Aion Blueshift not chorusing

[Philthy]

thanks for that - I did get mine working - just need to bias it with a borrowed scope.
had three traces that I needed to jumper. must have went a bit heavy on the iron....

[gordo]

Good to hear.

[Timko]

Gordo, I would still love to hear all of this from you.  I am STILL having issues with mine.  You can post over on my thread (regarding the Biasing of the pedal). 

[DangYankee]

Hello Guys,

I'm super excited to find this thread, I just finished this marathon of a build to find my pedal has the exact same issue as Philthy's. (only my signal ends at the BBD's instead of IC2)

Symptoms:
1. Bypass signal  - fine.
2. Engaged signal  - no chorus effect. Sounds just like the bypassed signal with maybe a tad fewer highs (or more lows).

I have traced the circuit with an audio probe and have found that my signal "dies" at both of the BBD chips. I have signal from my guitar going into pin 3 of both BBD's, but nothing on pins 7 or 8 of either chip which I believe to be the output pins.

I am using a pair of MN3102 + MN3207 chips that I purchased on Ebay from vendor named diy-electronic. They had fairly good reviews, so I wasn't too concerned about the quality of the parts until now. Is it possible that I received a faulty pair of BBD chips? I ended up purchasing a new set of cool audio clone chips from Smallbear and will try those when they ship, but I will be waiting a week and my mind will continue to dwell on this project haha... I'm just wondering if there might be another issue I am overlooking.

My voltages are as follows: All measurements were taken with all switches in the down position. (Exclamation marks denote where my voltages differ, * shows fluctuation.)

IC1 (OPA2134)   IC2 (NE570)   IC3 (MN3207)     IC4 (MN3102)   IC5 (TL072)    IC6 (TL072)   IC7 (TL022)
4.6                    1.0                0                        6.6                   4.0-5.0*        2.8-4.0*        0.6-6.0*! (This transitions very fast, in 1.5 sec intervals)
4.6                    1.8                3.16                   3.1                   1.1-1.5*        3.3                3.0
2.3!!(why half?) 1.8                3.38                   0                      1.3-1.9*        3.3                2.2-4.2*
0.0                    0                   6.14                   3.2                    0                   0                   0
4.6                    1.8                6.58                   4.8-5.8*            3.3                1.2-1.9*        3.3
4.6                    1.8                3.15                   0.8-1.8*            3.3                1.1-1.5*        3.3
4.6                    3.2                4.0                     4.0-5.0*            3.0-4.0*        4.2-5.0*        2.6-4.1*
9.3                    1.8                4.0                     6.1                    6.3                6.3               6.66
                         1.8
                         1.8
                         1.8
                         1.8
                         9.3
                         1.8
                         1.8
                         0.12
                         

IC12 (OPA2134) IC11 (NE570)   IC9 (MN3207)     IC8 (MN3102)  OPTO (H11F1)
4.6                    0.95                0                        6.5                 1.3
4.6                    1.8                  3.1                     3.0-3.1*          0
4.6                    1.8                  3.4                     0                     0!!!
0                       0                     6.1                     3.1-3.2*!         4.25
4.6                    1.8                  6.56                   4.6-5.4*          3.8
4.6                    3.0                  3.1                     .8-1.8*            4.25
4.6                    3.0                  4.6!!!                  4.3-4.9*
9.3                    1.8                  4.6!!!                  6.1
                        1.8
                        3.0
                        3.0
                        1.8
                        9.4
                        1.8
                        1.8
                        1.0









Any help would be appreciated!

-DangYank