Finally got the foxrox octron working

[Lost_soul]

It's the circuit with the switch and C21.



It's pretty normal to go over a circuit and kick the tires a bit.   No matter how much time you spend on it, next week you will think of something else 


Clearly pins 6 and 7 are connecting, even from the voltages.  You can get weird results like that when there's a bad connection (somewhere).  If pin 5 is really different to pins 6 and 7 I'd start to be suspicious the opamp has a problem.

Well you ARE right!!! The opamp really was the problem. I changed it and bam the voltages now across pins 5,6,7 are the same 4.8v. Thank you rob. Now as I understand the voltages are all right. I wish I could figure out how to read voltages and know what they should be at any point in a schematic but idk where to start.
I will try your mod in the morning and report back as it's 3 am here.
Thank you again man.

[Rob Strand]

Well you ARE right!!! The opamp really was the problem. I changed it and bam the voltages now across pins 5,6,7 are the same 4.8v. Thank you rob. Now as I understand the voltages are all right. I wish I could figure out how to read voltages and know what they should be at any point in a schematic but idk where to start.
I will try your mod in the morning and report back as it's 3 am here.
Thank you again man.

Cool you are pretty much there now.

For a lot of circuits the input and outputs of the opamps should all sit at about Vref (Vcc/2 or whatever).  There are a few instances where the multimeter loads down the voltages and you get less than Vref but you can have an idea that's going to happen if you see a 470k or 1M resistor there.   Things like oscillators/LFO are different.

[duck_arse]

I'm confused. I'm not sure I'm looking at the right, or current, thing. here, see what I see, pins 6 and 7 shorted, and the diodes not connected as per circuit dia, and 100k resistors, perhaps instead of 10k resistors.

as I say, I'm confused now, and daylight savings ends in an hour, so it's only going to get worse.

[Lost_soul]

I'm confused. I'm not sure I'm looking at the right, or current, thing. here, see what I see, pins 6 and 7 shorted, and the diodes not connected as per circuit dia, and 100k resistors, perhaps instead of 10k resistors.

as I say, I'm confused now, and daylight savings ends in an hour, so it's only going to get worse.

I am not sure what you mean. Isn't pin 6 and 7 connected together in the schematic? And there is a diode from pin 7 to a point and then another diode from pin 8 to the same point?

[duck_arse]

and here is the schematic:

when I look on this schem, which is the only one I can see in thread, I don't see a match. am I looking in the right place?

[Lost_soul]

when I look on this schem, which is the only one I can see in thread, I don't see a match. am I looking in the right place?

yes it's the right scheme. but could you elaborate what is the match you don't see? is it in the pin 6/7 and diode section or is it with the veroboard layout or what

we are discussing IC4 section. maybe you looked at another IC?

[PRR]

when I look on this schem, which is the only one I can see in thread, I don't see a match. am I looking in the right place?

That image is all whitespace and dim details. Here's where I see 6 and 7 connected.