Universal pickup the interface in the discreet performance has the automatic adjusting of level on approximately 50 % the amplitude of signal (the negative pulse). Time constant of response on the change amplitudes depends on the condenser 1uF. Example usages are I2051
Complex can accept and other waveforms (the sine, triangle, square,..). Appears the only phase shift in respect to the passage on the zero (with the pozitinog on negative wave). Essentially is that is the amplitude of the negative wave at least 1V.