i cant get mine to work, im 100(and ten)% sure my wiring is correct.............umm......i used green LEDs to bias the opamps and the only slight difference from the origanal schematic is that used a 56ohm resistor instead of a 51. I didnt socket the IC or transistors but i did heatsink them and i do solder fast. ive been debugging this for weeks and i cant find anything wrong............any suggestions?

Which OA did you use?
Is one or both LEDs lighting up?

Regards

RDV

Search the forum and you will find a lot of posts on debugging this effect.

First thing I would do is make sure your transistors are wired correctly.  Also make sure the polarity of the LEDs is correct.

One LED should be dimmly lit at all times.  The other LED should "follow" the signal fed from the envelope detector.  That is, with no signal, the LED should be out.  As the signal level from the envelope detector increases, the brightness of the LED should increase.

Good luck.

Are you 100% sure that you have the opamp oriented correctly? And that you didn't a single opamp in place of a dual opamp or vice versa?

Just an idea...

take some voltages yet? Aiudio Probe? Signal injecting?
 Getting any signa through?
 yupp I had one I thought about that way that din't werkng...But how many parts? I find problems once when doing a 'headcount' of components.
 Afte I find prob, I re-grade on a curve...

I have build it twice, with no succes either time.

I first made a pcb following runoffgroove's perf layout, and the leds worked but I got the undersignalitis problem. If I boosted (dist+, botth controls maxed out) the signal before the Nurse, I could hear it coming through, but at a very low volume, and the 'quack' worked  backwards.

So I got perf, and built it on it, following exactly the layout at runoffgroove. I realized I had missed a resistor in the pcb version, so I was very happy, because this time it was 'going to work'.

First, I put the resistor missing in the pcb...no change at all. Next, I finished the perf version, not luck at all...again!!!!

So there it is, waiting till I stop playing with my sansamp, and other boosters I'm so happy with.

SUERTE!

I was struggling with this one for a bit - the solution for mine was opamp replacement: junked the 72 in favor of a 4558, and raised the feedback resistor a scosh. All it needed was a bit more oomph getting to the env. follower tranny.

Yes running a small signal [SC's?] into the NQ might not have entough to activate the Env Detector...IIRC sometime it may be necessary to run a cct that boosts in front of NQ.
 And she will most liekely require some' tweeking to get the right amount going to the ENv Detector and produce a decent quack, when switching or resetting anything before NQ that alters signal input voltage.