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published: Oct-31-2015, last edit: Mar-22-2020

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On this page links to all articles (mostly in pdf format) that can be viewed or downloaded.

More detailed descriptions of most of the downloadable documents is found HERE

Tutorials:

Audio Interconnect Performance, by R.A. Cooper (article) PDF format, 3MB
Check your power supply for noise (DIY guide, article, schematic) PDF format, 116kB
Headphone Power and amplifier properties needed (article) PDF format, 124kB
List of headphones with efficiency and power ratings (table, article) PDF format, 103kB
Resistance, Impedance, and other headphone related issues (article, tutorial) PDF format, 417kB
Calculators and tutorials on audio related stuff (link to website)

Headphone Articles:

AKG K550 / K551 modifications (tutorial, article) PDF format, 5MB
Audio Technica ATH-M40X (tutorial, article) PDF format, 1MB
Ausdom ANC7 modifications (tutorial, article) PDF format, 5.1MB
Ausdom M05 modifications (tutorial, article) PDF format, 8.5MB
Fostex T40RP-mkII modifications using DT770 pads (tutorial, article) PDF format, 3MB
Fostex T50RP modifications using SRH940 pads (tutorial, article) PDF format, 2MB
Philips Cityscape Uptown SHL9505 modifications (modifications, article) PDF format, 5MB
Sennheiser HD238 modifications (article) PDF format, 1MB
Sennheiser HD438 modifications (article) PDF format, 5MB
Sennheiser HD58X Jubilee (Massdrop) evaluation (article) PDF format, 3MB
Sennheiser HD650 modification compilation, extensive measurements (article) PDF Format, 13.5MB
Superlux HD562 modifications (article, DIY, tutorial) PDF format, 2MB
Superlux HD661 modifications (article, DIY, tutorial) PDF format, 2MB
Superlux HD662-EVO modifications (article, measurements, tutorial) PDF format, 4MB
Superlux HD681 modifications (tutorial, article) PDF format, 2MB
Superlux HD681 disassembly instructions (DIY, tutorial) DF format, 470kB
Superlux HD681 various pad measurements (article) PDF format, 5MB
Superlux HD681-EVO modifications (article, DIY, tutorial) PDF format, 5MB
Superlux HD685 modifications (article, DIY, tutorial) PDF format, 2MB
Superlux HD687 modifications (article, DIY, tutorial) PDF format, 2.8MB
Superlux HD688 modifications (article, DIY, tutorial) PDF format, 2.8MB
Stratocaster Woodies (measurements, report) PDF format, 2MB
Tyll’s measurements (link to Innerfidelity)

Amplifier articles:

Bravo v2 modifications (By Florian Gerard) PDF format, 1MB
C.H.Amp (Configurable Headphone AMPlifier) (tutorial, schematic) PDF Format, 2MB
Class-A single ended headphone amplifier using transformers for amplification (tutorial, schematic) PDF format, 1MB
Garage 1217, production manuals for all models (link to manufacturers website)
Garage 1217 Sunrise-II and Horizon (specs, report, schematics) PDF format, 2MB
Headphone correction filter (tutorial, schematic) PDF format, 2MB (PCB’s are no longer available)
Indeed G2 modifications, tube hybrid headphone amplifier (modifications, tutorial, schematic, article) PDF format, 3MB
In-line Kameleon for usage with headphone amplifier (DIY guide, article, schematic) PDF format 4MB
Kameleon filter module list (schematics, article)
Original Kameleon Portable headphone amplifier,  (DIY guide, article, schematic) PDF format, 1MB (PCB’s are no longer available)
Battery management circuit improvement for original Kameleon (DIY guide, schematic), 130kB
Kameleon-2 Portable headphone amplifier, (DIY guide, article, schematic) PDF format, 4MB (PCB’s available)
Battery management circuit improvement for Kameleon 2 portable amplifier (DIY guide, schematic), 130kB
Kameleon 2 DESKTOP headphone amplifier, (DIY guide, article, schematic) PDF format, 6MB (PCB’s available)
Miridiy tube hybrid headphone amplifier (modifications, tutorial, schematic, article) PDF format, 2MB
Op-amp test in C’Moy amplifier (report, article) PDF format, 733kB    
SeNNator headphone amplifier build tips (article, DIY) PDF format, 5MB

Other articles:

B.M.F.’s ARTA setup guide for beginners (tutorial) PDF format, 2MB
Foobar for Dummies (tutorial) linkt to PART 1  , PART 2 and PART 3  
Headphone measurement test rig, various tests (article, report) PDF format, 3MB
LAME XP setup tutorial for MP3-320kbs high-quality conversion (tutorial) PDF format, 890kB
PX625 / MR9 Mercury Battery Adapter (tutorial, DIY guide) PDF format, 514kB
PX625 / MR9 Mercury Battery Adapter (tutorial, DIY guide, Dutch/Nederlands) PDF format, 447kB
Reference Tweaks Miracle Wrap measurements (report) PDF format, 37kB

Schematics:

AKG K701 passive in-line filter (schematic) PDF format, 42kB
AMB M3 power supply alternative, removes the virtual ground (tutorial, schematic) PDF Format, 122kB
Analog King Tube buffer, reverse engineered (schematic) PDF Format, 26kB
Battery voltage monitor circuit with LED (schematic) PDF format, 38kB
Beyerdynamic T90 passive in-line filter (schematic) PDF format, 25kB 
Bravo Ocean hybrid amplifier, (schematic and modifications) PDF format 39kB
Bravo V3, reverse engineered, simple tube amp with 3-band equalizer (schematic) PDF Format, 15kB
DC protection circuit (schematic) PDF format, 27kB
Garage 1217, Project Ember first version (schematic) PDF format, 50kB
Garage 1217, Project Ember-II (schematic) PDF format, 50kB
Garage 1217, Project Ember 2.1 (schematic) PDF format, 50kB
Garage 1217, Project Horizon first version (schematic) PDF format, 50kB
Garage 1217, Project Horizon-III (schematic) PDF format, 53kB
Garage 1217, Project Horizon-3.1 (schematic) PDF format, 41kB
Garage 1217, Project Polaris first version (schematic) PDF format, 41kB
Garage 1217, Project Polaris-1.2 (schematic) PDF format, 42kB
Garage 1217, Project Solstice first version (schematic) PDF format, 61kB
Garage 1217, Project Starlight, first version (schematic) PDF format, 40kB
Garage 1217, Project Starlight-1.1 (schematic) PDF format, 41kB
Garage 1217, Project Sunrise first version (schematic) PDF format, 30kB
Garage 1217, Project Sunrise-II (schematic) PDF format, 50kB
Garage 1217, Project Sunrise-III (schematic) PDF format, 53kB
Headphone amplifier with BUF364 with Variable Cross-feed circuit (schematic) PDF format, 39kB
Hifiman Ortho filter HE-4, HE-6, HE400i, HE500, HE560 (schematic) PDF format, 81kB
Hifiman HE5-LE filter (schematic) PDF format, 82kB
Hybrid Tube amplifier with BUF634 output (schematic) PDF format, 43kB  specifications PDF format, 165kB  
Indeed G2, reverse engineered (schematic) PDF format, 27kB
Indeed G3, reverse engineered (schematic) PDF format, 25kB
Jays V-Jays passive in-line filter (schematic) PDF format, 25kB
Larks Guanzo headphone amplifier, reverse engineered (schematic) PDF format, 24kB
Little Bear B1 portable tube headphone amplifier, reverse engineered (schematic, modifications) PDF format, 42kB
Mains filters (schematic) PDF format, 42kB
Musical Fidelity X-can v2, reverse engineered (schematic, modifications) PDF format, 54kB
OPA-88HV hybrid tube headphone amplifier, proto for Garage 1217 project Ember (schematic) PDF format, 34kB
Panda amplifier (schematic) PDF format, 48kB
Panansonic WM61A microphone amplifier with FR correction circuit for headphone measurement rigs (schematic) PDF format, 32kB
Portable headphone amplifier using OPA2134 (schematic) PDF format, 20kB
Portable headphone amplifier with subtile Cross-feed (schematic) PDF format, 21kB
Powerbank keep-alive for powering low current devices from a powerbank (schematic) PDF, 22kB
Samson SR850 passive in-line filter (schematic) PDF format, 28kB
SeNNator for HD600 (schematic) PDF format, 34kB
SeNNator for HD650 (schematic) PDF format, 50kB
Sennheiser HD700 passive in-line peak filter, removes sibilance/harsh treble, (schematic) PDF format, 63kB
SFI driver amplifier (schematic) PDF format 17kB
Superlux HD660 passive in-line filter (schematic) PDF format, 42kB
Superlux HD668B passive in-line filter (schematic) PDF format, 28kB
Superlux HD681-EVO passive in-line filter (schematic) PDF format, 45kB
Subtile crossfeed RCA line level (schematic) PDF format, 28kB
Tube buffer schematic with opamp output circuit (schematic) PDF format, 34kB
Zigis C-Moy amplifier version-1 (schematic) PDF format, 21kB
Zigis C-Moy amplifier with charger (schematic) PDF format, 26kB

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