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  1. OPA2134 Input Stage...
  2. OPA2134+LM6172 composite amp ?
  3. dual purpose amp question.
  4. importance of output impedance for headphones?
  5. AKG 601 cable really BI-WIRE?
  6. OP-amp getting hot
  7. Headphone Amplifier project
  8. Modifying the SMSL SAP VI for low impedance headphones
  9. artwork on cans?
  10. My first Desktop HPA
  11. Volume control
  12. Best way to implement a voltage gain stage with opamp?
  13. DIY HEADPHONES
  14. Audeze LCD poor comfort – any mods?
  15. Headphone capsules: OEM stuff
  16. OPA2134/IRF510 Schematic...
  17. Need Headphone Amp Schematic for NJM4556
  18. Headphones for me, speakers for wife
  19. Headphone amp level = line level? (Maybe obvious question)
  20. My first HPA design...comments please!
  21. Transparent & Objective: My Objective 2 build
  22. My O2 Portable Amp
  23. O2 Front Panel
  24. My LM5532 Headphone Amplifier project
  25. CMOY with Common Collector Buffer
  26. CMoy Desktop with Buffers
  27. Objective o2 diy no sound
  28. Cmoy help please!
  29. µCmoy - My take on the portable CMoy amp
  30. My Headphone amp. Very diy...
  31. Opa2134 Max. Power dissipation
  32. 49600 single ended amp; I blew up the output caps!
  33. MultiLoop Amp Output impedance
  34. Need a small amplifier
  35. OPA2134 in parallel
  36. Desktop Cmoy with NJM4556 Buffers
  37. Portable headphone amp
  38. NJM4556 Output Impedance
  39. TPA6120A2 Input Bias Voltage Protection
  40. geek Wave DAP
  41. HPA-1 Class A Headphone Amplifier
  42. Very good Headphone Amplifier
  43. CMOY problem - any ideas welcome
  44. CMOY problem - any ideas welcome
  45. CMOY issues - all ideas welcome
  46. HELP: tuning for AKG601 + MJ mini tube amp
  47. Crosstalk issue with homebrew headphone amps
  48. A composite with LT1210 - another way of doing it
  49. CMoy Opa2134 minimum Gain
  50. Cmoy vs Chipamps
  51. DIY portable USB headphone AMP/DAC- recommended ICs?
  52. My first amp!
  53. Pot before a high pass filter
  54. CMoy Mod for drive speakers
  55. Old School tda2003 Headphone amp
  56. Noobie looking for a cheap heaphones amp
  57. Headphone amp from AN-272 Op Amp Booster Designs
  58. Elektor improved headphone preamp. Is it good quality?
  59. Cmoy with RA input?
  60. GAMECOM Headphone Cable
  61. Stereo crosstalk gets worse with frequency?
  62. Decware ZKIT3 Clipping
  63. WARNING hillyhifi
  64. 49600 Electrostatic Discharge Concerns
  65. So, your Grados are too bright?
  66. o2 flush gain switch?
  67. clip on heat sinks for TO-263
  68. Looking for a closed HP driver
  69. Headphone amp with RCA bypass grounding
  70. About Crossfeed concept
  71. Optimizing a TPA6120a2 layout
  72. Quality 6.35mm Stereo Headphone Socket?
  73. cmoy amp suggestions
  74. simple, high performance amp using DRV134?
  75. General Headphone Amplifier Survey
  76. O2 headamp PM latch PC board to stop O2 low battery buzzing
  77. Headphone system - volume pot placement.
  78. 2 wires for Return Terminal and 1 wire for (+) Terminal in EXPENSIVE Headphone cable
  79. Too simple MOSFET ESL amplifier
  80. summing to mono
  81. Inexpensive O2 faceplates on Ebay
  82. Headphone amp on perfboard: layout critics welcome
  83. *For Sale* objective 2 Failed to launch *For Sale*
  84. Producing Headphones
  85. Need help building a headphone relay
  86. Low cost Stax headphone amplifier
  87. Douglas self_Ground cancelling & 0-impedance ??
  88. 3,5 to RCA cable
  89. RJM Sapphire build thread:
  90. Mistakenly ordered a 100k pot for O2 amp.
  91. Broskie Headphone Amp - frequency response
  92. Brig, any thoughts?
  93. Help with volume independent humming...
  94. Benchmark headphone amp-white paper by John S.
  95. Simplest headphone amp circuit (something like you'd get in a walkman or MP3 player)?
  96. ATTN: Beyerdynamic owners
  97. new opamps break in
  98. 32 Ohm- actual impedance at diff. frequencies?
  99. Gilberd headphone amplifier
  100. Acoustics in closed vs. open design confusing - help needed!
  101. O2 amp troubleshooting - help a newbie!
  102. Headphones for music production
  103. Headphone Data Sheet Table with power, voltage & current
  104. Headphone amp also used as preamp for long cable
  105. ground question
  106. Adventures in Headamp Country
  107. GIBRID TELEFONE AMP.
  108. Grado SR60 and a near field sub
  109. SCHURTER - 4802.2330 - SOCKET, 3.5MM JACK, PCB, 3POLE
  110. Receiver Headphone output - modifications?
  111. Headphone amplifier that runs on 5V?
  112. Headphones that pick up FM transmitted stations?
  113. Components for KA2209 headphone amplifier?
  114. stereo jacks look dangerous!
  115. Minimal headphone circuit.
  116. +/- 8/10V from 5V USB power converter
  117. Help choosing replacement headphones
  118. Bluetooth Headphones - Bluedio's "R+"
  119. Need help understanding current loops...
  120. Little-Bear B1 modding..
  121. Headphone amplifier using SJ2520
  122. Wich Over-Ear Headphones and a Soundcard or DAC/AMP Combo?
  123. How to DIY headphones?
  124. 19J6 Millett amp
  125. Valuable dual opa for headphones amp
  126. Need travel headphones < 300 dollars
  127. Objective + ODAC modifications
  128. Help my cmoy is popping caps
  129. SOHA II amp tripping
  130. cisco power supply, grounding and the Millett starving student
  131. cisco power supply, grounding and the Millett starving student
  132. Help Summing Two Headphone Outputs
  133. question re crossfeed for low imped phones
  134. 6DJ8 headphone amp
  135. THD vs bias voltage for ESL headphones
  136. Just for fun
  137. Creek OBH-21 SE problem
  138. Current source in diamond buffer
  139. Where do I start? (re: need a DIY amp project)
  140. 6N OCC 24awg single strand for headphones ?
  141. From amp w/ "bare wire" output to headphones...
  142. My new headphone amp
  143. Why are external amplifiers superior?
  144. Headphones and Hearing aids
  145. Reacheargeable CMoy Amp??
  146. Testing headphones
  147. Discrete op amp headphone amplifier module, based on Marantz
  148. Koss ESP9 Headphones Low Volume Fixed!
  149. Please help with DIY headphone amp.
  150. Huginn, High performance, Class A, Lateral FET headphone amplifier
  151. MAT12 / MAT14 based headphone amp
  152. DC servo for Sijosae Buffer
  153. connect two inverting op amps together
  154. Yet Another Cmoy - PCB layout with Eagle and making PCB
  155. How to prevent unwanted volume adjustments on volume knob of a portable amp
  156. Project Ember ?
  157. O2 and power questions...
  158. Beyerdynamic A1 clone gold, opamp rolling
  159. Is there a better way to implement buf634 other than place in a a loop?
  160. An early look at my new HPA design
  161. O2 XLR, St/Mono swtich, etc Mod. ?'s
  162. A question regarding bass boost and output buffers
  163. O2 headamp output booster PCB
  164. cMoybb op amp rolling with AD797BRZ
  165. Millett Hybrid Starving Student (12AU7)
  166. Good capacitors for cmoy
  167. mysterious headphones
  168. New 4 layer LME49610 Headphone Amplifier D1
  169. Simple Headphone's Amp for beginner
  170. upgrading x-can V1? anyone?
  171. Headphone Amps DIY for beginners
  172. some question about headphone amp (possibly the o2)
  173. Unknown Stax Headphones for SRD-7
  174. Moskido Hybrid headphone amplifier! Help needed
  175. Lowest capacitance hum-rejecting 4-wire headphone cable configuration
  176. Best amp possible for the hd-650
  177. Looking for a Headphone Amplifier
  178. Shure Earphones SE846
  179. Headphone equalization hardware and software
  180. VSSA FOR HEADPHONE
  181. pcb layout for grado ra1 ?
  182. grado ra1 clone
  183. Szekeres vs. PRR-SOL amplifier
  184. Optimal grounding
  185. 4 channel stereo mixer
  186. New PC setup.
  187. Class A Heaphone Amp
  188. DIY Headphone Tap + Passive Mixer
  189. Beats by Dr Dre headphones or alternative models/brands?
  190. In line sound limiter for headphones
  191. Adjustable Ear phone volume limiter
  192. MOSFET follower to my phone
  193. Crazy CMOY board
  194. starving student vs jonokuchi or hybrid vs tubes for hd600 and sr80i ?
  195. Tube/SS OTL single tube recommendations
  196. Pseudo Bravo headphone amplifier
  197. PUSH-PULL HEADPHONE AMP
  198. Single valve amp
  199. My desktop Objective2 amp
  200. O2 loud turn on transient fix help...
  201. Help wanted to find an old schematic
  202. Dual TPA6120A2 headphone design to eliminate crosstalk
  203. Need an AMP recommendation, and have a couple questions.
  204. Pot value in cmoy
  205. YAHA HELP
  206. OPA827 + Diamond Buffer
  207. newbie qustion
  208. Advice on USB Soundcard / USB DAC + Amplifier
  209. 6n2 + fu32 vacuum tube tube headphone amplifier
  210. Headphone amp recommendation required?
  211. Tube Headphone amplifier suggestions 2x(1:40) transformers
  212. Different grounding, different sound quality or what can be the problem?
  213. Radio Shack Digital to Analog Converter
  214. 2SC1815 alternative for Mini Zen
  215. Two-Way Headset Wiring
  216. whats worng with this circut
  217. Phono amp top slot board for O2 amplfier in B3 case
  218. Szekeres VE protection diodes?
  219. Headphone Amp Feels 'Electrified'
  220. Design Issue: Cascaded passive filer stages
  221. Headphone amp between source & amplifier - how to passthrough?
  222. Open Source Headphone Amplifier
  223. OPA2132/4 for headphones
  224. O2 LiPo Daughterboard
  225. Class AB with op-amp input, audible noise
  226. PCB check for a simple amp
  227. Home meade design AMP prob's
  228. Noise - how much is too much?
  229. Massively parallel LME49990 headamp
  230. Building the O2 - A novices build experience
  231. A Through-hole "Wire" Amp
  232. Adding a headphone output to CD PLAYER?
  233. Rod Elliot 113 - Headphone amp TOO MUCH GAIN
  234. Dual O2-Inspired, SMD Headphone Amp
  235. Low impedance phones, Please suggest amp design?
  236. Huge change in audio quality simply by changing the pads on headphones?
  237. what next, help please
  238. DIY isodynamic headphones?
  239. DIY replace jack plug: strange colors
  240. Canjam 2013 ?
  241. Can you disable DAC on O2 ODAC?
  242. Can i connect my sony pulse wireless heaset to a TV ?
  243. Audio controlled voltage mod.
  244. AKG K518
  245. Composite amplifier in class A
  246. A great Fostex T50RP amp?
  247. helmet speakers
  248. Ambisonics, and listening to binaural via speakers
  249. Cheap but linear headamp
  250. Thin Durable Flexible Wire to Fix Headphones

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