![]() If we adjust VR1, the Ra1 value is greater than C1 + R1. If we return to consider in figure 2, will see that C1, R1 & C2 + R2 are connected together that the value its Impedance will decrease as the frequency increases. See that the gain of the circuit is equal to the Rb / Ra. Those who want to use the pre microphone, you can modify circuit to new as Figure 3 The feedback circuit for microphone.Check the operation of the circuit by adjusting the Knob.Connect the output of the circuit to the main amplifier and bring the good signal to the input of the circuit.To apply the power supply to this circuit connects correctly. How to help the solder is easy to clean pins all the time.Because May cause equipment damage And copper may be peeling off. ![]()
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