Arduino IDE About this project Software-defined radio SDR is a radio communication system where components that have been traditionally implemented in hardware e. In the following video I present one such radio. At the input we start with a potentiometer of 1 k ohm, it is the RF attenuator. The next circuit is the preselector, switchable to the ranges MHz and MHz. Tuning of the preselector is done with a potentiometer.
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The AD is a chip that can produce a sinusoidal wave from about 1hz to 40mhz. Without going into too much detail you are required to send a set of serial or parallel data to the chip to set the frequency. However it has been hard to find a good AD Pinout so here you go. For me, the easiest way to manage the AD is with an Arduino Uno. I have been playing with the Arduino for only a couple of months and I already have found it to be a fantastic development platform.
A little quick work with a protoboard and I have a nice working VFO. You can watch my video on YouTube showing how it works. I also have another video of the VFO attached to my oscilloscope. This project is ongoing. You should be able to deduce the pin outs on all items from the Arduino Sketch but if you have questions just contact me. My schematic is a little rough as I do not tend to create them that often so let me know if you catch anything out-of-place!
Because of a lot of requests I have also created a version for IF superhet type receivers. The IF can be anything you wish and can be additive or subtractive. The code is well documented and for those of you who modified my original sketch it should be easy enough to adapt as you see fit. If you build something from my design please send me a picture or a video of your creation.
I love to see what others do! Or you can also send a donation via paypal to rvisokey yahoo. I will need some kind of amp to bump up the output to 4v ptp, manual calls for 12v on 15 meter band for some reason. Anyhow I like what you have here and let me know what you think.
It is based on AD chip and is very easy to operate. This generator has 78L05 voltage regulate. Input current at MA, input voltage V would be the ideal voltage. Input voltage of 12V can only be used for short time testing, otherwise will cause heat to board. If powered by main board, DDS does not need independent power supply. DT is signal from main board.
Arduino + AD9850 Frequency Generator
I have seen several versions, differing in the PCB layout or in the size of the oscillator. Mine has the small oscillator. The User Interface A 16 character x 2 row LCD display shows the current frequency and the crystal oscillator selected. Stopping for more than 5 seconds during editing exits edit mode, leaving the configuration as it was.
DDS Signal Generator AD9850 6 Bands 0~55MHz Digital Shortwave Radio
The AD is a chip that can produce a sinusoidal wave from about 1hz to 40mhz. Without going into too much detail you are required to send a set of serial or parallel data to the chip to set the frequency. However it has been hard to find a good AD Pinout so here you go. For me, the easiest way to manage the AD is with an Arduino Uno.