AM/FM 1 CHIP RADIO |
S1A0427B01 |
INTRODUCTION
16−DlP−300A
The S1A0427B01 is a monolithic integrated circuit designed for portable AM/FM radios or AM/FM clock radios.
FUNCTIONS
• AM RF & MIX |
• AM Local OSC |
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• AM AGC |
• AM/FM IF AMP |
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• AM/FM DET |
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Audio Power AMP |
• Regulator |
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FM AFC Control |
FEATURE
•Portable AM/FM 1-chip radio
•Wide operating supply voltage range: VCC = 3V − 12V (Approximately ) (Depending on the internal regulator tolerance)
•Recommended operating suply voltage: VCC = 4.5V − 9V
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Vcc |
4.5V |
6.0V |
7.5V |
9.0V |
Line Operated |
RL |
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8Ω |
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O |
O |
O |
X |
X |
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16Ω |
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O |
O |
O |
O |
X |
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45Ω |
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O |
O |
O |
O |
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•When using the AC line as an internal shunt regulator mode, it is possible to use a low cost application without a transformer (approximately 42mA)
•IF AMP gain is determined by the DC voltage appearing at IC Pin 16.
•Power output: PC = 0.28W (Min.) at THD = 10% (Vcc = 5.5V/8Ω).
ORDERING INFORMATION
Device |
Package |
Operating Temperature |
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S1A0427B01-D0B0 |
16−DlP−300A |
20°C − +70°C |
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1
S1A0427B01 |
AM/FM 1 CHIP RADIO |
BLOCK DIAGRAM
AM IF |
RF |
AM/FM |
IF |
AFC AGC |
AM/FM |
IF DET |
VCC |
OUTPUT |
GND |
IF INPUT |
BYPASS |
BYPASS IF OUTPUT INPUT |
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4 |
3 |
2 |
1 |
16 |
15 |
14 |
13 |
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AM/FM |
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VOLTAGE |
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REGULATOR |
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IF |
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AM/FM |
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AM F/E |
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DET |
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MIX |
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OSC |
RF |
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POWER |
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AMP |
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5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
AM OSC AM RF |
RF |
AUDIO AUDIO RIPPLE |
AUDIO AUDIO |
INPUT |
BYPASS |
DET OUT POWER REJECTION |
GND POWER OUT |
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)
Character istic |
Symbol |
Value |
Unit |
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Supply Voltage |
VCC |
13 |
V |
Power Dissipation |
PD |
600 |
mW |
Supply Current |
ICC |
44 |
mA |
Thermal Resistance Junction to Ambient |
REJA |
100 |
°C/W |
Operating Temperature |
TOPR |
−20 − +70 |
°C |
Storage Temperature |
TSTG |
−55 − +150 |
°C |
2
AM/FM 1 CHIP RADIO |
S1A0427B01 |
ELECTRICAL CHARACTERISTICS
(Ta =25°C, VCC = 5.5V, fm = 1kHz, AM: f = 1MHz, 30% Mod, FM: f = 10.7MHz f = 22.5kHz, unless otherwise specified)
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Characteristic |
Symbol |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
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Quiescent Circuit |
ICCQ |
SW: FM, Vcc = 3V |
7 |
12 |
17 |
mA |
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Current |
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SW: FM, Vcc = 9V |
10 |
17 |
23 |
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FM |
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Pin 16 Terminal Voltage |
V16(FM) |
SW: FM, Vcc = 9V, VI = 0 |
2.0 |
2.4 |
3.1 |
V |
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-3 dB Limiting Sensitivity |
VI(LIM) |
SW: FM, −3dB |
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57 |
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dB |
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V16 = 2.4V, V R Min |
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Internal Regulated Vtg. |
VCC |
SW: AM, ICC = 42mA |
12 |
13.2 |
14.0 |
V |
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Pin 16 Voltage |
V16 (AM) |
SW: AM, VCC = 9V, VI = 0 |
1.4 |
− |
1.9 |
V |
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AM |
Maximum Sensitivity |
SMAX |
SW: AM, VCC = 12V |
1.5 |
3.0 |
− |
V |
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VI = 37dBμ, RL = 8Ω |
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Signal to Noise Ratio |
S/N |
VI = 37.5dBμ, RL = 8Ω |
15 |
20 |
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dB |
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PO = 50mW |
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Output Power |
PO |
f = 1kHz, THD = 10% |
0.28 |
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W |
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VR Min, RL = 8Ω |
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PWR |
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Total Harmonic |
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ICC = 42mA, RL = 45Ω |
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AMP |
THD |
− |
0.5 |
4.0 |
% |
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Distortion |
f = 1kHz, VO = 2V VR Min |
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Voltage gain |
GV |
f = 1kHz, RL = 8Ω, PO = 50mW |
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41 |
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dB |
3
S1A0427B01 |
AM/FM 1 CHIP RADIO |
TEST CIRCUIT
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V16 |
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VCC |
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T6 |
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C18 |
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1 |
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6 |
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C17 |
C16 |
470pF |
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2 |
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470μ F 0.047μ F |
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3 |
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4 |
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R8 |
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T4 |
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4 |
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3 |
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3 |
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4 |
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1.2kΩ |
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R8 |
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POWER |
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2 |
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2 |
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OUTPUT |
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4.7k |
Ω |
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6 |
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1 |
1 |
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6 |
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C11 |
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RL |
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T5 |
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470μ F |
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C15 |
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GND |
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10pF |
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C13 |
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C11 |
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470μ F |
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FM |
SW |
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C12 |
0.001μ F |
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220μ F |
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AM |
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16 |
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15 |
14 |
13 |
12 |
11 |
10 |
9 |
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R6 |
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S1A0427B01 |
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22kΩ |
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1 |
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2 |
3 |
4 |
5 |
6 |
7 |
8 |
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VR |
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C10 |
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0.022μ F |
100kΩ |
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0.01μ F |
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T2 |
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L1 |
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L2 |
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1 |
6 |
C5 |
C6 |
1 |
6 |
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3 |
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2 |
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51pF |
2 |
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R3 |
2 |
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R5 |
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R2 |
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680pF |
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50Ω |
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(R = |
8 |
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10kΩ |
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3 |
4 |
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3 |
4 |
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6 |
1 |
C8 |
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50pF |
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2pF |
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T3 |
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C7 |
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R4 |
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4 |
1 |
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0.047μ F |
50Ω |
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R1 |
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C3 |
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2 |
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50Ω |
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220pF |
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6 |
3 |
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C4 |
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C19 |
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0.022μ F |
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3.3μ F |
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C2 |
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FM |
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0.022μ F |
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AUDIO |
AUDIO |
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FM IF INPUT |
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AM |
SW |
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AM RF INPUT |
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DET OUTPUT POWER INPUT |
4
AM/FM 1 CHIP RADIO |
S1A0427B01 |
APPLICATION INFORMATION
—EXTERNAL COMPONENTS
Part |
Purpose |
Typical |
Influence |
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Number |
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Smaller Than Typ |
Greater Than Typ |
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R5 |
Am gain Control |
47kΩ |
Low AM gain |
AGC Distortion increase, |
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(33K − ∞ ) |
High gain |
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R7 |
FM detector |
4.7kΩ |
Low detector output, stable IF gain, |
Sharp IF AMP curve |
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damper |
low FM gain |
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R8 |
FM gain adjust |
470Ω |
Low FM gain |
High gain, but noise |
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increase |
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C2 |
IF bypass |
0.022μF |
Should not be less than 0.005μF |
High IF Gain, |
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S/N ratio degrade |
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C4 |
IF filter |
0.022μF |
Removal may cause IF oscillation |
No influence |
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Using over 1 will cause |
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C7 |
AM bypass |
0.047μF |
Low gain |
FM distortion at small |
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signal |
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C9 |
Detector filter |
0.01μF |
Unstable IF AMP oscillation |
Poor FM frequency |
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response |
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C10 |
Audio coupling |
0.022μF |
Lower sensitivity, poor low frequency |
Bass boost affects |
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response |
de-emphasis curve |
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C11 |
Audio Input High- |
0.001μF |
Audio oscillation |
Poor response |
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cut |
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C12 |
Ripple filter |
220μF |
Poor frequency response & Low gain |
Improve AC Hum |
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C13 |
Audio output |
470μF |
Poor low frequency response |
Can achieve optimum |
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coupling |
output power |
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C14 |
Power line filter |
470μF |
Poor AC Hum |
Improve AC Hum |
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C15 |
FM detector |
10pF |
Narrow IF bandwidth |
Wide IF bandwidth |
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phase-shift |
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C16 |
High freq. |
0.047μF |
Removal will cause fm oscillation |
No influence |
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(IF) bypass |
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AN AGC time |
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C17 |
constant and high |
0.047μF |
Charging not recommended |
− |
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frequency (IF) |
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bypass |
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5