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  1. O2 headamp PM latch PC board to stop O2 low battery buzzing
  2. Headphone system - volume pot placement.
  3. 2 wires for Return Terminal and 1 wire for (+) Terminal in EXPENSIVE Headphone cable
  4. Too simple MOSFET ESL amplifier
  5. summing to mono
  6. Inexpensive O2 faceplates on Ebay
  7. Headphone amp on perfboard: layout critics welcome
  8. *For Sale* objective 2 Failed to launch *For Sale*
  9. Producing Headphones
  10. Need help building a headphone relay
  11. Low cost Stax headphone amplifier
  12. Douglas self_Ground cancelling & 0-impedance ??
  13. 3,5 to RCA cable
  14. RJM Sapphire build thread:
  15. Mistakenly ordered a 100k pot for O2 amp.
  16. Broskie Headphone Amp - frequency response
  17. Brig, any thoughts?
  18. Help with volume independent humming...
  19. Benchmark headphone amp-white paper by John S.
  20. Simplest headphone amp circuit (something like you'd get in a walkman or MP3 player)?
  21. ATTN: Beyerdynamic owners
  22. new opamps break in
  23. 32 Ohm- actual impedance at diff. frequencies?
  24. Gilberd headphone amplifier
  25. Acoustics in closed vs. open design confusing - help needed!
  26. O2 amp troubleshooting - help a newbie!
  27. Headphones for music production
  28. Headphone Data Sheet Table with power, voltage & current
  29. Headphone amp also used as preamp for long cable
  30. ground question
  31. Adventures in Headamp Country
  32. GIBRID TELEFONE AMP.
  33. Grado SR60 and a near field sub
  34. SCHURTER - 4802.2330 - SOCKET, 3.5MM JACK, PCB, 3POLE
  35. Receiver Headphone output - modifications?
  36. Headphone amplifier that runs on 5V?
  37. Headphones that pick up FM transmitted stations?
  38. Components for KA2209 headphone amplifier?
  39. stereo jacks look dangerous!
  40. Minimal headphone circuit.
  41. +/- 8/10V from 5V USB power converter
  42. Help choosing replacement headphones
  43. Bluetooth Headphones - Bluedio's "R+"
  44. Need help understanding current loops...
  45. Little-Bear B1 modding..
  46. Headphone amplifier using SJ2520
  47. Wich Over-Ear Headphones and a Soundcard or DAC/AMP Combo?
  48. How to DIY headphones?
  49. 19J6 Millett amp
  50. Valuable dual opa for headphones amp
  51. Need travel headphones < 300 dollars
  52. Objective + ODAC modifications
  53. Help my cmoy is popping caps
  54. SOHA II amp tripping
  55. cisco power supply, grounding and the Millett starving student
  56. cisco power supply, grounding and the Millett starving student
  57. Help Summing Two Headphone Outputs
  58. question re crossfeed for low imped phones
  59. 6DJ8 headphone amp
  60. THD vs bias voltage for ESL headphones
  61. Just for fun
  62. Creek OBH-21 SE problem
  63. Current source in diamond buffer
  64. Where do I start? (re: need a DIY amp project)
  65. 6N OCC 24awg single strand for headphones ?
  66. From amp w/ "bare wire" output to headphones...
  67. My new headphone amp
  68. Why are external amplifiers superior?
  69. Headphones and Hearing aids
  70. Reacheargeable CMoy Amp??
  71. Testing headphones
  72. Discrete op amp headphone amplifier module, based on Marantz
  73. Koss ESP9 Headphones Low Volume Fixed!
  74. Please help with DIY headphone amp.
  75. Huginn, High performance, Class A, Lateral FET headphone amplifier
  76. MAT12 / MAT14 based headphone amp
  77. DC servo for Sijosae Buffer
  78. connect two inverting op amps together
  79. Yet Another Cmoy - PCB layout with Eagle and making PCB
  80. How to prevent unwanted volume adjustments on volume knob of a portable amp
  81. Project Ember ?
  82. O2 and power questions...
  83. Beyerdynamic A1 clone gold, opamp rolling
  84. Is there a better way to implement buf634 other than place in a a loop?
  85. An early look at my new HPA design
  86. O2 XLR, St/Mono swtich, etc Mod. ?'s
  87. A question regarding bass boost and output buffers
  88. O2 headamp output booster PCB
  89. cMoybb op amp rolling with AD797BRZ
  90. Millett Hybrid Starving Student (12AU7)
  91. Good capacitors for cmoy
  92. mysterious headphones
  93. New 4 layer LME49610 Headphone Amplifier D1
  94. Simple Headphone's Amp for beginner
  95. upgrading x-can V1? anyone?
  96. Headphone Amps DIY for beginners
  97. some question about headphone amp (possibly the o2)
  98. Unknown Stax Headphones for SRD-7
  99. Moskido Hybrid headphone amplifier! Help needed
  100. Lowest capacitance hum-rejecting 4-wire headphone cable configuration
  101. Best amp possible for the hd-650
  102. Looking for a Headphone Amplifier
  103. Shure Earphones SE846
  104. Headphone equalization hardware and software
  105. VSSA FOR HEADPHONE
  106. pcb layout for grado ra1 ?
  107. grado ra1 clone
  108. Szekeres vs. PRR-SOL amplifier
  109. Optimal grounding
  110. 4 channel stereo mixer
  111. New PC setup.
  112. Class A Heaphone Amp
  113. DIY Headphone Tap + Passive Mixer
  114. Beats by Dr Dre headphones or alternative models/brands?
  115. In line sound limiter for headphones
  116. Adjustable Ear phone volume limiter
  117. MOSFET follower to my phone
  118. Crazy CMOY board
  119. starving student vs jonokuchi or hybrid vs tubes for hd600 and sr80i ?
  120. Tube/SS OTL single tube recommendations
  121. Pseudo Bravo headphone amplifier
  122. PUSH-PULL HEADPHONE AMP
  123. Single valve amp
  124. My desktop Objective2 amp
  125. O2 loud turn on transient fix help...
  126. Help wanted to find an old schematic
  127. Dual TPA6120A2 headphone design to eliminate crosstalk
  128. Need an AMP recommendation, and have a couple questions.
  129. Pot value in cmoy
  130. YAHA HELP
  131. OPA827 + Diamond Buffer
  132. newbie qustion
  133. Advice on USB Soundcard / USB DAC + Amplifier
  134. 6n2 + fu32 vacuum tube tube headphone amplifier
  135. Headphone amp recommendation required?
  136. Tube Headphone amplifier suggestions 2x(1:40) transformers
  137. Different grounding, different sound quality or what can be the problem?
  138. Radio Shack Digital to Analog Converter
  139. 2SC1815 alternative for Mini Zen
  140. Two-Way Headset Wiring
  141. whats worng with this circut
  142. Phono amp top slot board for O2 amplfier in B3 case
  143. Szekeres VE protection diodes?
  144. Headphone Amp Feels 'Electrified'
  145. Design Issue: Cascaded passive filer stages
  146. Headphone amp between source & amplifier - how to passthrough?
  147. Open Source Headphone Amplifier
  148. OPA2132/4 for headphones
  149. O2 LiPo Daughterboard
  150. Class AB with op-amp input, audible noise
  151. PCB check for a simple amp
  152. Home meade design AMP prob's
  153. Noise - how much is too much?
  154. Massively parallel LME49990 headamp
  155. Building the O2 - A novices build experience
  156. A Through-hole "Wire" Amp
  157. Adding a headphone output to CD PLAYER?
  158. Rod Elliot 113 - Headphone amp TOO MUCH GAIN
  159. Dual O2-Inspired, SMD Headphone Amp
  160. Low impedance phones, Please suggest amp design?
  161. Huge change in audio quality simply by changing the pads on headphones?
  162. what next, help please
  163. DIY isodynamic headphones?
  164. DIY replace jack plug: strange colors
  165. Canjam 2013 ?
  166. Can you disable DAC on O2 ODAC?
  167. Can i connect my sony pulse wireless heaset to a TV ?
  168. Audio controlled voltage mod.
  169. AKG K518
  170. Composite amplifier in class A
  171. A great Fostex T50RP amp?
  172. helmet speakers
  173. Ambisonics, and listening to binaural via speakers
  174. Cheap but linear headamp
  175. Thin Durable Flexible Wire to Fix Headphones
  176. If headphones are out-of-phase, can you hear it?
  177. Oatley K272 DC power options.
  178. A curious Inquiry involving internal headphone amp/powering multiple earbuds?
  179. recommend me a valve headphone amp - Beyer T1 & AKG Q701 etc
  180. HP amp out impedance vs. HP impedance
  181. O2 help with bass boost and 1/4 jack mods
  182. Anyone ever used LM4780 for headphones?
  183. Stax Type 1 headphone, anyone know what these are?
  184. DIY balanced headphone amp?
  185. Simple headphone amp from spare parts
  186. SENNHEISER HD800 Source Impedance
  187. TDA1308 - changing gain resistors
  188. Headphone Amp Selection?
  189. Classic v1 headphone amplifier
  190. RFI problems on diy headphone amp.
  191. power flickering on tube cmoy amp
  192. question about a circuit
  193. hello all is a dac worth buying
  194. Passive bell shaped EQ for headphones
  195. GLASS-SAND CLASS A TUBE MOSFET HYBRID HEADPHONE AMP
  196. HD650 can I fix this?
  197. Headphones Amplifier HIFI
  198. An "O3" - 35% smaller SMD RS O2 headphone amp version
  199. need help with headphones
  200. Moe'stevens O2
  201. Need help - using J A Burgess 45 SE amp for headphones
  202. Akai EIE Pro or Lexicon I-O|22 for AKGQ 701 [Specs inside]
  203. Power switch driver board(Momentary switch) + output relay board(delayed ON/fast OFF)
  204. OpAmps to drive HD650 from AK4399 Vout DAC
  205. Where to place current limit output resistor?
  206. Headphone amp noise. Help!
  207. USB DAC & headphone Amp with 3D Printed Enclosure
  208. DIY amp/DAC with better measurements than O2/ODAC?
  209. Battery powered 4W amp
  210. stuffing cotton balls in headphones?
  211. Measuring headphone FR?
  212. LM1875 based amp by Sijose
  213. A version of an O2 Desktop Amp (ODA)
  214. ESP P113 voltage gain of 1, will it work?
  215. The No Headphone Amp!
  216. Help Needed - Push Pull Transformer replacement
  217. Improving Bass Response On A Popular Hybrid Design
  218. Koss Esp-9 to ESP-9b Conversion... Help needed with grounding scheme
  219. High power headphone amp
  220. New Modular Headphone Amplifier
  221. full range planar headphones using neodynium magnets
  222. JLH Chiarra or Hifisonix Class A buffer?
  223. Sennhesier HD424
  224. 2-channel regular ground, dual mono or "balanced"/bridged?
  225. Jack Plug Wiring Help
  226. New Portable Amplifier Project started
  227. Pimeta V2 or O2?
  228. JLH Class A headphone amp from ETI not WW
  229. Left/Right Channel balancer
  230. Choosing a DC storage/rail cap for cmoy like amp
  231. Feedback resistor size - opamps
  232. Can I add a Potentiometer to these Headphones?
  233. Headphone distribution schematics
  234. Stax upgrade recomendations please.
  235. tube amp designs for low impedance headphones?
  236. headphone buffer/output for usb/dac
  237. Personal EQ & AMP for Hearing loss
  238. Grado RS1 headphones
  239. MOSFET Headphone Amplifier
  240. Lehmann clones
  241. which amplifier kit on ebay?
  242. Koss HV/1LC - specifications
  243. Headphone maximum power
  244. Output device for SE Hybrid Headphone Amp
  245. Output impedance as compensation?
  246. New Headphone Amp kit supplier in OZ
  247. suggestion for a 200$ headamp
  248. Replace Blackbox m10 3-prong jack
  249. Sony MDR-V6 changed?
  250. New portable amplifier

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