I think I have found a problem with the Bad Stone

[Sir H C]

So I have been looking at bluesdevil's bad stone project.  It has a problem when you start it up that the CD4009 will have 1.66 volts on pin 8 and the op-amp output that drives the rest of the pins will be at about .7 volts.  This is probably latching up the ESD structures and you can not get the oscillator going.  I am thinking of adding a schottkey from pin 8 to the bunch of gates to keep the ESD structures from turning on.  Is this something that is common, I don't see the op-amp's output at startup very well controlled and it can pull down and get everything in this odd state. 

Any other solutions that are used?

[Sir H C]

Any comments, points or other information that I am missing? 

[Zero the hero]

Here's my pin-to-pin voltage reading of the LM324:

1: 1.73 ~ 2.25
2: 3.29 ~ 3.56
3: 3.29 ~ 3.56
4: 7.54
5: 2.39 ~ 3.48
6: 2.50 ~ 3.48
7: 1.50 ^ 4.70

8: 1.50 ~ 3.40
9: 1.59 ~ 3.33
10: 3.28 ~ 3.55
11: 0
12: 1.55 ~ 4.27
13: 3.15 ~ 3.38
14: 6.20


I really have no clue why this one doesn't work...

[Sir H C]

Well your LFO is functioning correctly.  Are you not getting phasing, or nothing at all.  Seems your problem is in the rest of the circuit. 

[Zero the hero]

Well, actually, my Bad Stone is working perfectly... 

[Sir H C]

Well, actually, my Bad Stone is working perfectly... 

Ah, okay.  Well I have determined that the problem is that the 4009 is getting out of whack with the diodes conducting, but I still don't know why this happens only to this one.  Do you know the brand of LM324 that yours has?  Maybe they did a different design for the output stage on this one and it can pull lower (it did get to .66 volts which is quite low for a follower output) than other versions so that could be the key.