Page 1: Table Of Contents
How to Assemble the Balanced Headphone Amplifier Kit BDR-HPA01E (Estimated assembly time: 10 hours) o t o m a t s u Thank you very much for purchasing the Otomatsu amplifier kit. Please read this manual carefully prior to commencing assembling the amplifier kit.
Page 2: Introduction And Circuit Overview
BLT power amplifier and use it as a balanced model preamplifier. In addition, it will be possible in the future to enhance the performance by replacing OPAMP. Transformer Regulators module Case set Rev.1.0E All Copy Right Reserved by otomatsu...
Page 3: Assembling Headphone Amplifier Module. 2 Sets
G. Adjust 4.7k x2 YePuBlBr Br IN/OUT Jack x2 Bipolar Electrolytic C11 C12 Capacitor 470uF 16V G.Adjust 1k x2 BrBlBlBR Br No Polarity Green C13 C14 Electrolytic Capacitor 100uF 25V Polarity PCB with LME49600 Rev.1.0E All Copy Right Reserved by otomatsu...
Page 4 Those C11,C12 are Bipolar of specification. type electrolytic Capacitor Moreover, capability of output buffer IC LME49600 also increases as you They have no polarity. can reserve sufficient drive force for the load fluctuation of the headphones. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 5: Assembling The Balance Drive Module
+/- BrBlBlBr Br Long lead is plus + 120Ω x4 BrReBlBl Br Short lead is minus - 47Ω x4 YePuBlGo Br Other components have no polarity 100kΩ x2 BrBlBlOr Br Rev.1.0E All Copy Right Reserved by otomatsu...
Page 6 100k R7 120 R5 1k R9 1k CON2 R15 47 R17 1k Vcc+ Vcc- CON1 R4 1k 0.1u 0.1u 100k R8 120 R6 1k R12 120 R10 1k CON3 R16 47 IC2 NE5532P Rev.1.0E All Copy Right Reserved by otomatsu...
Page 7: Assembling The Power Supply Module
-16V -16V Additional terminal x2 are bundled in the case kit parts. Please mount the four terminals as shown in the below picture. Actual parts are little bit different from this picture Rev.1.0E All Copy Right Reserved by otomatsu...
Page 8 D11 1N4007 JUMPER JUMPER LINE x4 HS2 U2 LM317 D7 11EQS06 D12 1N4007 DC OUT VOUT 2.5-22V Troidal Trans 10VA 115Vx 4700u 50V 0.15u P2 5k 100u 25v 0.15u 10u 50V R3 240 Rev.1.0E All Copy Right Reserved by otomatsu...
Page 9: Case Set
Band Side Thermal shrink tube Back panel Isolation sleeve Front Panel Panel Sticker Hex socket screw Hex wrench There are spare screws in the box. Rubber foot Color of each parts might differ. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 10 Place Power module like this. GND screw hole Decide a position where No Pettet for Volume +Balance PC the INPUT RCA jack and the terminal of the power supply circuit board will not touch. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 11: Assembling The Back Panel
Since the volume is made of a conductive plastic material it will cause a humming noise to occur when you touch the knob, so certain connection between Volume control body and chassis ground is required. This is one technique for good SNR. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 12: Attaching Together Modules To The Case
Even though it may only touch slightly, it will hardly come off so do it slowly and carefully. Please pay special attention to this procedure. Do not touch the Headphone AMP PCB and Combo jack together here. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 13: Wiring The Power Supply
Jumper wire 上面図 Spark Killer No Polarity DC+（16V） DC- (-16V) Blue Use sleeve Black Power SW For easy wiring access, take out the side panel of the case. AC wiring LED register 7.5k Rev.1.0E All Copy Right Reserved by otomatsu...
Page 14: Wiring Signal Path -1, -2
Screw bottom XLR Combo pin assignment Compare to ¼`` male plug Sleeve Ring COLD Case GND Signal HOT Red Signal COLD Blue XLR Combo jack Signal GND Black Front view of XLR plug (male). Rev.1.0E All Copy Right Reserved by otomatsu...
Page 15 Good soldering hint : All wires should be pre-soldered by plating before wiring to the XLR socket. Good soldering hint: Wire should be pre-soldered to the plating before soldering , as shown as the below picture. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 16: Checking All Wiring
Balanced Headphone Amplifier kit , BDR-HPA1E 11. Checking all wiring All wiring is finished. Use thermal shrink tube for LED register Rev.1.0E All Copy Right Reserved by otomatsu...
Page 17: Checking The Voltage Level Of Key Areas
+16V +16V +16V +16V 8PIN +16V 4pin 0V 4pin 0V 4PIN 4PIN 4PIN 4PIN 4PIN 4PIN -16V -16V -16V -16V -16V -16V 4pin 0V 4pin 0V 8PIN +16V Volume should be turned off. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 18: Modification Of Headphone Cable
There is one LR cable, but there are 4 independent wires inside, so as you can see from the picture you can remodel it to the Before After balanced drive model. Rev.1.0E All Copy Right Reserved by otomatsu...
Page 19: Improvement Options
LME49600 and connect with each pin of 2 LME49600. In R8 9.1 1W R6 100k IC4 LME49600 C6 0.1u this case, the amount of heat generated increases, so attach R10 4.7k some adhesive to the top and bottom of LME49600.. C10 0.1u Rev.1.0E All Copy Right Reserved by otomatsu...