Grounding lines to power LEDs, switch in electronic device

Question

Grounding lines to power LEDs, switch in electronic device

I'm self taught. My question concerns ground.

This is the bottom of a plastic device. Above, there is battery and LEDs. Positive feed (s+) enters south, at (A) it connects to line (s1) to a switch terminal (t1), and line (r+) to recharge port (p+). At (B) line (s2) from switch terminal (t2) enters to connect to line (s3) that connects to LED#1 pos. pad (#1+). LED#1 neg. pad (#1-) connects to line (s4) that connects to LED#2 pos. pad (#2+). LED#2 neg. pad (#2-) connects to line (s5), which connects to negative feed (s-) and line (r-) in area (C).

Lines (s+), (r+), (s3), (s4), (s5), (r+) are in channels. Copper lined?

Areas (A), (B), (C) -- copper lined?

(r+) and (r-) feed into isolated tubes. Copper?

(s3) runs from (#1-) tp (#2+). Ground issues?

Thank you for assistance. I am familiar with PCB. Did not know if grounding issues present in wiring up 'old school.' From responses, do not think it is. Greatly appreciate.

Answer 1

Before I try to answer your questions, I've redrawn your wiring diagram to make it easier to read. My diagram shows the exact same circuit as your diagram, but mine uses standard symbols and conventions, so this diagram will be much, much easier for other people to understand.

Here, S+ and S- are the "feed" and P+ and P- are the recharge port.

Now I'll see if I can answer your questions.

It looks like you have a plastic board with grooves in it for the wires to run in, and you're asking if you should line the grooves with copper. My response is that that doesn't sound like it would be useful. I've never heard of anyone doing such a thing before, and I'm not aware of any reason why it would help anything.

I'm interesting in hearing your reason for asking whether or not those grooves should be lined with copper. It sounds like you have some sort of concern here, but in order to help you here, I would need to know what your concern is.

Your other question is whether or not the connection between the cathode (or "negative terminal") of LED1 and the anode (or "positive terminal") of LED2 may cause ground issues. My response is that that looks like a completely ordinary, normal connection, and that connection isn't even related to grounding at all, so there doesn't seem to be any reason to suspect that it might cause ground issues.

However, I do notice one potential problem with your circuit, which is that there doesn't seem to be any current-limiting resistor in series with LED1 and LED2. LEDs usually have resistors in series with them, because without a resistor, even a small amount of excess voltage can easily damage the LEDs or cause them to draw too much current.