To test the FFT in the light music project, I needed an audio frequency generator. I liked the features of AD9833 and I decided to share the project. It allows you to synthesize frequencies from 0.1 hertz to 2.5 MHz, which is more than enough for my work. It is possible to select the discreteness of changing the frequency step from 0.1 hertz to 999 hertz. It is also possible to enter frequency values in kilohertz, which speeds up the efficiency of setting a new frequency. The level of the output signal is regulated, as well as the possibility of obtaining a meander (two types). All specified parameters are stored in the EEPROM of the microcontroller, which is convenient for subsequent use, when the power is turned off. The hint, help in work, in three languages, English, Ukrainian, and Russian is built in. The control of the Synthesizer is frequent, carried out through the encoder, which is quite convenient.