As a beginner i did not care about the signal
levels and range of all the modules i built.
After building a lot of modules from different
designers i was a little bit lost. There has been
a need of a module indicating what's going on.
This module has a selectable working range from
either 0V to +10V or -5V to +5V. it provides two
LEDs indicating the input signal exceeding the
the actual working range.
to use the spare front panel space i added an
additional cable tester (i had to isolate the sockets
from the panel, which has been a little bit tricky).