiences I, myself are not a fanatic CW user. Therefore, this Arduino Based CW designs, are very helpful for me.
Perhaps also for you? Expanding the possibilities In the meantime this project has been modified several times. You can now choose specific parts of the frequency spectrum and measurements can now be up to 70 Mhz. So the 6 meterband is now included. Also the presentation of the results are changed.
LM567 National Semiconductor, LM567 Datasheet
LM567 tone decoder faulty?