LA4165M Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA4165M

Recording/Playback IC for Micro-Cassette Tape Recorder

SANYO -> Panasonic 

LA4165M

Continued from the preceding page.

• R7 : (100 to 300 Ω)

Select this according to the motor characteristics.

• R8 : (0 to 200 Ω)

Preamp negative feedback resistor.

• R9 : (3.9 kΩ)

Bias set resistor for electrostatic microphones.

The current into or out of the reference voltage pin (pin 21) should not be greater than ±1mA, or the biase of

other circuits will be affected. In particular, the power amplifier output power will be reduced.

• R10 : (15 kΩ)

Recording head bias set resistor. Since the bias reference voltage is the filtered DC voltage on pin 19,

excessive current should not be drawn by R10, or the reference voltage on pin 21 will be affected.

The following diagram shows the internal circuit of the reference voltage generator.

• R11 : (5 to 20 kΩ)

Select this to match the electrostatic microphone output characteristics.

• VR1 : (10 to 30 kΩ)

Adjusts the output level in playback mode, and the voice sensor sensitivity in record mode.

• VR2 : (5 to 30 kΩ)

Motor speed fine adjustment.

• LED : (Red LED)

Illuminated while recording. The LED starts to go out when VCC drops to 2.2 V, and is completely

extinguished when VCC drops to 1.8 V.

No. 2824-9/17

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