It is standard practice that to eliminate any source of noise the decoupling has to be as near the source as possible using capacitors suitable for the frequency/ies involved.
This also aids stability.
Shielding of the readout and its wiring will also help.
Using shielded cables including in the audio stages is also standard practice.
On Sun, Feb 19, 2017 at 3:30 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I don't think I could put up with the freq jumping around like that, should have a bit of hysterisis in raduino code.? So you have to reverse direction 2 or 3 clicks before anything happens.? Somebody in a recent post found that putting the supplied 0.1uf cap on the raduino pins instead of at the tuning pot on the other end of the wires made it behave somewhat better.? I might eventually go to the shuttle tuning scheme described by Don Cantrell here: ?
On Sat, Feb 18, 2017 at 06:07 pm, John Smith wrote:
Mine did this too. When the frequency readout is flicking back and forth there is a corresponding click. When the readout is not flicking a quieter clicking sound can still be heard until I keep fiddling with the knob to get the freq steady, then it's all quiet. It's like the clock generator is changing frequency in small enough amounts that it doesn't change the display. But then after changing the tuning poteniometer for a smaller one with a knurled shaft, it doesn't do that anymore. The freq still flicks back and forth like it did before, but no more quiet clicking. I just did this for a more convenient knob choice.? I also noticed before, that when it does that quiet clicking, my transmitted signal would also waver back and forth in freq while I monitored with a receiver.
