by Alain Benoit » Thu Mar 24, 2011 1:30 pm
So to recap and simplify things for people who will not bother to read the whole thread, I don't even think I have.
Signal connections must always go from low to high so as not to load the output device. A 1:10 rule is good. For example when I built Christian's 'PAD' I designed it with an I/O of 10K. The output impedance of his mixer being in the hundreds saw a load of 10K and the pad having an impedance of 10K saw a load of 1M at the pedal, both instances the 1:10 rule was followed and no loading occurs.
The other factor is level which was handled by the 25dB pad designed in. The simple thing about Christian's device was that it stayed as an unbalanced T-Pad and he will not be using long cable lengths, so this will work, the 'cold' ring connection on his mixer's aux output will simply be ignored if he uses a TRS plug or shunted to ground if he uses a TS plug.
Gamblor has asked me to build him a reamp box. Assuming he plans on driving extended lengths from his recorder's balanced output to his amplifier in another room I will have to construct something that will handle the level difference, load properly, AND take care of properly unbalancing the signal. He also wants the whole deal for under $60.
Stay tuned.........................................