[Photo] The manufacture of bile duct integrated power amplifier


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This article introduces a "bile duct + integrated circuit" power amplifier, in which the bile duct is used for voltage amplification, pre-stage electronic frequency division, and the integrated circuit is used for power amplification.

1? The sound source is amplified by 6N11 pre-stage voltage, 6N11 pre-stage electronic frequency division, and then by LM1875 power amplification, the output power can reach 2 × 50W. This kind of circuit makes full use of the advantages of the tube and the integrated circuit. It has the characteristics of fast transistor speed, good frequency response, and good transient, warm and transparent sound quality of the tube.

2? The voltage amplification and electronic crossover circuits are both designed as cathode output circuits. Its output terminal is taken from the cathode of the electron tube, and the output phase and amplitude also closely follow the change of the input terminal grid. It has a series of advantages such as high input impedance, low output impedance, low nonlinear distortion and high stability. This circuit is better connected with the pre-stage sound source and the post-stage LM1875 power amplifier circuit.

3? The front-end two-channel crossover can overcome some of the defects in the common last-power LC crossover network. The separation of bass frequency and mid-high frequency frequency greatly overcomes the intermodulation distortion in the amplifier, and reduces the internal resistance of the amplifier and increases the power amplifier. Damping, so that the amplifier and the speaker have a good impedance match.

The frequency dividing circuit uses an RC second-order active filter circuit. In order to overcome the defect that the amplitude of the RC passive network drops too much (up to 6dB) in the pass band near the cut-off frequency point, a cathode output device is used in this circuit, thereby significantly increasing the gain of the frequency band near the crossover point and improving The filtering performance makes the frequency curve output after synthesis relatively straight.

4? The LM1875 power amplifier circuit and the traditional circuit have been improved in two ways: one is to cancel the negative feedback grounding capacitor, so that the power amplifier becomes a DC amplifier (due to the LM1875 output offset voltage is very low, only 2μV); the second is to increase R17 and R18 resistance, which R17 is designed for anti-no-load self-excitation, and R18 is a current negative feedback sampling resistor. This power amplifier becomes a current negative feedback DC power amplifier, which can overcome the deficiencies of the traditional power amplifier, which is rigid and shrivelled. Its bass dives and the resolution of the mid-to-high sound is enhanced. Especially the current negative feedback circuit makes the power amplifier have the charm of a tube. .

5? This power amplifier shares two transformers, one of which is dedicated to bile ducts; the other is dedicated to the LM1875 circuit, and the secondary has two 2 × 25V DC outputs for the left and right channels, which can increase the left and right sounds. The separation of the road.

After the machine is finished, the debugging is extremely simple. First connect the 4 low-end speakers (or fake load). Do not plug the bile duct first, turn on the power, and see if there is any fire or smoke. Use a screwdriver to touch the input capacitors C8 and C′8 of the post-stage power amplifier, and the horn should make a sound. Turn off the power, plug in the electronic tube, turn on the power, connect to the audio source for audition, and if there is no abnormality, connect the speaker to normal audition.

After connecting to the VCD, you will be surprised to find that the sound has changed to the "digital taste" of the past. The bass is strong and the mid-to-high sound is bright and slender. The sound quality is really rigid and soft, the gallstones are complementary, and the sound is pleasant.

Technical area detailed analysis of Doherty power amplifier design load traction principle (top) detailed analysis of Doherty power amplifier design how to improve efficiency (bottom) analysis of voltage follower input and output error analysis Solve the effect of power amplifier on emi

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