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參數(shù)資料
| 型號： | LA1235 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大小： | 289K |
| 代理商： | LA1235 |
LA1235
No. 873- 8/13
Description of external parts
Effect
Part
No.
Function
If decreased
If increased
R201
Input resistance (Rg)
Causes matching wigh circuit of preceding stage.
R202
R203
S meter adjust
Current drain increases.
(Observe max. rating).
S meter pointer is off zero point.
(In case of voltage drive type).
R204
Muting sensitivity adjust
Muting sensitivity shifts to weak input side.
R205
Hysterisis adjunt
Large hysteresis.
Small hysteresis.
R206
Muting drive circuit load
Insufficient drive of detuning muting.
When driveing muting of LA3390 (MPX), make
less than 200k
Ω to prevent malfunction.
R207
Muting time constant
Abnormal detuning muting attenuation waveform
and abnormal sound at the time of low frequency
modulation.
Muting response delay.
R208
IF-off voltage applying resistnace
Large flow-in current at pin 5
(Observe max. rating).
IF-off does not occur.
(IF-off voltage
≥ 7.5V).
R209
R210
AFC, detuning muting band width,
tuning meter deflection adjust
Large detuning muting bandwidth.
Small detuning muting bandwidth.
R211
Detection coil damping
Small detection output.
Large detection output.
R212
S curve linearity correction
Find such a value as to cause minimum distortion (THD).
C101
C102
C103
IF amplifier bypass
Unstable IF amplifier.
C104
S meter output bypass
IF system may be unstable.
C105
C106
Muting drive output bypass
If low frequency AM compoent is generated in IF
signal, weak signal muting flutters.
Muting response delay.
C107
C108
Muting drive output smooth
Abnormal detuning muting attenuation waveform
and abnormal sound at the time of low frequency
modulation.
Muting response delay.
C109
AF output LPF
Unstable IF system.
With MPX connected, separation worsens.
C110
AFC output LPF
Muting attenuation worsens and
detuning muting bandwidth narrows.
Detunig muting response delay.
C111
C112
Constant voltage circuit smooth
S/N, muting attenuation worsen.
C113
Power supply bypass
Unstable IF system.
L1
Power supply choke
Unstable IF system.
Proper cares in using IC
Connect the ground side of bypass capacitors of pins 2, 3 to an area close to pin 4.
Connect the ground side of bypass capacitors of pins 6, 7, 10, 13, 16 to an area close to pin 14.
Use the shortest possible wires for detection coil-to-pins 8, 9, 10 connection.
Pin 13, being used for signal meter drive output, can be also used multipath detection because IF signal envelope
detected is output at this pin.
Coil specifications
Damping resistance
Supplier
Coil name
R211
R212
Remarks
Sumida
235S01
SNY-074-1919A
4.7k
Ω
7.5k
Ω
3.3k
Ω
2.4k
Ω
Containing fixed inductance 26
μF.
Containing fixed inductance 26
μF. (Improvement in temperature characteristic).
Toko
Q228CEL-1077B
13k
Ω
3.0k
Ω
Containing fixed inductance
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