Lehmann HV-4 Headphone Amplifier Kit / Board With ALPS 27 Type Potentiometer

Amplifier PCB : this is a Bare PCB. not include any other Components.
Amplifier kit : This is a kit, all the parts need to solder by yourself.
Amplifier board : This is assembeld and tested amp board.

PCB Size: 160X110X1.6mm

Works Voltage: Dual AC12-AC16V

Basic parameters

Input impedance 47 ohms
Gain: 10dB
Frequency Response 10Hz (-0.3 dB) to 35 kHz (-1 dB)
SNR> 95 dB at 0 dB gain (analogue)
THD <0.001% at 6 mW / 300 ohms
Channel Separation> 90 dB / 10 kHz
Output power 200mW / 300 ohm, 400mW / 60 ohms

HV-4 Highlights:

1, Optimize the power supply, the original machine use LM3X7 rectifier filter supply ripple 3-5MV, the voltage amplifier stage and input stage uses electronic filter circuit, the ripple is 7MV lThis amp ower ripple of the DC stable circuit audience,This amp using stability of DC circuit full-powered, lower ripple 390UV.

3, 300MV headphones for the protection circuit.

5, High signal to noise ratio.