KS Projects - Headphone Amplifier
High End Audiophile Headphone Amplifier Construction
Description
A high end headphone amplifier designed for the highest quality music reproduction with the minimum of distortion. An essential part of any good sounding headphones is the amplifiier that is driving them. Being capable of driving a wide range of headphones it will give you the best advantage in listening pleasure.
Uses only the finest audiophile quality components that have been carefully selected with no expense spared. Uses a National Semiconductors LME49710HA operation amplifier for each channel costing 20 times the price of an average op-amp. Carbon composite resistors used throguhout. High Qualtiy Evox Rifa, Wima, Elna Cerafine capacitors used.
Housed in an black anodised aluminium enclosure with an heavy duty clear anodised front panel. An heavy duty 40mm diameter machined knob with an audio grade ALP's volume controller. An high quality built in dual rail power supply using a ultra low noise torodial transformer and a very generous amount of post and pre regulation smoothing capacitance.
Specifications
Dimensions:
Frequency response:
Headphone impedance range:
Maximum output power vs impedance
input impedance:
Total harmonic distortion:
power consumption:
110 Width, 63 Height, 168 Depth
9Hz - 250KHz (-1dB)
10-1000 ohms
150mW@20ohm
205mW@50ohm
208mW@100ohm
144mW@250ohm
88mW@500ohm
50K ohms
<0.001% @ 1KHz
7W@240VAC
Component Selection
Operation Amplifiers:
Volume Potentiometer:
Resistors:
Input coupling capacitor:
Output Coupling Capacitor:
Feedback Grounding Capacitor:
Decoupling Capacitors:
PSU pre-regulator capacitors:
PSU post-regulator capacitors:
Transformer:
LME49710HA in a screened TO99 Can.
Alps RK27 also known as blue velvet
Carbon Composite
Evox Rifa MMK5
Elna Cerafine ROA
Panasonic ECA + Evox Rifa PFR5
Wima MKS2
Panasonic FC
Rubycon ZLH
Nuvotem low noise toroidal
Download Construction Plans
Bill of Materials (parts list)
Enclosure Front Panel Engineering Drawing