FIG is a decay feedback tone control circuit. In the tone control circuit both have anti-attenuation Fed action. So high, in the end it is to enhance or attenuate the bass, and
sometimes not easy to distinguish. The following theorem using superposition circuit into line analysis. Superposition theorem states that in any linear circuit, the voltage of each branch, can be seen as separately for each source when used in this branch of the voltage generated by the algebraic sum. Figure 1-79 combined analysis, the base of the input signal voltage Vb, can be seen as such by the two sources are the result of the role that the input voltage signal voltage Vi people on the base is formed by an output signal voltage vo negative feedback voltage to the base of the formation.