LA3210 Просмотр технического описания (PDF) - SANYO -> Panasonic

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производитель

LA3210

Equalizer Amplifier with ALC

SANYO -> Panasonic 

LA3210

Sample Application Circuit : Equalizer Amplifier with Automatic Level Control designed for Cassette Tape

Recorder, Radio

Description of External Parts

C1 : Input coupling capacitor (10µF)

DC current blocking capacitor used to prevent the DC current applied to the base from mixing in the AC signal

source.

The C1 is calculated using C1=1/2πfTzi (zi : input resistance, fT : low cutoff frequency). If the capacitance value

is too decreased, your set is subjected to inductive hum. We recommend using a capacitor of 2.2µF or greater. We

also recommend using 6.3WV or greater because the chemical capacitor becomes less leaky as the withstand

voltage gets higher.

C2 : Decoupling capacitor (33µF)

Used to bypass the power source ripple.

Decreasing the capacitance value makes the starting time shorter. We recommend using a capacitor of 33µF.

C3 : Bypass capacitor (100µF)

Used to AC-Short the emitter resistance and prevent AC components from being fed back to the input.

C4 : Output capacitor (10µF)

Used to block DC components and pass AC Components only.

The C4 is calculated using C4=1/1πfL · RL (fL : low cutoff frequency, RL : load resistance).

C5 : Phase compensation capacitor (30pF)

Used to prevent high-frequency oscillation caused by phase shift when a deep feedback is provided. It should be

noted that the high frequency response depends on the capacitance value of C5.

Continued on next page.

No.405–3/6

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