Blown ic in Zombie?

[norbizzle2012]

first i breadborded the zombie chorus and it turned out great and sounded awsome but when i built the pcb from Geofex (thnx by the way)

i couldnt get it to work. On bupass it wass good and when i turned the effect on it would pass the dry guitar signal with some static and turning the pots wouldnt change anything. I used the excact same components as the breadboard and found no bridges or shorts. could i have maybe burned out the ic from soldering directly to the board without a socket?

Is there any way to tell if the opamps and the other ics are working, or if someone could show me thier working ic voltages and i could compare.

i used 2 tl062, cd4046, nte1641 (mn3007 equivilent)

[anchovie]

Post your voltages, don't wait for someone with a working unit to post theirs.

[dubiousss]

i breadboarded this too but both chips of mine didnt go so im wondering if the chips are ultra sensitive

[Mark Hammer]

The stock Zombie design relies on the properties of the TL062 and a fresh battery.  Unfortunately, there is no way to tweak the bias of the BBD to determine if the nonsignal is a result of bias drift.


As much as some folks love the MN3007, the reason why Matsushita came up with the MN3207 was that it could work with supplies as low as 5v.  This meant you could regulate a 9v battery down to 5v, and power/bias it with that super-stable voltage until such time as the battery had worn down to around 7v (by which time there was unlikely to be enough current left to power anything that needed 9v anyway).

[norbizzle2012]

ok here they are

V+ 8.11


IC 1 =tlo62
1. 5.00
2. 5.02
3. 2.47
4. 0.0
5. 5.19
6. 5.23
7. 5.26
8. 7.90


IC2 =nte1614
1. 7.96
2. 3.92
3. 5.04
4. 0.00
5. 0.00
6. 3.96
7. 5.26
8. 0.00


IC3 =tl062
1. 7.28
2. 5.00
3. 7.63
4. 0.0
5. 5.00
6. 3.47
7. 7.85
8. 7.90


IC4 =CD4046
1. 0.0
2. 3.88
3. 3.94
4. 3.94
5.0.0
6. .84
7. .83
8. 0.0
9. 4.99
10. 3.98
11. 3.69
12. 5.84
13. 0.0
14. 7.88
15. .02
16.  7.88

[anchovie]

Better take Mark's advice and use a fresh battery and see if it makes a difference. 8.11V is in no way fresh.

[norbizzle2012]

Thats problably it but when i first finished the effect on the pcb i had the pots wired wrong and idk if anything got shorted like U3

[norbizzle2012]

i replaced U3 and now i get a sound but its uneven like a heart beat instead of a steady beep