SBG-PID

[wallker]

The resistors R43 and R51 are selected according to the meter

I think that is best to change them with 25k trimmer.
At least I will do so.

[scs]

According to I meter. In 250microapers It's different from 1000 microamperes. Trimmer is for offset.

[dbanner]

Can you please say pulse width of control samples? And first sample delay?

[scs]

Delay diagram .I noticed errors in the pin numbers of op2,op3. Corrected scheme.

[wallker]

I don't see difference at OP2.
What was the error at OP2?

[scs]

The error is in the numbering of op. Now is good.

[scs]

A classic scheme, the SANDBANKS 150 also has a option pulse with a short duration .

[dbanner]

Yes OP1 is single Opamp, output on pin 6. I see nothing wrong with OP2.
The operation of the "set meter" trim, to set needle to center position?

[scs]

The error occurred because of the automatic numbering in the schema program.All op are double, type m0062. Is not only double op3, type lf 357. It is important who is in a who corpus. See the last diagram. Is correct.

[wallker]

I understand that all op amps are double, except LF357.
Only error that i did spotted was at LF 357, pin 1 and pin 6 are now swapped.
But i don't see nothing different at op2.

I just spotted now that you relabeled OP5 TO OP4.

[scs]

It is not good to be in 4 OP a corps. This is a crystal and they have an impact when amplifying more than 1.

[wallker]

I don't understand what u trying to say.
Should we use more than 3 x TL064?

[dbanner]

I think he saying don't use quad opamp, not good because they can be prone to oscillations in this circuit. Better to use dual. Two opamp in same body( corpus) which two is important depending on which part of circuit they are from. That's why I suppose he relabel.

[scs]

That is right. Operational amplifiers in one corpus have mutual influence. The diagram shows which are in one corpus .3 pieces TL062.

[wallker]

Schematic

Okay, so I think it's in the spirit of better understanding among us, time to publish a schematic that is easier to follow than the original one.
One warning, it may contain errors, I didn't double check it, so I hope that some of you can help with that.
Also the schematic is drawn on several sheets, and when joining a single page layout it didn't came out perfect, but I think is still easier to follow, later it will be improved.
Only the two resistors R43 and R51 are changed with trimmer, rest is original.
SBG-PID.pdf