C11 and C12 (Green) are in a
condition of slightly above the
circuit board because of the
wide pin pitch.
Please solder as close as
possible to the circuit board.
Those C11,C12 are Bipolar
type electrolytic Capacitor
They have no polarity.
AMP module completed
PCB
IC3,IC4
Output Buffer IC
LME49600 x2 are pre-
mounted.
1PIN is not connected
Please keep open.
R3, R4 are gain adjust registers
Please refer to “ 14. Future Development”
Left CH only
C3 0.1u
C11 470uF 16V BP
C14 100u 25V
-
+
IC1
LME49710
3
2
6
7
4
R5 100k
C6 0.1u
C2 3.3uF
R2 1k
R8 9.1 1W
C10 0.1u
R9 4.7k
R7 9.1 1W
R10 4.7k
C8 0.1u
-
+
IC2 LME49710
3
2
6
7
4
R1 1k
C7 0.1u
R3 2k
IC4 LME49600
2
1
4
5
3
C12 470uF 16V BP
R6 100k
C9 0.1u
C13 100u 25V
R4 2k
IC3 LME49600
2
1
4
5
3
C1 3.3u
C5 0.1u
C4 0.1u
Vcc+
GND
Vcc-
IN +
GND
IN -
OUT HOT
GND
OUT COLD
4
Rev.1.0E All Copy Right Reserved by otomatsu
2.2. Assembling Headphone amplifier module. 2 sets
The Portable headphone amplifier kit has a v/- 2 way power supply,
but in this kit, we changed to a real +/- power supply. There is no basic
circuit change except this.
By sup16V,-16V with this change, it can give the full performance
that OPAM has that are THD, SNR, Slew Rate, Frequency Response, ….all
of specification.
Moreover, capability of output buffer IC LME49600 also increases as you
can reserve sufficient drive force for the load fluctuation of the
headphones.
otomatsu
Balanced Headphone Amplifier kit , BDR-HPA1E
