Muff Fuzz troubleshooting

[greenacarina]

So I got my jacks wired up correctly and this thing will bypass, but when the effect is On I get nothing but random pops and crackles and some hiss. Here is the layout that I used- http://aronnelson.com/gallery/album17/EH_MUFF_FUZZ
I tried out my new audio probe and I get sound at the junction of the .01uf cap and the 100k resistor but nothing on the other side of that resistor. The only change I've made versus what's in the layout is my IC. I ended up getting a 9-pin single-row version of this IC (lesson learned about how to order parts). So, just to clarify how I wired this up...pin 1 is the top-left, and pin 5 is the top-right? I only used the first 8 pins of my IC...putting the first 4 where they correspond on the Vero and isolating the other 4 and running small jumpers to each appropriate strip. Are there any other methods I should use to test this circuit? Any critical information I can provide?
Thanks!
Chris

[greenacarina]

So, just to clarify how I wired this up...pin 1 is the top-left, and pin 5 is the top-right? I only used the first 8 pins of my IC...putting the first 4 where they correspond on the Vero and isolating the other 4 and running small jumpers to each appropriate strip.

Aw crap. I should have Googled first!
http://www.amiga-stuff.com/hardware/pinnumbering.html
Oh well, it's part of the learning process.

[greenacarina]

Well, I got the IC connected correctly and still the same result with my audio probe....no output from the junction of the 100k resistor and the 470k resistor. What should I check next?

Chris

[puretube]

the other side of the 470k...

[greenacarina]

Nothing but deafening silence there. I decided to try a voltmeter in different areas and see what I could find...and it looks like I have voltage up to the junction of the 470k resisitor and the 100k resistor, but not beyond. I'm thinking that I have a bad resistor!

Chris

[puretube]

at the connection of the 100k & 470k (inverting input of the opamp),
you`re not supposed to hear much...

but on the other side of the 470k (output of the opamp), you should hear/measure
a 5x louder signal!

are you sure, the IC is not "fried"?

[greenacarina]

Certainly possible. How can I test it?

[puretube]

sorry, but:

take out the "old" IC,
solder in a socket instead,
put an other IC into the socket,
listen again...

(I know, I know, it`s hard...)

[greenacarina]

Well, certainly a bit harder since my IC is SIP not DIP.
Might as well start over.