Adding extra jacks for the effects loop (send / return)?

[jwroper]

Hi

Beginners question here...If I wanted to add send and return jacks to a pedal so i could run it through my effects loop as well as have regular input / output jacks, how would I go about wiring that up?

Cheers

[azrael]

Depends on the pedal, and what you're trying to do with the FX Loop.

[MrStab]

something of this nature was my first project. some more info would be handy - as Azrael said, it's not entirely clear what you're after.

short version: just take a feed off the input jack, connect it to FX Send, take a feed off FX Return and wire it to the output jack (along with the board output).

depending on the situation, you may need a buffer to isolate the signals & prevent feedback. but the effect you're using probably already has one. iirc it was only when i wanted to implement a blend knob that i needed a buffer (and so it began...)

[jwroper]

Thanks for the replies, I was trying to achieve something like the EHX memory boy deluxe which has separate return / send jacks. I think this just does the same as the input / output but gives the ability to have it connected in to the effects loop at the same time, but i just wanted to check i wasn't missing anything. Like this one:
http://www.ehx.com/assets/jpg240h/deluxe-memory-boy.jpg
I'm intending to box up a deep blue delay and a little angel in the same box to achieve something similar to that.

[ashcat_lt]

"EFFECTS LOOP — The Deluxe Memory Boy has an effects loop feature which allows other effects to be inserted into the feedback loop of the delay block, before the bucket brigade chips. Thismeans that you can put additional effects on your wet signal without changing your dry signal and each time your notes go around the feedback loop, they will also go through the effects loop."

This is significantly different from anything discussed in this thread so far.  Even if "all" you want is parallel in and out so that you can put it in (your amp's?) effect loop, there is a bit more to it than just hacking in a couple of jacks with straight wires.

1)  It is usually OK to split a lowish-Z output to two different inputs as long as those inputs are appropriately hi-Z, and relatively close to the same.  It is usually a bad idea to try to mix two outputs via straight wire - especially when one of the sources is likely to be as hi-Z as a guitar pickup and the other is as low as an active effect loop.  This would want at least some mixing resistors, and preferably a proper active mixing scheme to keep the sources from loading one another into mud or worse.

2)  Active effect loops tend to run closer line level than typical guitar level.  Depending on the headroom through the pedal you might need to pad down the input and possibly then boost the output for just the "loop" jacks.

I honestly don't see the use in this particular mod.  Why would you be trying to plug two rigs through this thing at one time?  Would you be switching back and forth?  How?

[azrael]

Some people like to add, say, an octave up to JUST the repeats.

Using this schematic as a reference:
http://3.bp.blogspot.com/-bEMBMvJwA5Y/TwrbbnpmzoI/AAAAAAAAAbw/EQ70PKQOFes/s1600/seaUrchin_Schematic.gif?dur=1284
You can insert a loop between R15 and the junction of R8, R9, R14.
Each repeat should go through the loop once.

EDIT2:
I just reread your post. You have misunderstood what the effects loop of the EHX pedal does. It does not connect the pedal to your amp like that. You put effects in that loop to change the sound of the repeats of the Memory Man.

[ashcat_lt]

Some people like to add, say, an octave up to JUST the repeats.

THAT I can dig, but it doesn't seem to be what anyone else has described.  I think the OP is confused as to what those jacks actually don on that pedal...

[azrael]

Yes, I reread it, and I agree, he has misunderstood. Edited my post.