Simple and easy to shouting ----- Simple Amplifier

Simple and easy to call, Simple Amplifier Keywords: discrete component power discharge circuit diagram Author: Guangming I. Circuit structure and working principle As shown in the figure below, it is mainly composed of an input preamplifier circuit, an excitation amplifying circuit, and a complementary symmetrical power amplifier circuit of the composite tube. V1 constitutes an input preamplifier. R2 is connected to a deeper voltage parallel and negative feedback form, which can be stabilized by the circuit operating point, while the operating point of V1 is set. It is conducive to improving sensitivity. V2 provides an excitation signal for the incentive amplifier. W1, R5 is connected to the output, the transfer, and the DC negative feedback effect is also the bias resistance of V2, and the adjustment W1 can change the a point electricity. W2 and d are used to eliminate the trunking, and the adjustment W2 can change the static working current of the V2 and the composite tube. V3, V4, V5, and V6 constitute an OTL power amplification circuit of a composite tube. R9, R10 is used to stabilize the composite pipe operating point and reduce their penetration current. R4, C4 constitutes a bootstrap boost circuit to ensure that V2 has a large current output when strong signal. Second, the choice of components The main parameters and specifications of components are shown. Third, the installation and commissioning of the universal panel is first connected first according to the electrical principle, and check the incorrect debugging. Connect the 6V power supply (4 sections 5 battery) to adjust W1, make VA one 3V, talk to MIC speech and adjust W2 to make the sound quality effect, and then replace the fixed resistance of the corresponding resistance, if distortion is more serious The V4 and V6 collectors can be connected in series with a resistance of about 0.3 Ω (long, the paint bridge of 200 mm, diameter 0.08 is welded at both ends of 1K, and the folded painting wiring is wrapped around the resistor). If a self-excitement can add a 100P porcelain capacitor to the collector of V2 and the base. Fourth, function expansion A headphone jack is installed between the V1 collector and C3 can realize the conversion of the shoutal and the ambiguous (listening MP3, etc.).

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