problem with bass paralooper

Started by gak, May 13, 2006, 06:03:33 PM

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gak

hey guys
i've just finished a bass paralooper from www.moosapotamus.net, using moosapotamus' layout...
i've built it with a tube reamer on the loop (without send & return jacks, just wired the tube reamer input and output)
both effect and looper seem to work fine, the sound is great
the problem is about the switching... when switching from effect to bypass it works fine... but when switching the effect on, there's a delay (almost like a second) before the effect sounds fine... before that sounds like the second you plug the power supply on a distortion stompbox (like a dead battery, etc..)...
here is a diagram of how did i wire the whole thing.... (also tried grounding output in bypass mode...)

(sorry for the crappy paint drawing...)
i'd really appreciate any help... it's supposed to be a birthday present so i need to finish it as soon as possible..
thanks!

gak.

Wounded Paw

I know it's a little late but I just joined the forum.  I had the same problem with the paralooper I just built.  I don't know why it is but i fixed it by putting a jumper on the bypass switch input side so that the circuit is always recieving signal even when switched off.

spudulike

Sounds to me like you're loading your power supply down and that second gap is the recovery time/inrush demand from a no-signal state (quiescent) to a full-signal state.
Running two effects off one power supply, with chunky caps etc for filtering etc on each effect ?

Wounded Paw

I was running a Paralooper on the same board as a Buzzsaw, both from Moosapotamus schematics, both on the same PCB sharing the same Boss 9V adapator.  I just added a trace from the 9v in of one circuit to the other and the same with the ground. 
The Buzzsaw doesn't have any huge caps on it.  I'd really like to know if this is going to be a problem because I plan on building several  units for bass which will include some sort of paralooper, parellelizer or splitter-blend setup ie. I'll have a buffer going to a cupla effects loops plus a clean signal and then blend them all together at the end.  I really don't want any kind of delay when I switch things on or off because I tend to do that quite often during songs.  Is this going to be a problem? 
And another question seems to be do you split the signal straight from the bass and then buffer the sends seperately or do you buffer the signal and then split it?  I've seen it done both ways.  Does it make a difference?

Wounded Paw

While I'm at it I have one more question.  I'm gonna split the signal to 2 effects loops and 1 clean channel and then blend them for the output.  I'll have separate volume pots for all three and no blend pot.  I want to be able to switch instantly between the 2 effect loops with one stomp.  I also want the option to turn the 2 loops on or off independently so that I can have one or the other or both or none on at the same time.  So how would I wire this up with the fewest number of 3pdt stomps and other switches?  I'm sure I could figure this out eventually but if anyone feels like doing the thought exercise, go for it.
cheers

moosapotamus

Sorry, I don't have a clue on that switching delay problem. Maybe you could test spudulike's idea by trying a higher current PSU, or by powering each circuit separately with it's own battery.

Preston
I'd suggest doing it all... an active splitter that buffers your bass signal and splits to separate buffers for each output.

And, maybe try adapting this for your switching question...
http://www.kilback.net/homebrewtweaks/pedals/pedals.htm#aby

best...
~ Charlie
moosapotamus.net
"I tend to like anything that I think sounds good."

Wounded Paw

I just realized that the standard Boss adaptor I've been using only puts out 200mA.  Wimpy.  I guess I should get a better one or build one or something and try that again.  I'd like to put a paralooper, compressor and eq in one box so more juice is needed.