Introduction:
◆ Base on original Lehmann circuit, add earphone output protection circuit to protect your expensive earphones.
◆ The purple double-sided gold plated PCB has a very good process, and the gold plated process can effectively reduce the contact resistance.
◆ New and original German WIMA stepless capacitor, ERO decoupling capacitor, Nichicon KG 4700uFX2 large filter capacitor. Imported self recovery red fuse.
◆ ST brand new original BD139, BD140, F brand new original BC550, BC560.
◆ Use BB OPA2134PA original transport amplifier.
◆ The resistance adopts a new 718 military copper pin 5% metal film resistance.
◆ The volume potentiometer adopts the original Japanese ALPS-27 potentiometer and the Swiss Neutrik 6.35 headphone output block.
◆ PHILIPS BYV27 high-speed rectifier tube and ON LM317/337 linear voltage stabilizing j circuit are used. Compared with previous versions, the importance of power supply voltage stabilization is known.
Parameters:
Input voltage: AC 18V-0-18V
Frequency response range: 10Hz-35kHz
Adapting impedance: 8-2k ΩDistortion:<0.001% (6mW/300 Ω)
Output power: 200mW/300 Ω, 400mW/60 Ω
Input interface: Analog signal
Output interface: 6.3mm interface × 2 and Analog preamplifier signal output.
PCB Size: 150mm*105mm (Double-sided gold plated)
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.