E-H microsynth VCA problems, Hartery schematics

[oskar]

http://filters.muziq.be/files/schematics/eh_microsynth.pdf

This schematic has an error in the VCA section. Page 2 lower left quarter.
IC A14, pin 2 (along with R97) should connect to ground...      ---  I want one! Mommy, please?!

EDIT: resulting problems ------>      http://www.diystompboxes.com/smfforum/index.php?topic=43199.msg312636#msg312636

oskar

[StephenGiles]

Yes you are correct.

[oskar]

Oki, am I just blind or is this section completely missing from the Hartery pdf?     

http://img.photobucket.com/albums/v517/uncle_boko/EHmsynth1c.jpg

Are there different versions of the microsynth?   

And the VCA error is also present on this bass microsynth schemo...
http://www.harpamps.com/schematics/bsynth2.pdf

Does the guy who made these drawings frequent this fora? Errors or not I'm very gratefull for these drawings.   
I've tried to find a pcb to go with it but without any success... any ideas?

[StephenGiles]

The link to my album (uncle boko) shows the original EH circuits.

[oskar]

Q:

Oki, am I just blind or is this section completely missing from the Hartery pdf?     
http://www.harpamps.com/schematics/bsynth2.pdf

A: Yes! and Yes!
The three vca stages are replaced by potentiometers... good idea actually.

http://img.photobucket.com/albums/v517/uncle_boko/EHmsynth1d.jpg
http://img.photobucket.com/albums/v517/uncle_boko/EHmsynth1c.jpg
http://img.photobucket.com/albums/v517/uncle_boko/EHmsynth1b.jpg
http://img.photobucket.com/albums/v517/uncle_boko/EHmsynth1a.jpg

Thanks!

[swt]

i traced a real one, and a14 was wired like that. No ground connection there. Mine is working that way. At first i also thought there was an error there, so i double checked and the schem is ok...

[oskar]

The older (E-H IC 9 ) schematics shows a resistor to ground and the newer ( Hartery IC A14 ) don't. OTA's are sensitive to loud signals on the inputs and
you usually see dividers to take down the amplitude to something like ~1mV p-p. Without that connection to ground you'ld see a very large signal
on the input and I don't think it would be any good for audio use.
Did you meassure the resistance from input IC9 pin 2 ( should be 0 ) or 3 ( should be 1k ) to ground?

skar