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Stereo Headphone Amplifier with Line Output

                                               Construction Kit

 

 

The First DIY KIT FROM 47 LABORATORY! 　　　                                              

We, at 47 Laboratory have created  the original kit brand “47 Treasure” for world wide DIY builders to enjoy.  As hobbyist, it is a joy to build your own projects  to enjoy with your favorite musics  as they are your precious treasures.  We will soon also manufacture other DIY  equipment, such as power amplifier, CD transport, D/A converter, MC/MM phono equalizer preamplifier, PC digital audio interfaces and some premium audio accessories.

Enjoy our simple structured and pure sound instruments.

 

Only the simplest can accommodate the most complex.

 

 

          

 

Specifications                                                                                          

POWER SUPPLY        AC100-120V, 220-240V

INPUT SOURCES      RCA pin jack (unbalanced) x3, selectable

SENSIBILITY            max 2.0VRMS (impedance: 50kΩ)

S/N                           very quiet

VOLTAGE GAIN        about 14dB (x5.0)

FREQUENCY             5Hz .. 120kHz (-3dB)

OUTPUT                    headphone jack (6.3mm standard plug)

RCA pin jack            line pre-amplifier output

POWER OUTPUT     100mW or more (impedance: 16..300E)

SIZE: W250 x H40 x D175mm

WEIGHT                  1.8kg (without power supply cable)

OPERATION           power switch, volume, input selector

 

 

Features                                                                                                  

 

- Very quiet (high S/N), vivid sound, real reproduction.

- Using discrete selected semiconductors (matched pair) .

- No IC component is used.

- No regulator IC for vivid and high speed sound with

  25VA toroidal transformer and superfast  recovery rectifiers.

- Voltage amplifier stage has minor loop NFB with JFET differential amplifier.

- Powerful output stage uses push-pull complementary inverted Darlington

  (so called “Sziklai pair”) circuit.

- No global loop NFB to block out emf from headphone voice coil.

- Available line pre-amplifier output from RCA pin jack.

 

 

Necessary Tools                                                                                       

- Solder, solder iron (ca 30W)

- Screw drivers

- Nipper, Pliers

- Wire stripper

- Multimeter for voltage measurement