ROG "Splitter-blend" questions ...

[MartyMart]

I've just built one and after one small "de-bug" its working fine.
I first tried my Boss DC-2 on send/rtn green, with blend pot CCW
there's silence and fully CW full vol DC-2, so I put a small patch cable
across send/rtn red.
Now clean gtr is at CCW, but 1/2 way point seems like quite a volume
dip, between clean/chorused levels ...?
Have I got this right, or am I not seeing how to wire this up ?
The result I was hoping for was to be able to "blend out" some chorus
and flanger pedals, to clean them up a bit.... !!
But retain volume aswell ...

Thanks,
Marty.

[seanm]

Did you try flipping the phase polarity switch? The pedal may be inverting the signal.

[MartyMart]

yes I did, that seems to work ie: produces an inv tonal change, but the
vol drop is still quite serious at 50/50 on the blend pot ?

MM.

[MartyMart]

Bump ..... any ideas ??

Marty.

[MartyMart]

I'm wondering if it could be the position if my 1M to ground at the output jack.
I don't have that on the board, its direct between output jack tip and ground sleeve
Could this be the problem ?  wouldn't seem so, as it connects to common "ground"
same as all the in/out's and board ....

Thanks,
Marty.

[MartyB]

One small thought.......is your blend pot lin or log?  I think it needs to be linear.  Sorry, no other ideas.

[MartyMart]

One small thought.......is your blend pot lin or log?  I think it needs to be linear.  Sorry, no other ideas.

Thanks MartyB, it is indeed a 25k linear pot !!
Having tested it at higher volumes, it's not "too bad" but there's a definate
"hole" at the centre .... stumped !

MM.

[seanm]

Does it only happen with the one effect? It could be that the effect is just enough out of phase to affect the volume but not enough that the reversal can solve it.

I find that this phase problem is usually the biggest drawback to blenders. But it sually manifests itself as the clean and effected signals sounding like they are coming from different places. i.e. they sound layered rather than blended.

[MartyMart]

I hear what you're saying sean, it does seem to work very much like an "insert"
on a desk works, so I'm quite happy with it at say 75%.
So there's a touch more "dry" blended in.
It's just at 50/50 there seems to be this "dip" in volume.
I'm probably being too picky about this, all else works/sounds great !
I'll investigate some more tomorrow, perhaps I can find a solution with
the output section, using a couple of resistors to keep the "wiper" area
up somehow ....... thinking caps on !

MM.

[petemoore]

  Marty, Mine works the same way.
  I figure it's because there's 0 resistance with the mix pot at Cw or CCw, but in the middle there's 12k5 or whatever...seems a small amount for the size of the 'dip' in volume, a little 'distracting'...
  I have a Jfet Booster on the one sides output [after mix/before output jack], and a BMP on the other side, there's still the volume dip in the middle of the mix pot...
  I'm running it on 18v of battery power. I found out the headroom increase is good for me.

[donald stringer]

I have one of those built and I also notice the slight drop in vol. but other than that it works fine. One thing though, when the phase switch is on there is an distorting noise or something like that.

[seanm]

I wonder if an output buffer might help?