ok here is an updated version of the schematic.
Attachment 16326
do you approve?
Printable View
ok here is an updated version of the schematic.
Attachment 16326
do you approve?
The idea of a switch is to cut the board off from the circuit of the battery and USB port.
The USB port will not be part of a complete circuit until you plug something in, so haveing a switch in that circut doesn’t accomplish anything.
You want to place the switch on either line from the battery to the step down module, and open the switch before plugging in your power source into the USB port.
so like this?Attachment 16327
I just realized you are showing a SPDT Switch, not a SPST Switch.
If you use a SPST Switch (open or closed are the only options) it can stay in that position.
If you want to wire in a SPDT Switch (basically think of a railroad switch, where one line breaks into two, you can direct the train to either based on the Switch position) there are multiple ways to do it.
One way would be to leave it where you have it in the diagram, and only wire the common post, and one out post, basically making it function like a SPST Switch (in the railroad example, one of the two lines is a dead end)
Another way to wire it would require you to rearrange the diagram, and it would be easier to draw that than try to explain with words.
so like this?
i removed the sd mod and replaced it with a ten amp battery cell.
Attachment 16338
ordered the new battery and switch
470 ohm 1/4 watt? or 5 watt?