μPC258, 4558

R03DS0145EJ0100 Rev.1.00

Page 7 of 9

2019.06.13

APPLICATION CIRCUIT

RIAA Pre-amplifier AV = 32.5 dB

Standard Characteristics (Reference Value)

Peak Level Meter

This circuit converts the peak voltage (about ± 10 mV ~ ± 10 V) of the input signal to a DC voltage (about 0.2

V ~ 1.3 V) and drives the meter.

This output voltage is proportional to the logarithmic value of input peak voltage, thus providing a wider

dynamic range indication compared to conventional linear indication methods.

0.0022 μF

0.01 μF

出力

33 μF

47 μF

2.2 kΩ

36 kΩ

390 kΩ

+

33 μF

1 kΩ

56 kΩ

10 kΩ

100 μF

100 μF

-15 V

+15 V

+

-

μPC4588

ひずみ率

0.03 % (VO = 1 Vr.m.s, f = 1 kHz)

雑音

1.0 μVr.m.s.

入力換算、入力ショート

ピーク検波平均値指示

20 Hz

0.001

0.01

0.1

1

0.01

0.1

1

10

出力電圧

VO [Vr.m.s.]

ひずみ率特性

-40 dB ~ +5 dB

(0 dB 時 1 Vp-p)

-

μPC4588

+

1/2

1S953

100 kΩ

1S953

対数圧縮

全波整流

ピーク･ホールド

メータ･アンプ

-

μPC4588

+

1/2

51 kΩ

30 kΩ

30 kΩ

-

μPC324

+

1/4

30 kΩ

1S953

+15 V

-15 V

-15 V

+15 V

1S953

1S953

×2

30 kΩ

30 kΩ

15 kΩ

30 kΩ

+15 V

-15 V

-

μPC324

+

1/4

20 kΩ

20 kΩ

10 kΩ

0.22 μF

2 kΩ

200 kΩ 3.3 μF

2SK163

100 kΩ

Distortion Rate

Noise

Input referred, Input shorted

average peak voltage value

Distortion Rate

Output Voltage

Output

(1Vp-p when 0 dB)

Logarithm Compression

Full Wave Rectification

Peak Hold

Meter Amplifier