[sdiy] Compressor schematic

[Seb Carr]

Hi all, a few queries:
1- I have designed a fairly simple compressor, and i was wondering if any of
the more experienced people on this list would e willing to take a quick
look at it, and let me know of any stupid mistakes/flaws /shortcomings that
are instantly obvious to them, maybe suggest the odd improvement/ parts
change/ different values etc.

2-People say the 5532 op amp is not unity gain stable (therefore no use at
all as a basic unity buffer). what does not unity gain stable actually mean,
and can anyone suggest something else that is unity gain stable, but is
equally low noise?

3-Can anyone suggest a general purpose, low noise, low power npn transistor
for audio that would happily run off 30v supply, is available in the UK,
doesn't cost much etc for general experimentation and use.

thanks all

Seb Carr