[sdiy] BOX-O-TRIX PCBs - last chance

[Seb Francis]

Well, since I was planning to do it anyway once the thing was finished, 
I've put all the info up on my website ...
http://burnit.co.uk/sdiy/index.php?page=boxotrix

I want to order the PCBs next week, so please let me know ASAP if you 
want one.


John Mahoney wrote:
> Seb,
> Can we see a parts list?
>
Yes, and full schematics on the link above.  There's nothing exotic or 
hard to get hold of.  A couple of THAT chips, everything else is very 
standard stuff.  You can use an LM3914 instead of the specified LM3916 
(will be better actually, I just happened to have LM3916s lying around).


> What are the power requirements?
>
It will run from a standard 15VAC 500mA wallwart.  It doesn't need this 
much current, but if the wallwart is rated lower it will probably need 
to have a higher voltage (e.g. 18VAC).

> What are the input and output signal levels?
>
The compressor and gate units will work with anything from line level up 
to much hotter (there's plenty of headroom).  The gain of the 
compressors is set by the Make Up Gain controls.  The gain of the gates 
is 1.

The distortion units will also work with anything from line level up to 
much hotter - just set the Drive controls appropriately.  The output 
levels are quite hot (~10V ptp), but can be attenuated with the Volume 
controls.

> And, just out of curiosity, what's the source of the compressor design?
>
It's taken from a couple of THAT design notes, and a 'linear enough' 
slew limiter circuit that Harry Bissell emailed me.

Seb