EG8010 frequency Accuracy

Author	Message
oreo Senior Member Joined: 11/12/2020 Location: Canada Posts: 112	Posted: 04:35am 26 Jan 2025       Thanks for the suggestions and comments.   noneyabussiness said   or spend 10 bucks on a battery clock... no more timing issues with mains... True, and I suppose I could ignore the microwave clock, but the coffee maker makes coffee 5 minutes earlier every day! As Mike suggested, I set up another one of these EGS002 boards on the bench, and found that the crystal (according to my scope) was running at 16.0006mHz.  As Mike99 suggested, by adding 10pf (my smallest available capacitor) in parallel to both legs of the crystal, brought it down to 15.9998mHz.   I removed these 2 caps and measured the 8010 output frequency, by capturing the waveform and measuring the period (storage scope).  I measured 60.21376Hz. I then changed the frequency of the module to 50 hz and repeated the process and measured 50.02Hz. I can't believe it, but it appears there is a problem with the EG8010 coding when using 60Hz. If my measurements are correct, I need a 11.958Mhz crystal or crystal oscillator.