Transistor high fidelity amplifier ----- Class a Transistor Amplifier

Transistor high fidelity amplifier The author refers to a variety of amplifier circuits, making a high-fidelity amplifier. This function is pure, clear, and the principle is shown. V1 is enlarged to fixed biasing, provide >20 times gain. V2 is a voltage buffer, amplifying the high impedance voltage signal output from V1, drives current amplifier. The current amplifier is a typical circuit that pushes high-power transistors for more than ten years ago. In contrast, the V3, V4, V5, V6 series constitute Dawndon tube output, and it is still easy to feel freely, and it also reduces the current flowing through V2, the distortion is low, and the operating point is stable. At the same time, the resistance of the bias resistor R7, R8 is increased, and the input impedance of the current amplifier is further increased. Q1, Q2, Q3 and peripheral components form different DC detection circuits, and the control points are 0.7V. Since it is a common power supply, the relay should use high sensitivity high quality DC 48V relays. The debug is very simple. First adjust R2, so that the V2 E pole voltage is about 0V, then adjusts the R9 resistance, so that the static current of the power unit is 100mA, if the output midpoint voltage is deviated, the resistance of R7 and R8 should be adjusted. The R5 in the figure selects 2W resistance, R1 1, R12 to select 5W resistance, and other resistors use 1 / 2W metal film resistance. Capacitor is greater than 63V. Since this circuit is made of simplicity, it is not necessary to provide a heat compensation and overcurrent protection circuitry, and a larger area of ​​the radiator is required. The power transformer power should ≥ 250W. After debugging and audition, the imitation of the swan 2 speaker, the treble is crisp, and the bass is powerful. Author: 福 福

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