I suffered badly from tuning clicks in a home built DDS.
The only way I could cure it was to provide a very well filtered power supply to the DDS power circuit.
A choke in the + rail and a nice large filter cap (as well as a low cap to suppress the higher freqs)
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Software may have some influence, but it is being induced into the hardware and a hardware fix is ultimately required.
Darryl
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On 2017-03-31 10:02 AM, Allard PE1NWL wrote:
The clicks seem to be also related to the si5351 library version.
With v2.0.1 no clicks. With v2.0.2 and v2.03 I have quite strong clicks. So it is somehow S/W related.
I'm quite sure the noise is not coming from the LCD display. As a test I disconnected the LCD board but the clicks were equally strong.
The clicks are equally loud even when I turn the volume to minimum. This suggests that the click-noise is coming in straight to the LM384.
I then replaced the wires to/from the volume pot by shielded cable, this really helped a lot. Clicks are now almost gone (but not completely unfortunately).
73, Allard PE1NWL
