Need some help understanding this SSL schematic

[dustbro]

Interesting idea with the THATS chip.
It's an 8 socket IC, but from what I can tell from my posted schematic, all 14 pins werent used anyway. And it's about $10 cheaper.
Pinout for the THAT2252 is :
1 input
2 I Bias
3 Ground
4 Sym
5 V-
6 Cap
7 Output
8 V+

Keith.. would this work? Would there be any sonic differences?

 

[dustbro]

[quote author="clintrubber"]
Most likely the package-style, as you actually already listed. See datasheet for confirmation.
[/quote]
Thanks Peter...
Here's the info on the AD536AJQ

 

[dustbro]

In the schematic, to the left of the "compress ratio 10k lin dual" pot is a resistor labeled "A". Can anyone figure out what that is? also just pass that is resistor B... then tey show back up near the compress threshold pot.

 

[dustbro]

Can anyone tell if R6 is a 510R or a 910R?

The 250K log pots for the Release on the comp and gate serve 2 functions... pulling them changes the attack time. Anyone have a lead on where to get such a pot?

 

[kvintus]

R6 is 910R

The ratio pot is a 10K linear 2-gang pot. One half is marked A and the other one is marked B.

The attack/release thing could be easily done with a normal pot for the release and a separate switch for the attack. That's how I would do it.

Good luck!

/Anders

 

[dustbro]

Thanks Anders
Looks like I'm going to stick with the AD536AJQ over the THATs chip as per a suggestion from SSLtech... same thing with the switch for different attack times.
So... I'm basically going to try and design an XL Logic Rack with SSL4K modules.

I pretty much have the parts and components list going... Started the design for the faceplate. Next step is to pop open a channel on a console and see what's going on with the PCB.
Can anyone suggest what to do with a power supply? What would be needed and how do I distribute power to each channel?
Thanks in advance

 

[kvintus]

Great!

I have high resolution photos of the PCB somewhere on another computer. If/when I find them I'll post them here.

/Anders

 

[dustbro]

That is great news! Here's my starting concept for the faceplate... I wanna rack 8 of these guys in a 3U or 4U rack.
Switches for attack time are not drawn to scale. Can anyone suggest what switch to use?

I also added an output pot on the strip... anyone want to venture into and idea on how and where to fit this on the pcb?

 

[CJ]

The AD636 might be a newer 536 with better error specs and price and availability.

The AD 736 that I mentioned has the same core, they traded low current for reduced bandwidth. Lack of DB output pin seems to be the main obstacle for using the 8 pinner.
Heck, the 536 only uses 8 out of 14, wtf?
33 Khz should be enough for audio, tha Cav is gonna limit bandwidth possibly?

You might play with Cav once you get this thing built, to get different freq response of the comp.
Settling time will go up if you use a bigger cap.

 

[dustbro]

CJ,
Where is that parts list from? The 536 chip is $4 cheaper than I can find anywhere....

 

[CJ]

is off the AD website
search ad536

hey, look, they stole the API logo!
price might be for 1000 pieces

www.analog.com

 

[dustbro]

[quote author="CJ"]is off the AD website
[/quote]
Interesting... when you add something to your cart, the price jumps up... that 536 chip for $7.07 turns into $11 when it's in your cart. I guess that's the bulk price.

 

[dustbro]

[quote author="kvintus"]
I have high resolution photos of the PCB somewhere on another computer. If/when I find them I'll post them here.

/Anders[/quote]
Any luck with that PCB scan?

 

[kvintus]

Thanks for reminding me. No luck yet. I'm in the middle of moving to a new house so all my stuff is spread out all over the country. I'll check my backup drive later this afternoon.

/Anders

 

[dustbro]

[quote author="kvintus"]Thanks for reminding me. No luck yet. I'm in the middle of moving to a new house so all my stuff is spread out all over the country. I'll check my backup drive later this afternoon.

/Anders[/quote]
Great! Thanks man.
I wonder if I can just buy and return one of those XL Logic racks to see what's going on inside.... or pop open my buddys SSL to take some pics of the pcb.

 

[MLM]

any progress with this? always fancied cloning a couple of these!

 

[dustbro]

nothing yet, but it's still on my radar.