Need advice on loop-box layout

[b97pla]

Hi all!

I want to modify a loop box to switch between two loops in an A/B fashion with one switch and bypass the loops using a second switch. I have no need for using both loops at once.

I have made a layout and I would very much appreciate your opinions and tips. I'm a newbie when it comes to this so any help is welcome!



T = Tip
R = Ring
S = Shell

[toneman]

i call this a "layout" or "wiring dirgram"
i have trouble following this layout.
first, U use a batt, but i don't see an LED.
unless the "triangles" are LEDs(?)
2nd, U don't have 2 switch gnd.
looks like U do that(?)
Are U using the jacks 2 switch pwr?
lastly, the layout doesn't clearly show which way the
DT3P is facing....
isn't there a page somewhere that shows an A/B box
schematic & Layout???
Or, can U redraw it as a schematic(?)
there must B.....

[toneman]

i call this a "layout" or "wiring dirgram"
i have trouble following this layout.
first, U use a batt, but i don't see an LED.
unless the "triangles" are LEDs(?)
2nd, U don't have 2 switch gnd.
looks like U do that(?)
Are U using the jacks 2 switch pwr?
lastly, the layout doesn't clearly show which way the
DT3P is facing....
isn't there a page somewhere that shows an A/B box
schematic & Layout???
Or, can U redraw it as a schematic(?)
there must B.....

[b97pla]

i call this a "layout" or "wiring dirgram"
i have trouble following this layout.
first, U use a batt, but i don't see an LED.
unless the "triangles" are LEDs(?)
2nd, U don't have 2 switch gnd.
looks like U do that(?)
Are U using the jacks 2 switch pwr?
lastly, the layout doesn't clearly show which way the
DT3P is facing....
isn't there a page somewhere that shows an A/B box
schematic & Layout???
Or, can U redraw it as a schematic(?)
there must B.....

Thanks for the answer. Like I said, I'm a newbie so please be patient with me ... I'll try to clarify a bit

1. Yes, the triangles are LEDs
2. I'm not really sure what you're referring to.. can you be specific?
3. The input jack switches power on and off (ring of input jack to minus lug of batt)
4. The 3DTPs are pictured vertically (if you see what I mean)

I don't think I can draw a proper schematic but the basic idea is that the top switch bypasses the loops and the lower switch alternates between the two loops. The LEDs are supposed to go out when you bypass the loops..

[Khas Evets]

General Guitar Gadgets has a bunch of switching configurations that may help you get your head around this.

It would be helpful if you colored the signal a different color than the power. I think there's a problem here. I usually start with a signal flow description in text. In this case...

Signal in -> on/off switch -> output or A/B switch -> Send A/B -> Return A/B -> on/off switch -> output.

I'm having trouble following your diagram, but here are a few comments.

1) You're swithing grounds for the LED's. I think that works, but I'm used to seeing the positive side on the switch.

2) You've hardwired a connection to both tips of the effect inputs. You were trying to ground the input when they're off, but isn't going to work.

3) You haven't grounded the sends or returns.

[b97pla]

General Guitar Gadgets has a bunch of switching configurations that may help you get your head around this.

It would be helpful if you colored the signal a different color than the power. I think there's a problem here. I usually start with a signal flow description in text. In this case...

Signal in -> on/off switch -> output or A/B switch -> Send A/B -> Return A/B -> on/off switch -> output.

I'm having trouble following your diagram, but here are a few comments.

1) You're swithing grounds for the LED's. I think that works, but I'm used to seeing the positive side on the switch.

2) You've hardwired a connection to both tips of the effect inputs. You were trying to ground the input when they're off, but isn't going to work.

3) You haven't grounded the sends or returns.

Ok , I've changed the picture a bit, the signal is now blue. I should say that I'm modifying an existing loop box that switches the two loops on or off independantly of each other.

1. This is the way it was wired up and I kept it that way.

2. As far as I could tell, this was the way it was wired... I tried to draw a picture of how one switch is wired now, i hope this one is easier to follow  
I numered the lugs on the switch and I figured the connection between lugs 4 and 9 was some sort of ground when the loop was bypassed. If not, what is it?



3. Right, I missed that.

[Khas Evets]

The second drawing is fine for a loop on/off switch. The 4/9 combo grounds the send to avoid pops when it's engaged. Use that for the top switch.

[b97pla]

The second drawing is fine for a loop on/off switch. The 4/9 combo grounds the send to avoid pops when it's engaged. Use that for the top switch.

Thanks! I've fixed the layout now, blue wires are input signal and the green ones are output.

So the 4/9 thingy is to eliminate pops... I've added that for the on/off switch but what about the switch that A/B the two loops, will I need a similar connection to eliminate pops when switching between the loops ow will this become an issue only when going from bypass to hot? You're not supposed to leave an input without ground when it's disconnected, right?

[ryanscissorhands]

It took me a second because I'm used to seeing the poles of a switch in the middle row, not th emiddle column. Or whatever--rotated 90.

It looks good to me, but I'm a newb, so don't exactly take my word for it. But I can say that it is now easy to follow the path of everything, which will make it easier for someone with more experience to double check its accuracy.


If it works, I might just build one myself.

[dandamantk]

Maybe Im blind... I dont see a layout anywhere, and i'd like to build this.

[MikeH]

Well it's been 5 years, the original image link is probably dead