![]() IC1: LF353, Wide Bandwidth Dual JFET Input Operational Amplifier or NE5532N.PCB layout of this project The Shopping List Make a PCB as PCB layout and Assemble them as positioning devices. When they drive a circuit with low impedance, and the load applied to high resistance. Because the normal tone control and pre-amplifier will work best well. And IC2-NE5532N serves as a fine bass voice. The IC1-LF353 will act as the adjust the treble sound. And have Q2 is a constant current source circuit. Between input and this super tone control. We use the circuit of Q1, Q2 transistor acts as a Matching circuit. See Full Super tone control circuit diagram Sequential two-stage tone control which avoids inter-action between controls.įrom these principles, we can design the tone control circuit solutions.As circuit shown in Figure 6. How to modify so Maybe split both control circuit independent decisively as shown in figure 5 That is when we adjust the bass – treble would be with prejudice. When lower frequency so has the gain of the circuit as figure 4 then P, Q to R5-resistor that serves as a separate circuit, the 2 parts, not to interfere with each other. Then consider the P3 + C3 and C4 + R4 will see that resistance is even higher. In figure 4 VR1 serves as the Treble control. On the contrary, if we adjust the volume in the other direction. Behavior of negative feedback tone control (overlap effect exaggerated) 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. Be Careful of a beginner at every point soldering Requires heating the solder sufficiently to ensure that all solder points are very well equipped.If the number MPSA42 switches the position of the emitter and collector to the opposite direction.On PCB layout is used for transistors – BC557 or BC560C noise transistors types.The polarity of electrolyte capacitors must be correctly put on PCB.The actual size of the single-sided copper PCB layout and the component layout.
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