They aren't vias.. it's a single sided board.Could be vias. Are there similar 'pads' on the underside of the board?
Do you mean the board!! it's a AC unit motherboard.Hello there
What does It do?
There are two possible explanation, which are not incompatible with each other.i speculate it may be alternating impedance trace for some sort of RFI EMI block . . . but i cannot find anything such from www
the idea behind could be that the impedance change in transmission line creates a reflection . . . just perhaps = don't trust me on this particular one
. . . it also might be - say - ?? for the thermal balancing ??
I suspected the same but I wasn't sure about it ....I didn't even know what to type in the search bar lol.i speculate it may be alternating impedance trace for some sort of RFI EMI block . . . but i cannot find anything such from www
the idea behind could be that the impedance change in transmission line creates a reflection . . . just perhaps = don't trust me on this particular one
. . . it also might be - say - ?? for the thermal balancing ??
So these things are called solder mountains!?There are two possible explanation, which are not incompatible with each other.
I tend to doubt the impedance discontinuity approach as the description "AC motherboard" implies power line frequencies rather than RF (aka Nervous DC).
- The solder mountains add significant mass to the thin copper trace
- There is a not insignificant increase in surface area
I don't know if solder mountains is a universally accepted name - it's just what I call them.So these things are called solder mountains!?
What's the advantage of adding mass to track?is it to allow for more current!
I didn't get your second point
Was calling them "solder mountains" just a lucky guess?I used "solder mountains" in single sided PCB in power supplies. Years ago single sided was lower cost and thin copper is low cost. In the high current traces we removed the solder mask and built up solder. I know the solder is high resistance compared to Cu but the copper is very very thin and the solder mounds are very thick. Also the solder increases the surface area for heat. On the forum we argue if it works. Either way it is/was common practice on single sided boards.
Yes, likely a type of 'getter'.The solder bumps increase corrosion resistance where temperature and humidity are known to fatigue the track form pockets.
by Duane Benson
by Jake Hertz
by Jake Hertz
by Jake Hertz