07-02-2019, 10:12 PM
(07-02-2019, 05:39 PM)BusyBee Wrote: An interesting little project which I will look into.
Hi Tracy,
glad you like the project. The frequencies can be set to a precision of 1Hz. In terms of stability they are tied to the frequency of the crystal on the DDS board which seems to be quite good. I have been running one of these in an AM Stereo transmitter for about a year now and it has not drifted. This is the board I used this design.
I also have another project with an AD9850 DDS board that is far more sophisticated as it can tune any frequency from 100kHz to 20MHz with variable step size, tuning is va a rotary encoder. It has a display that shows frequency, step size and "station memory #". There are 8 non volatile memories that can be used to save frequencies. The whole circuit runs on two 18650 Li-Ion batteries for about 10h and is thus portable. This project is not quite finished yet and needs some finishing touches. Once I have completed it I will post it here.
Semir
