Donald,
? My needs are still simple as I am just getting started with SMT and pcb's at limited times due to too many hobbies and other work. :) Simple led circuits and my last through hole pcb just allowed to make a series or a parallel circuit depending on how I populated it. This worked great. Now with the SMT version I supposed I could do the same trick and populate accordingly but figured the second side would be blank so why not use it. I guess I jest need to learn a few more things and maybe this is where the VIA comes in. Never used one but isn't that just a jumper from side A to B? And back to my circuits...I don't have any JST SMT headers but I have some through hole ones. So with a mix of through hole and SMT I was just concerned about doing it right with the power and ground. Only one side will ever be used and populated with anything. That said, I believe you already answered my question.
Thanks,
Dave
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On 11/13/2020 12:53 PM, Donald H Locker wrote:
It depends entirely on your needs. If you need to power both circuits
simultaneously, then (obviously) you need to connect power supply and
return (it's not ground unless it is really attached to the safety
ground somewhere) to both simultaneously. If they are always going to be
operating separately but always both populated, then it might be wise to
have two connectors (one for each side.) If only one side of the board
is to be populated (I don't remember the original post) then connecting
to both simultaneously would make sense, unless power routing for one
side would be compromised by this decision.
HTH,
Donald.
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On 2020-11-13 1:11 p.m., Dave wrote:
Harvey,
? I have a related question here after spending some time researching. I
already have a bunch of JST XH connectors and plugs, and pins and the
crimper. I wanted to design a total SMT pcb and I could solder the power
and ground wires to a pad. Then I thought about adding a JST header and
use a plug for power and ground. Problem is, the JST parts are all
through hole. So now for my question ( I may have a clue but will ask
anyhow to verify ), what is the best method on the board design to use
through hole and SMT at the same time? Will I still be able to do my
planned 2 different circuits on either side of the board? How should I
handle the power header? Use it to supply both sides of the board with
one header or use 2 headers for power/GND and separate the copper with
islands?
Thanks,
Dave
