Hi
?
You¡¯re looking at the top of the PCB
?
The holes the BS170 leads go into are actually little plated pipes electrically linking the top and bottom of the PCB even before you solder?
?
You solder on the other side and concentrate on making a good joint there?
?
Depending on heat time etc as you solder the inverted board the solder will run ¡®down¡¯ through the ¡®pipe¡¯ beside the lead to mostly fill or even slightly over fill the hole on the other side, ?
?
That¡¯s what you¡¯re seeing. ? All the joints in the photos are fine?
Bruce Akhurst