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Objective2 DIY Kit

Headphone Amplifier DIY Kit

$69 $59

In Stock

Kit containing all components to electrically assemble an Objective2 PCB: all standard resistors, capacitors, jacks, connectors, ICs, and circuit board. No battery, knob, or enclosure. Soldering required.

Overview

This kit contains all components necessary to build the Objective2 circuit board: all standard resistors, capacitors, jacks, connectors, ICs, and circuit board. No enclosure, batteries, or power adapter. Parts arrive individually packaged and labeled for your convenience. Soldering is required. All audio jacks are now black!

Assembly documentation can be found at NwAvGuy's Objective2 Details article. Documentation is archived at:
DIY Nwavguy O2 V11 Docs 30 Nov 2011

Enclosure and Power
To completely assemble your Objective2, you will also need an enclosure, volume knob, and AC adapter. The following default parts are offered separately, as many builders choose to customize the assembly to suit their needs:

 

You may optionally add 9V NiMH batteries and customize with different jacks as you desire. Components for optional modifications may be found in the DIY Objective2 and DIY ODAC categories. Please refer to documentation below for optional modifications:

DIY - Custom Objective2 Modification Guide
DIY - Custom Objective2+ODAC Modification Guide

Jan 2024: Please note the original Alps potentiometer is no longer stocked in North America! We will ship an original alternative for VR1, Alps RK09712200HA, which has a longer shaft. The Objective2 circuit board has two sets of pads at VR1, so be sure to mount RK09712200HA in the deeper (furthest back) position.

Performance

  • Frequency Response +/-0.1 dB (20Hz-20kHz)
  • THD 1 Khz 150 Ohms 0.0016%
  • IMD CCIF 15 Ohms 0.001%
  • IMD SMPTE 0.002%
  • Noise (ref 400 mV) -105 dB
  • Max Output (33 Ohms) 613mW
  • Output Impedance 0.54 ohms
  • Crosstalk (15 ohms) -65 dB
  • Channel Balance (50% volume) 0.6 dB
  • Battery Run Time 6-8 Hours

Dimensions

  • Gain 2.5x and 6.5x
  • Volume Potentiometer Taper Alps 15A or 3B
  • Batteries 2x9V LSD NiMH
  • Case Dimensions (mm) 108.50 x 80.00 x 29.50
  • Case Dimensions (in) 4.27 x 3.15 x 1.16
  • Weight 11oz

Connectivity

  • Input 3.5mm
  • Output 3.5mm
  • Power Battery or 14-20VAC

Packaged Items

  • D3, D4, 1N4002-E3/73, (QTY: 2)
  • D1, D2, D5, D6, 1N5818, (QTY: 4)
  • D7, MV5764.MP4B, (QTY: 1)
  • Q1, FQU17P06TU, (QTY: 1)
  • Q2, FQPF10N20C, (QTY: 1)
  • U2, NJM2903D, (QTY: 1)
  • U1, NJM2068D, (QTY: 1)
  • U3,U4, NJM4556AD, (QTY: 2)
  • U5, MC7812ACTG, (QTY: 1)
  • U6, MC7912ACTG, (QTY: 1)
  • N/A, 4808-3004-CP, (QTY: 4)
  • BT1, BT2, 12BC210-GR, (QTY: 2)
  • BT1, BT2, 12BC220-GR, (QTY: 2)
  • J2, J3, STX-3120-5B-284C, (QTY: 2)
  • J1, 163-7620-E, (QTY: 1)
  • S1, PN22SJNA03QE, (QTY: 2)
  • N/A, G003A, (QTY: 2)
  • C6, C7, C10, C15, C17, C18, B32529C224K, (QTY: 6)
  • C16, C21, SR211E223MAA, (QTY: 2)
  • C11, C12, C19, C20, K221J15C0GH5TL2, (QTY: 4)
  • C13, C14, MMK5225K63J06L4BULK, (QTY: 2)
  • C1, K105Z20Y5VF5TL2, (QTY: 1)
  • C2, C3, C4, C5, UVR1V471MPD1, (QTY: 4)
  • C8, C9, UPW1E221MPD, (QTY: 2)
  • R1, R2, MOS1CT52R221J, (QTY: 2)
  • R10, R11, R15, R18, MF1/4DC1R00F, (QTY: 4)
  • R14, R20, CCF5010K0FKE36, (QTY: 2)
  • R16, R22, SFR16S0001501FR500, (QTY: 2)
  • R17, R21, MRS16000C1001FRP00, (QTY: 2)
  • R3, R7, R19, R23, SFR16S0002740FR500, (QTY: 4)
  • R4, R5, R8, R24, 270-270K-RC, (QTY: 4)
  • R6, R12, R13, SFR16S0004022FR500, (QTY: 3)
  • R9, 270-33K-RC, (QTY: 1)
  • R25, 270-1.5M-RC, (QTY: 1)
  • VR1, RK09712200HA, (QTY: 1)
  • PCB, v1.1b, (QTY: 1)

Instructions & Guides