Dbx165A and Rms Detector

[richiyobs]

Hi Folks,
i d like to realize a sort of dbx 165A....
just simulated RMS Detector combined with THAT2180 for vca.
Followed design note00 by THATcorp, but replaced the detector 2252 with a sort of dbx 207/208, a useful design found into the forum.....
Also added a simple timing net for controls.
Hope that implementing the Stop Level circuit part as per dbx165A , i will get something close to the original device
Thanks for your attention
Best
richi

 

[richiyobs]

this one is Symetrix 501, and looks like they re using a similar detector, but not so expert to judge

 

[richiyobs]

trying to simplify....
my block diagram idea
still confused about limiter stop level part
i left out the automode and master/slave buffer for the moment
the simple timing net i m running is working on simulation, but still to calculate according to original 165A
Anyone interested on this device?
Thanks for your attention
best

 

[richiyobs]

finally.... these are my progress
thanks to Abbey s support i was able to understand how to better drive 2180 vca
maybe the meter driver should be reversed, i ll see
basically this design is a vca based comp, soon i will add the limiter part , to have same features like dbx165A
i m also having the strange idea to implement the limiter part and the clipper on Gssl compressor, since a control port on THAT-vca is not in use, but it s another story
thanks for attention
best
richi

 

[richiyobs]

also the limiter part looks working
can C9 node be used for stereo Link, or is better to pick the tracking reference from CV?
165A is using a dedicated buffer and detector for linking channels, master-slave mode...

 

[Script]

Uploading higher resolution images of the schematics might increase the chance of people looking at them. I can hardly discern anything there.

 

[richiyobs]

ups, sorry it s just the screenshot
this the max i can on this pc

 

[richiyobs]

Uploading higher resolution images of the schematics might increase the chance of people looking at them. I can hardly discern anything there.

I can send you or attach the asc file....
I have a basic and limited experience, so every suggestion is always well accepted
Best

 

[richiyobs]

The limiter part is not working properly... I m trying another configuration

 

[richiyobs]

high resolution pdf....

 

[richiyobs]

the clipper section is placed wrong.... it s designed to work for inverting stage....

 

[richiyobs]

thanks to useful suggestion i followed dn116 by THATcorp....
better responce, and also setted the gain staging to exploit its max headroom, i believe!
still working on limiter part

 

[richiyobs]

maybe the limiter part is now working.... followed THAT dn101 for peak detection....
the better response i had
red and blu 2 x CV, EC+ and EC-

 

[richiyobs]

this time used Auto detection on limiter part, dn114... seems to have no distortion at low freq