7/26/2023 0 Comments Transistor amplifire![]() Those who think to build this MOSFET amplifier project. It will help to produce high performance truly. We need to carefully use the transformer. But lets you select the filter capacitors are quite a lot. The features of the circuit are reduced, ostensibly. The R51, C23 are used to protect the oscillator in high frequency by connecting the speaker wiring and speakerįor this voltage, we use positive/negative 80 volts. The negative signal will enter to the below side differential circuit consisting of Q4, Q5 has the output signal from Q4 go to the driver circuit Q11, Q12, Q13 to driver power MOSFET works in a negative channel of a signal. The total gain of the circuit is determined with feedback circuits R24, R25, R26, C11, C12, and for this circuit the growth rate of about 220 times. With adjusting the idle current on VR1 for this circuit we should adjust the Idle current to about 80-120 mA. The transistor Q10 is setting a bias voltage value of the circuit. ![]() Typically, the maximum voltage will not exceed 15 volts. The diodes D16, D17, D18, D19 act as a protection to a gate of MOSFET, do not get too high a voltage driver. The capacitance between Gate-Source of N Channel will lower than P Channel of about 400pF (Normal the P-type will have a value of C=900pF, but N-type = 500pF) Why we put it as only side MOSFET N Channel. The capacitors C17, C18, C18, C20 protects the noise oscillator in this. The resistors R43, R45, R47, R49 that are at the source pin to help the average current through the MOSFET equal to the function of a circuit more stable. (2SJ162 MOSFET Q18, Q19, Q20, Q21 for the negative signal) The signal is amplified by the driver circuit consist of the Q7(2SA640), Q8(2SA640), Q9(2SA690) to as the signal voltage is high enough to drive the output 2SK1058 MOSFET Q14, Q15, Q16, Q17 for acts as the positive signal to the speaker. Base on the Figure1, which determine All complementary input form will consist of the differential circuit of two sets, the separate independent, responsible for driving directly both the positive and negative side output.Īs it can see that the positive side signal will be entered pass through the resistor R4 to the differential amplifier circuit with two 2SC1775 transistors Q1, Q2, which there are Q3 acts as the constant current source.
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