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Old 2nd May 2019, 8:52 pm   #10
roberthewitt
Retired Dormant Member
 
Join Date: Feb 2010
Location: Hull, East Riding of Yorkshire, UK.
Posts: 25
Default Re: Arduino based DDS with 898 Eddystone dial

Thanks to all for input . I endorse the comments about the "silky flywheel tuning" and will stick with manual tuning. Using a simple pot as voltage divider a 0 -5v swing gives input values of 0 -1023 to the Arduino . The pot can be tuned through 180 deg in parallel with the main shaft which" tunes" the encoder. The position of the pot wiper (ie between 0 -1023) would then always indicate the position of the dial even after switch off/on.
Not sure if 200(khz bandspread) / 1023 increments will be acurate enough though (200hz /increment) ??

Can anyone recommend a source for single turn precision pot around 1 - 5k ohms rather than just using a bog standard pot ?
Robert
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