The Integrated Amplifier which built in the mic
The power amplifier part has a pair transistor for
Hi-Fi to which the property was equal, and grounded-emitter inverted Darlington
Moreover, the first rank differential-amplification constant current drive
system is adopted as the driver stage. The monolithic IC of a differential
amplification is driven by a stabilizing supply, and the crossover distortion
at the time of a minute output is conjointly reduced with the constant
current drive original with a Lo-D.
An inverted darlington circuit not only obtains power gain in the power
amplification stage, but is a circuit system with which a voltage gain is
obtained, its nakedness gain is large, and a feedback is applied stably.
Furthermore, since the drive voltage of the driver stage is low and ends, it
has the distinctive characteristics that a using of the semiconductor excellent
in the noise figure is possible.
The linear drive monolithic IC with a
first rank differential amplification and built-in three-step
hardwired-connection amplifier is used for the equalizer stage.
first rank is a differential amplification, the it1 by power-source on-off does
The protection network is carried.
such as a mic mixing circuitry, a low filter, a loudness control, are carried.
The wood case was sold as an option option.
|<Power amplifier part>
|20Hz - 20kHz, both channel drive :
|1kHz, both channel drive :
|1kHz, one-side-channel drive :
|Dynamic power (IHF)
||0.5% (at the time of an effective output)
0.05% (at the time of 1 / 2 effective output 1kHz)
|Cross modulation distortion (70Hz:7kHz=4:1)
||0.15% (at the time of an effective output)
0.1% (at the time of 1W output)
|Output bandwidth (IHF)
||10Hz - 80kHz
||A, B:4ohms - 16ohms
Headphone jack: 4ohms - 16ohms
||40 (1kHz, 8ohms) or more
|Phono maximum permissible input
||Phono1, 2:150mV (RMS, 1kHz)
|An Output voltage/impedance
||Phono(RIAA deflection): 30Hz-15kHz±0.5dB
||Bass: ±10dB (100Hz)
||Low: 40Hz, 6dB / oct
|Loudness control (Volume-30dB)
||+ 8dB (100Hz), +4dB (10kHz)
|S/N (IHF, A network, input short-circuit)
Tuner, Aux, Tape PB: 90dB
|The semiconductor used
||Transistor: 21 pieces
IC: Two pieces
Diode: 17 pieces
||Power-switch interlock: One line
Power-switch un-interlocking.: One line
|Power dissipation (Electrical Appliance and
Material Control Law)
||Main unit: Width 435x height 144x depth of
At the time of a wood case using: Width 467x height 179x depth of
||Wood case LA-200 (6,500yen)