Diagram for Simple Switching

[ildar]

I've mushed together a diagram for primitive switching of 4 circuits in a sort of two-channel/2 circuits per channel setup. I plan on having these always powered and switching between them one at a time. I won't need or want to combine them at all.
None of the connections would intersect, though they do in the diagram.
My questions are:
1) Does this look right?
2) I'd like to have an LED indicator for each board. Since power will always be supplied, where/how would I implement LEDs for each?
3) Would I need extra pop protection with this kind of arrangement, assuming it would work?
Thanks!

[Seljer]

1.) Looks ok to me.

2.) Wire up the middle lug of each switch to ground, connect the negative side of the LEDs to the center top/center bottom lugs on the switches (and the + side of the LEDs to the resistor than that +9V)

3.) Assuming all the invidual circuits have pulldown resistors and such allready there shouldn't be any problems

[ildar]

Thanks for the help with the LEDs. I'm still concerned that I would get a pop when using the master switch, the center switch in the diagram. I don't see that it has any natural protection, so would a resistor to ground help here, or is it still unnecessary?

[zpyder]

I don't see that it has any natural protection, so would a resistor to ground help here, or is it still unnecessary?

The reason for pulldown resistors is coupling capacitors.  In most circuits we use a capacitor FIRST THING and LAST THING in the circuit to couple our AC signal into our DC circuit and vice-versa.  since the capacitors store energy, even when the effect is bypassed there is still some voltage across the capacitors.  When the effect is reactivated, this voltage will rush from the caps straight into our signal line, producing a "POP!".  So we put resistors in between our signal in and the coupling capacitor and between our signal out and the decoupling capacitor, so that when the effect is activated, that voltage from the capacitors has a path to ground, and therefore doesn't get into our signal.

So assuming that your circuits all have pulldown resistors, I would say that resistors in your switchbox here would be unneccesary.  I have heard some issues about pops produced by the change in voltage due to LED's turning on/off however.  That would be a seperate issue, and a search on LED pop or similar should turn up some info on that

zpyder