ZEROZONE HV4-MINI Class A Stereo headphone amplifier Base on Lehmann circuit | Электроника

ZEROZONE HV4-MINI Class A Stereo headphone amplifier Base on Lehmann circuit | Электроника

PCB size: 77*127*1.6MM FR4 Class A plate          The HV4-MINI is made with reference to the Lehman amp circuit. Lehman's ear is still famous in the industry, simple to manufacture, low investment, and good sound quality.        The HV4-MINI is a compact design that is designed for players with integrated amps (decoding-amps integration) and relatively limited space.   HV4-MINI highlights: 1. Compact: The PCB size after integration of M15 (15W transformer) is 75*127*1.6MM, FR4 A grade plate. 2, cancel the global voltage regulator, change to the power amplifier voltage regulator, the end of the tube is not regulated power mode, the dynamic is stronger 3. Change from the small loop feedback of the original machine to the large loop feedback to eliminate the influence of temperature drift 4, multi-gain setting changed to fixed gain setting (8X), suitable for most headphones 5, greater quiescent current, the final tube quiescent current is high 55MA, the class A power is increased, the sense of hearing is more alcohol.   This edition does not contain protection circuits and has related protection circuit related products. You can contact us.   School sound: OP+BUF circuit, the first three characters affecting the tone are: coupling capacitor, op amp, and output tube. Although this version is more MINI, but the materials are not shrinking at all, the three major parts are WIMA coupling capacitors, BB's OPA2604 bile op amp, Toshiba fever medium power tube A1358-C3421. The entire line produces 1% precision resistors. Japanese chemical large-capacity filter capacitor, energy constantly   NOTE: This is a DIY Kit, All parts need you weld and test.    Does not include a potentiometer.