LA4165M データシートの表示（PDF） - SANYO -> Panasonic

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LA4165M

Recording/Playback IC for Micro-Cassette Tape Recorder

SANYO -> Panasonic 

LA4165M

Continued from preceding page.

• C10 : (10 µF)

Voice sensor transient suppression. This prevents the motor drive from being turned on by large transient

pulses.

• C11 : (47 µF)

Determines the time constant for motor drive hold after the voice sensor circuit turns off. The motor drive

remains on for approximately 4 to 5 seconds if the resistor in parallel with R5 is 300 kΩ.

• C12 : (4.7 µF)

Together with series resistor R8, determines the preamp low-frequency cut-off. For C12 =4.7 µF and R8=100

Ω, the cut-off is approximately 200 Hz. The cut-off can be set to approximately 100 or 300 Hz by giving C12

a value of 10 µF or 2.2 µF, respectively.

• C13 : (0.47 µF)

Preamp input coupling capacitor.

• C14 : (2200 µpF)

EMI suppression capacitor. Select this according to the characteristics of the record/play head.

• C15 : (3300 pF)

Microphone input high-frequency filter.

• C16 : (220 µF)

Reference voltage decoupling capacitor.

• C17 : (220 µF)

Head DC supply ripple filter.

• C18 : (220 µF)

Supply decoupling capacitor.

• C19 : (1 to 10 µF)

Reference resistor (R7) bypass capacitor. Setting should be performed according to motor characteristics.

• C20 : (1 µF)

Load (motor) bypass capacitor. Setting should be performed according to motor characteristics.

• R1 : (5 to 15 kΩ)

Determines the flow of AC current through the head. Select this according to the head characteristics and ALC

level.

• R2 : (820 Ω)

Determines the microphone input level at which the voice sensor starts operating when VR1 is at minimum.

Larger values for R2 give voice sensor operation at lower microphone input signal levels.

• R3 : (3 kΩ)

Improves high-frequency response and reduces high-frequency distortion. Distortion above 5 kHz increases as

R3 decreases.

• R4 : (100 kΩ to 3 MΩ)

Determines ALC recovery time.

• R5 : (300 kΩ)

Voice sensor circuit control current resistor. R5 and C11 form the motor drive hold-time constant.

• R6 : (20 to 70 kΩ)

Determines motor speed. Select this according to the motor characteristics and the value of variable resistor

VR2.

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