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Nurse Quacky: HELP PLEASE!

Started by slotbot, May 22, 2004, 01:04:14 PM

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slotbot

May 22, 2004, 01:04:14 PM
Hi Everyone,

I am trying to build a nurse quacky effect but so far i have been unsuccessful. I dont know what the problem is but here is a general description of the sound it creates:

The sound comes out of the pedal ok. it sounds just liek the input. The attack knob donst seem to change the sound and neither does the range knob. when the sensitivity knob is adjsuted teh sound becomes sort of muddier. but not liek a wah. it jsut sounds like a muddy tone is being mixed with the sound.

if you look at the led that goes to the attack knob from the ouput of the first op amp it lights up when you play. the sensitivity knob controls the overall brightness and the attack knob also has an effect on it.

I have looked at it until i go cross eyed and i cant see any errors/wrong parts etc.

I have swapped out the op amp. i have tried using a tl072, tl062 and rc4558 and they all have the same result. I have tried changing the leds from red to green and i have tried replacing the 3904. altough i tested the one that was originally in there and it was fine.

so if anyone has any suggestions please let me know. any help is GREATLY appreciated.

scott.

strungout

#1
May 22, 2004, 01:34:12 PM
Hmm if it doesn't wah, but the LED coming out the opamp follows the signal, I'd guess there could be a problem with the transistor as it is used as the variable resistance element that makes it wah. Search (link's up there) the forum for nurse, quacky, quack, dr and all variations, there's alot of info around about the Dr.Q/Quack/Nurse Quacky. That should help you out.

Ciao.
"Displaying my ignorance for the whole world to teach".

"Taste can be acquired, like knowledge. What you find bitter, or can't understand, now, you might appreciate later. If you keep trying".

jimbob

#2
May 22, 2004, 05:20:22 PM
I built this a month ago and had all diff problems including this one. You might recheck all values, bad caps-electro's. After that it started working--awsome little build!
"I think somebody should come up with a way to breed a very large shrimp. That way, you could ride him, then after you camped at night, you could eat him. How about it, science?"

Sic

#3
May 22, 2004, 09:47:47 PM
have you tested pinout voltages?

did you do it on perf or on pcb?

did you have to sub any parts?

all points to ground are grounded, and all not to ground is not to ground?

i had some problems with it at first... and i just scrapped it and remade it... worked beatifully!!!

post some more info and i will think about the probs i was having with mine... im sure we can get this figured out!!

god luck

-sic

jimbob

#4
May 22, 2004, 11:39:19 PM
I also had to do a rebuild. 2nd times a charm.
"I think somebody should come up with a way to breed a very large shrimp. That way, you could ride him, then after you camped at night, you could eat him. How about it, science?"

slotbot

#5
May 23, 2004, 05:52:39 PM
ok sounds like a rebuild might be good idea. ill try and do it today and post my results.

i double checked al lthe values again and everything is ok. im using the schematic from home wrecker. it says version 1.2. is this the correct schematic?
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