Test circuit composed of TDA6106Q with feedback factor 1/116

As shown in the figure, the test circuit of TDA6106Q with a feedback factor of 1/116. The input signal Vin enters the 3rd pin of TDA6106Q through the input network composed of R1, C1, C2, and R9. The 3rd pin is the inverting input terminal of the internal differential input stage. The amplified signal is output from the 8th pin and goes to the probe through the output network composed of R2, R3, C7, C8, and C9. The resistor R10 and the capacitor Cpar between the 3rd and 9th pins are the feedback network, which plays the role of automatic black level current stability. The resistor and capacitor Cn between the 8th and 9th pins are the bootstrap capacitors, which play the role of expanding the output dynamic range. The output pin 8 has cathode discharge protection. When the high-resistance source generates a peak positive voltage discharge, it can withstand a maximum current of 5A with a capacity of 100μC; when the low-resistance source generates a peak positive voltage discharge, it can withstand a maximum current of 10A with a capacity of 100nC. A decoupling capacitor must be added to the power supply terminal (pin 6).