ESP8266 Community Forum

- Fri Jun 28, 2019 3:39 am #82942

As I wrote - maybe it's not LF noise problem - your 1G capacitor didn't work as an filter in HF noise, but only in LF...

I'm sorry, probably I'm too ignorant on the matter, how can I use the capacitor as HF filter instead of LF?

- Fri Jun 28, 2019 4:11 am #82943 Brief description is for example here: https://en.wikipedia.org/wiki/Filter_capacitor - "Power rail filtering" section...

- Fri Jun 28, 2019 4:36 am #82944

Brief description is for example here: https://en.wikipedia.org/wiki/Filter_capacitor - "Power rail filtering" section...

thanks for the kind answer.
can you give me an example on how to connect the capacitor please?

- Fri Jun 28, 2019 4:48 am #82946 Better way is to search the web for reasons, why and how to use power filtering with different capacitor types and sizes. At least you have to read this https://www.edn.com/design/analog/43135 ... erformance - it is valid not for just PLL circuit (ESP8266 contains some PLL's too). Or you can try, what I've suggested - just connect small ceramic capacitor in parallel with your huge 1000uF one...