Kit/carte finie pour amplificateur de casque Hi-Fi basé sur Lehmann classe A, préamplificateur LEM

About Lehmann: Lehmann (Lehmann) from Germany, is a specially designed phono amplifier and headphone amplifier fever of plants. Lehmann headphone amplifier (Lehmannaudio Black C-ube Linear), referred to as the big Lehmann, is an enthusiast of the high visibility amp, and Graham Slee Solo headphone amp is around 5,000 yuan price as well-known model (brand). Lehmann put ear S-ennheiser HD650 players known as the best partner in Europe exhibitions and professional sound studio is said to have a good reputation, even by many fans regarded as the Rolls Royce of the amp, amp comes with two 6.35 mm diameter headphone signal output interface, Lehmann with an impedance of 300 ohms headphones output power of 200mW, 400mW output power can be achieved when the mating impedance of 60 ohms impedance headphones, and its frequency range between 10Hz-35kHz, 95dB of noise ratio can reach more than, superior sound performance of the industry unanimous praise, the famous German record company STS Digital fever and the Netherlands have chosen Black Cube Linear The Master studio for listening purposes. Use ST BD139/BD140 Medium power transistor, JRC5532DD Op amp. The main filter capacitor adopts Nichicon 4700uF/35V x2, VISHAY MKT coupling capacitors. VISHAY and EPCOS decoupling capacitors. High-quality gold-plating6.35mm headphone jack. ALPS 16 type 50KA Potentiometer. ◆ Input voltage: AC 15V--0--15V ◆ PCB Size: 107 * 150mm ◆ Frequency response: 10Hz (-0.3db) - 35KHz (-1db) ◆ Distortion: <0.001% (6mW / 300R) ◆ SNR:> 95db ◆ Output power: 200mW / 300R; 400mW / 60R ◆ Power consumption: <5W ◆ Input impedance: 47kΩ ◆ Adapter Impedance: 8 - 2K ◆ Output Interface: 6.35mm X 2 ◆ LINE OUT: 60Ω ◆ PHONE OUT: 5Ω NOTE: We have DIY kit or finished board (Optional) ◆ DIY kit ---- All parts need you to solder and test it. ◆ Finished board ---- All parts have been welded and tested OK.