SSL Clone in 2*Mono

[sdR]

Hi everyone, i'm new to the DIY group !

I'm going to make a G-SSL Clone but I wanna it in 2 mono channels, not linked.
Do you have ideas on how to do that ?

I'm thinking about buying 2 times the PCB's, and put the right channel components on the second one. Is this possible ? maybe there are components values to change ?

Hope you can help me !

 

[abechap024]

Hello,
I've thought about that too! Great compressor for tracking mono sources IMO. But based on the design and pcbs currently floating around they use one separate VCA for the side-chain control voltage. So 3 vcas total.

If you wanted to make a mono unit you would probably want to rethink the design to make it mono VCA efficient...

something to think about anyway...

but if you just wanted make a quick 1 mono per PCB you would have to change the summing resistors to a lower value, or just get rid of them since you won't be summing 2 values before the side chain....

might be more things to change if only using 1 mono....maybe some resistors in the control voltage from the side-chain VCA so you have the correct ratios?

Maybe someone with more expertise can chime in
AC

 

[sdR]

Yes I was thinking about changing the input resistors so as to have U input * 4, or the resistors which sum the two channels before the side-chain. Indeed, we need an expert advice to know what components to change ^^

Thanks for your answer

 

[signalflow]

If all your wanting is 2 mono units then buy 2 sets of PCB's and only stuff one channel the sidechain and control board for each set.  The sidechain summing resistors can be adjusted after the fact if you feel it's not responding the way it should. 

Also this should have been asked in the GSSL Help Thread.
http://www.groupdiy.com/index.php?topic=47.0

-Casey

 

[sdR]

So, there is no components to change if I change the summing resistors before the sidechain ?
It looks too easy lol hope it works !

 

[signalflow]

Read through this post http://www.groupdiy.com/index.php?topic=35585.0 it should give you some answers.

-Casey

 

[abechap024]

Ok just from taking a look at the schematic I think you would want to change the side-chain input resistor from 47k to ~23k5 ...as a starting point.

That will make sure that your threshold is at a reasonable level.

Also with the control voltage, the circuit as is has the control voltage feeding 2 VCAs so if your going to omit one of the vcas you will have too much current feeding just one VCA making for a higher ratio than expected. Try increasing the 1k current limiting resistor to 1k5 to 2k5? I don't know what it would take to figure exact values but it would be easy to hook up a prototype and just stick in a trimmer resistor of some sort and hook up a meter and measure the input and output level vs the ratio to set it up correctly.

I could be terribly off so someone please feel free to chime in if I'm backwards.
Thanks
AC

 

[SSLtech]

Ok just from taking a look at the schematic I think you would want to change the side-chain input resistor from 47k to ~23k5 ...as a starting point.

LEAVE THE SIDECHAIN RESISTORS ALONE.

The Alan Smart, the ORIGINAL version from SSL, the Turbo, and all other variations APART from the GSSL use the same resistor.

And ask any further questions in the unified thread.

Keith