MOTM

WARNING:  ADULT CONTENT
This message may contain graphic depictions of drilling holes, 
cutting traces, and the use of non-OEM parts.  If frank discussion of 
synthesizer modifications offends you, please delete this message now.


Since my system is going to have at least five 800 EG's, it might get 
confusing which woosh is which.  So I'm thinking of drilling holes 
and adding LED's like Moe has on his page:

http://www.hotrodmotm.com/800_mods.htm

While I'm sure that works (and it says he already tried it right on 
the webpage :) I wonder if there is an easier circuit that does not 
require adding a perf board.  Also, why is the LED in the feedback 
path, is that to reduce noise on the ground, or to give the LED a log 
response to the output voltage??

The outputs of the 800 already have TL072 as output buffers.  The 
positive output is divided by two 2K resistors, and the negative 
output takes that signal and uses an inverting follower (100K input, 
100K feedback) and a 1K output resistor.

If I simply connect an LED between the output and ground that should 
give me ~5ma across the LED at 5V.  Another way would be to tap the 
signal prior to the 1K resistor with another resistor going to the 
LED.  I'm thinking either of these should work.

I could draw less current from the outputs by driving the LED with a 
transistor, but I would like to avoid dangling parts.

Any ideas??