12$ 30MHz signal generator using Arduino

A signal generator is an electronic device that generates electronic signals and waveforms. These electronic signals are either repeating or non-repeating as per the requirements and field of applications. It is generally used in designing, testing, troubleshooting and repairing electronic devices. A signal generator can generate various kinds of waveforms. Most common are the sine wave, square wave, sawtooth wave and triangular wave.

12$ 30MHz signal generator using Arduino

This instructable shows a full guide on how to make a 30 MHz signal generator for 12$, using an Arduino and an AD9850 DDS synthesizer module. The circuit is pretty simple and small enough to fit in your pocket. Kedar Nimbalkar, the author of the instructable, says:

A precession signal generator is very easy and affordable to make using an Arduino and DDS synthesizer (ad9850) . It’s World’s first smallest portable signal generator.

You can make decent 0 -30 MHZ frequency Signal generator only in 12$ .

Parts List:

1. Arduino Pro mini
2.AD9850 (DDS Synthesizer)
3.16×2 LCD Display ( Hitachi HD 44780 )
4.Rotary Encoder
5. CP2102 (or any USB to serial converter)

I think you are familiar with all of the above items except the AD9850 (DDS Synthesizer). First of all, you need to know what does DDS stand for.

Direct digital synthesizer (DDS) is a type of frequency synthesizer used for creating arbitrary waveforms from a single, fixed-frequency reference clock. A basic Direct Digital Synthesizer consists of a frequency reference, a numerically controlled oscillator (NCO) and a digital-to-analog converter (DAC).

AD9850 (DDS Synthesizer):

The AD9850 is a highly integrated device that uses advanced DDS technology coupled with an internal high-speed, high-performance D/A converter and comparator to form a digitally programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9850 generates a spectrally pure, analog output sine wave. In a nutshell, AD9850 works on DDS (direct digital synthesis ) which can generate analog waveforms with digital input.

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