Piratepunch Optical Compressor.
Posted: 08 Nov 2007, 14:14
Thought I would make a seperate thread for this, stop clogging up the flatline thread.
Anyway, here's my optical compressor!
Anyway, here's my optical compressor!
You can see the changes that have been made below. Thanks to AG for showing me the way
As you can see it looks nothing like the flatline anymore. This is an old scheme, some of the values have be tweaked but until I look at my breadboard I can't remember which ones! It can do all sorts - mild compression to full out "swell" squish
Any of you guys got ideas for improvements/changes?Yeah, I've changed the value of the resistors on the input op amp to 220k and 470k, this also lowers the gain down to around 2.13. The lower input impedance lowers the noise right down.
The mica was used because it was the only 4.7p cap I had, I suppose you could use a ceramic with very little impact on sound. I couldn't be bothered with hitching up an input buffer Cool I'm too lazy Wink
On the schematic (I know it's hard to read and looks like 2.2uF) the input cap is 2.2nF - rolls of a fair bit of bass, a little too much in fact, I'm now using a 15nF input cap, rolls off at 48Hz - keeps the low end tight. I also lowered the output cap - 470nF. Rolls of Bass @ 55Hz this again was to keep the low end tight. For flat response (e.g no bass roll off of any kind) use input cap of 33nF and an output cap of 10uF).
With those mods it's quite a nice comp. Different to the regular offerings
