LM4766 gallstone hybrid amplifier, LM4766 Power Amplifier
Keywords: LM4766, 6N2, amplifier circuit diagram
At the end of the 1970s, several young audio enthusiasts were a year to enjoy which high "times" dynamic music, but for the economic reasons, they had to think about the 8-inch large diameter bass horn. The iron basin stand is suppressed by the hardware farm factory. In order to buy the voice coil and paper pot, ride a bicycle on the summer 35 ° C high temperature running more than 100 kilometers, to Shanghai "Youth Electronics Store" to purchase 4 sets of sound circles and paper pots. Carefully, sweating on the way, but the heart is full of happiness. After the home, everyone will do it, inserted with waste movie film, the relative position of the tone and magnetic steel, fixed the relative position of the voice coil and magnetic, and the pellets and paper pots and basin shelf, whole, etc. Three days, to be solid, the connection is the same, it is excited to be excited. 'Dive 低 低 得 房 房 微 微 微 微 微 微 微 微 得People are crowded with rooms, and we have made us too much beef addiction. With the birth of the years, the increasing age is increasing, and the habit of appreciating music has gradually changed. In recent years, I like to make a cup of tea in the quiet room and taste the music flowing from the CD. To this end, try to use the LM1035, LM833, NE5532, with the TDA2030, STK4101 series, LH3875, etc., the actual audition results always feel unsatisfactory, the digital is too heavy, not hearing . Be
The electronic pipe sounds again on the hifi player stage, the temptation of the sweet warm tone, the author also germinates the desire to install electronic power amplifier. After a period of exploration, it is determined that the predetermined tube is used, and the post-stage uses high quality IC to form a sound power. The amplification circuit before the electronic pipe is quite mature. The author uses an enlargement of the left and right two channels of 6n2, 6N2 high cross-guided (u = 97.5) dual-triode, the post-level use integrated circuit amplifier LM4766, can output 2 × 30W (power supply) + 25V) does not distortion. Its internal various types of protection is perfect, and the peripheral components are simple debugging, and most importantly, in many integrated circuit power blocks, this LM4766 tone launched by American Semiors is closest to the tones of the inner tones. The specific circuit is described with reference to the drawings, and R1 is the gate leakage resistance of 6 N2 to discharge the charge on the gate and establish an appropriate gate negative pressure. R2 is the DC partial resistance of this stage, and the screen stream generates 1.4V voltage on both ends, causing the level to work in a linear, very good, which makes the input impedance, large dynamic range, instantaneous frequency Ok, it is suitable for input from the source of CD, DVD, Tuner.
The primary LM4766 integration is based on the standard circuit recommended by the State, including the metal film resistance of the resistance. The coupling capacitor selects red WiMA. The power transformer power should be more than 100W, which can be wound by GEB 30mm × 39mm. The 6N2 screen high pressure can be obtained directly from the mains, which makes this level of circuits simplify, but should pay attention to the insulation of this part of the circuit. The radiator of the LM4766 integrated block preferably uses a dedicated aluminum grid radiator, and if there is no 1 mm aluminum plate itself, the total area should not be less than 150 cm2 (15 cm × 10 cm). The heat sink can be grounded, but between the LM4766 and the heat sink should be applied to heat radiating silicon gel, and the intermediate pad into a high-temperature insulating sheet to prevent short-circuit. The entire circuit is installed on a 16cm × 12 cm epoxy plate in addition to the power transformer, according to the circuit of the circuit, hit the small hole in the position of the mounting resistance element, and then riveting with a small copper rivet, so that it is easy to crack and Replacement components, 6N2 9 foot holders should also be carefully packed, and the shell can be designed according to their own requirements. The power transformer is as close as possible to the power amplifier level and pay attention to ground shielding. Wiring is correctly usually successful. Author: Gu Xiao Yu
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