rev F cap mod against hall digital noise [focus on C3 the one shared with VR][two modded boards in PR]

[rusefillc]

How do we hand modify add caps for hall digital noise drama?

https://github.com/rusefi/alphax-4chan/issues/72

pins C3 and C7

actually it's mostly C3 which has issue. Is it same VR cap or different cap to improve mostly C3 digital hall input?

[ElDominio]

Question, does changing to E5 help at all? @andreika-git ?

[rusefillc]

Question: is there a difference between C3 and C7?

[Qwerty-OFF]

C7 is traditional OpAmp input through Input module C3 connected to VR discrete and Schmitt trigger Try to add 2x 1n capacitor: And remove this:

edit:

[rusefillc]

@timbelom please attempt two above mentioned mods on 4 chan rev E we have

• add two 0805 cap marked 1n
• remove resistor as described

https://user-images.githubusercontent.com/4116383/220756528-d098cc09-c10a-4265-8b81-b85b441e3b2b.png

[rusefillc]

@Qwerty-OFF посоветуй плиз куда кидать на землю конденсатор рядом с R22 тоже картинкой?

[Qwerty-OFF]

Лучше использовать SMD

[rusefillc]

@Qwerty-OFF my bad we have rev F not rev E, need same instructions for rev F with latest VR

[rusefillc]

@Qwerty-OFF rev C does not have D57 is there a chance to fix rev C?

overall at the moment we have rev F and rev C to modify

[rusefillc]

1nf

[rusefillc]

1nf

[rusefillc]

Actually @Qwerty-OFF says to remove R753_2 to disconnect VR just for a test

[rusefillc]

@ElDominio this board is on the way to you. Please test and share results :)

[rusefillc]

@Qwerty-OFF we have positive test results! we need this mod on rev G

https://github.com/rusefi/rusefi/issues/5211#issuecomment-1493075254

[Qwerty-OFF]

[rusefillc]

https://github.com/rusefi/alphax-4chan/issues/117

[rusefillc]

new ticket spelling our requirements https://github.com/andreika-git/hellen-one/issues/285