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KA2161
PAL/NTSC 1 CHIP IC FOR COLOR TELEVISION
PAL/NTSC 1 CHIP FOR C/TV
54-SDIP-600
The KA2161 combines an IF system and a video/chroma/deflection on a monolithic integrated circuit to provide a PAL/NTSC color television. This device is suitable to a muiti-CTV svstem on a 54 SDIP and includes VI F/SIF, videc/chroma/deflection processor.
FUNCTION
IF BLOCK * VIF Amp. * Video detector * 1st, 2nd IF AGC filter * Noise canceller * AFT * RFAGC * SIF limiter Amp. * Attenuator * FM detector * AF AMP VIDEO * Contrast control * Brightness control * Pedestal clamp circuit * Sharpness control using internal D.L * OSD(R,G,B) interface * OSD brightness control CHROMA * * * * * * * * * ACC amplifier demodulator Color control Tint control for NTSC system APC circuit VCO (fsc) Killer detector Matrix circuit PAL/NTSC system SW
ORDERING INFORMATION Device Package Operating Temperature -20C ~+70C
KA2161 54-SDIP-600
DEFLECTION * Sync. seperator * AFC filter * 32th VCO * Horizontal driver * X-ray protecter * 50/60 Hz auto detector * Vertical driver OSD * OSD(R,G,B) interface circuit * OSD brightness control
FEATURE
* * * * * * * Lower operation voltage: VCC=9V Available Multi system (PAL/NTSC/SECAM) with SECAM decoder Minimum number of external parts required Small package type: 54 SDlP Suitable OSD interface Available 50/60 Hz auto switch Built in Delay Line for video sharpness
KA2161
BLOCK DIAGRAM
PAL/NTSC 1 CHIP FOR C/TV
ATT INPUT SOUND N.F INPUT DE-EMPHASIS SIF DET.IN SIF LIMITER OUT AGC FILTER1 AGC FILTER2 VIF/SIF GND VIF INPUT VIF INPUT APC FILTER fsc VXO V/C/D VCC fsc VXO CLAMP FILTER R-Y OUT B-Y OUT G-Y OUT Y OUT X-RAY PROTECT IN FBP IN H OUT AFC FILTER 32th VCO H VCC OSD R IN OSD G IN
1 2 FM DET 3 4 Limiter 5 AGC DET. 6 7 8 DET 9 10 11 12 VCXO 13 14 15 16 DEMO Matrix 17 18 BRIGHT BLK 19 X-ray 20 21 22 AFC DET. 23 24 25 OSD I/F 26 27 Color IF AMP APC DET TINT INV H.V SEP Sharpness CONTRAST LPF LPF 32th VCO H.DRI V.DRI
OSD BRT NF +ATT AFT 90 B/W NC Killer D.L AMP ACC DET ACC AMP D.L LINE RF AGC
54 53 52 51
OSD BRIGHT SOUND OUT RF AGC DELAY RF AGC OUT
50 ATT.CONTROL 49 SIF IN 48 AFT OUT 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 AFT TANK VIF TANK VIF TANK VIF/SIF VCC VIF OUT KILLER FILTER Delayed siganl IN COLOR CONTROL Contrast CONTROL D.L DRIVE V/C/D GND SYNC.SEP.IN CHROMA IN Brightness CONTOL Sharpness CONTROL TINT CONTROL VIDEO IN V OUT V SEP. FILTER OSD B IN
KA2161
PIN CONFIGURATION
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 DESCRIPTION ATT. INPUT SOUND NF INPUT DE-EMPHASIS SIF DET. INPUT SIF LIMTER OUT AGC FILTER 1 AGC FILTER 2 VIF/SIF GROUND VIF INPUT VIF INPUT APC FILTER fsc VCXO V/C/D Vcc fsc VCXO CLAMP FILTER R-Y OUTPUT B-Y OUTPUT G-Y OUTPUT -Y OUTPUT X-RAY PROTECTOR FBP IN HORIZONTAL OUTPUT AFC FILTER 32fH VCO HORIZONTAL VCC OSD R INPUT OSD G INPUT
PAL/NTSC 1 CHIP FOR C/TV
PIN NO 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
DESCRIPTION OSD B INPUT V. SYNC SEP. FILTER VERTICAL OUTPUT VIDEO INPUT TINT CONTROL SHARPNESS CONTROL BRIGHTNESS CONTROL CHROMA INPUT SYNC. SEP. INPUT V/C/D GROUND DELAY LINE DRIVE CONTRAST CONTROL COLOR CONTROL DELAYED SIGNAL INPUT KLLER DET. FILTER VIF OUTPUT VIF/SIF VCC VIF TANK COIL VIF TANK COIL AFT TANK COIL AFT TANK COIL SIF INPUT ATT.CONTROL RF AGC OUTPUT RF AGC DELAY SOUND OUTPUT OSD BRIGHT CONTROL
KA2161
ABSOLUTE MAXIMUM RATINGS (TA=25C)
Characteristic Supply Voltage Supply current Power dissipation Operating Temperature Storage Temperature Symbol VCCmax ICCmax PDmax TOPR TSTG
PAL/NTSC 1 CHIP FOR C/TV
Value 12 175 2.1 -20~+70 -55~+150
Unit V mA W C C
ELECTRICAL CHARACTERISTICS (TA=25C, VCC=9V)
DC CHARACTERISTICS Characteristic Max. total current Total current ATT. input voltage Sound N.F input voltage FM Det. output voltage SIF tank input voltage SIF limiter output voltage IF AGC filter voltage (1) VIF input voltage VIF input voltage VIF Output voltage VIF tank input voltage VIF tank input voltage AFT tank input voltage SIF input voltage Sound output voltage Symbol ICCmax ICC V1 V2 V3 V4 V5 V6 V9 V10 V43 V45 V46 V47 V49 V53 Test Conditions Min 3.3 3.3 3.3 2.7 3.3 7.8 3.6 3.6 4.0 6.1 6.1 2.5 2.5 3.8 Typ 175 135 3.8 3.9 3.8 3.2 3.8 8.5 4.1 4.1 4.5 6.6 6.6 3.0 3.0 4.3 Max 4.5 4.5 4.5 3.7 4.3 4.6 4.6 5.0 7.1 7.1 3.5 3.5 4.8 Unit mA mA V V V V V V V V V V V V V V
KA2161
IF SECTION (VIF, SIF) Characteristic Min. RF AGC voltage Max. RF AGC voltage VIF input sensitivity VIF max input AGC range Video output amplitude Sync. tip level Carrier leakage Black noise clamp level Black noise threshold level White noise clamp level White noise threshold level Max. AFT voltage Min. AFT voltage AFT det. sensitivity FM det. output level Sound distortion AM rejection SIF limiting voltage MAX. attenuation AF amp gain Y input impedance Y input dynamic range Max. video output level Min. video output level Video output drive current Video AC gain Brightness control DC restoration Clamp terminal voltage Contrast control voltage Contrast gain range V-blk pulse output level H-blk pulse output level V-blk pulse width (50Hz) V-blk pulse width (60Hz) Symbol V51h V51l VIS VIM GR VO VSYNC CL VBCI VBTI VWCI VWTI V48h V48l SAFT VO3 THD AMR VILIM GATT GAF YINP YD YMAX YMIN YSINK GY GBRT TDC VCLAMP VCONT GCONT VVBLK VHBLK VPVBLK VNVBLK
PAL/NTSC 1 CHIP FOR C/TV
Test Conditions
Min 8.0 110 60 1.7 2.2 40 3.2 1.5 5.1 3.6 8.0 15 150 30 65 17 11 2.0 6.3 1.3 9 2.0 95 2.8 1.0 12 8.5 8.5 19 14
Typ 40 110 71 2.0 2.4 58 3.6 1.8 5.4 3.9 8.7 0.5 23 230 53 34 80 20 15 3.0 6.8 0.3 2.0 12 3.0 99 3.3 1.25 18 21 16
Max 1.0 45 2.3 2.7 4.0 2.1 5.7 4.2 1.0 30 350 1.0 45 23 20 7.3 0.7 3.0 15 4.0 3.8 1.5 24 23 18
Unit V V dBu dBu dB Vp-p V dB V V V V V V KHz/V mVms % dB dBu dB dB Kohm Vp-p V V mA dB times % V V dB V V H H
KA2161
OSD SECTION Characteristic OSD input on current (R) OSD input on current (B) OSD input on current (G) OSD input off current (R) OSD input off current (B) OSD input off current (g) OSD output high level OSD output low level Output rise time Rise propagation delay Output fall time Fall propagation delay OSD Y S/W time Y OSD S/W time OSD Y S/W delay time Y OSD S/W delay time OSD Y S/W time OSD brightness sensitivly Symbol IONR IONB IONG IOFFR IOFFB IOFFG VH VL TR TFPRO TF TFPRO TOY TYO TDOY TDYO TOY GBS
PAL/NTSC 1 CHIP FOR C/TV
Test Conditions
Min 0.2 0.2 0.2 0.15 0.15 0.15 6.4 4.4 0.5
Typ 0.3 0.3 0.3 0.22 0.22 0.22 6.7 4.7 15 40 15 40 10 10 10 10 10 1
Max 0.4 0.4 0.4 0.3 0.3 0.3 6.9 5.0 100 100 100 100 100 100 100 100 100 1.5
Unit mA mA mA mA mA mA V V nsec nsec nsec nsec nsec nsec nsec nsec nsec times
KA2161
CHROMA SECTION Characteristic ACC characteristic (1) ACC characteristic (2) Uni-color control voltage Uni-color control range Color control voltage Color control range Color residual voltage Tint control voltage Tint range 1(3.58MHz) Tint range 2(3.58MHz) PAL/NTSC S/W voltage Killer sensitivity (3.58MHz) Killer sensitivity (4.43MHz) Killer voltage (1) Killer voltage (2) APC pull in range(3.58MHz) APC pull in range(3.58MHz) APC hold in range(3.58MHz) APC hold in range(3.58MHz) APC pull in range(4.43MHz) APC pull in range(3.58MHz) Symbol A1 A2 VUNI GUNI VCOL GCOL VR VTINT TNTSC1 TNTSC2 VP/N KSN KSP VKIL1 VKIL2 f PN1 f PNH f HN1 f HNH f PP1 f PPH
PAL/NTSC 1 CHIP FOR C/TV
Test Conditions
Min 0.5 0.9 0.8 20 0.8 20 0.8 35 -35 0.4 4.5 3.8 300 300 300 300 300 300
Typ 0.85 1.0 1.2 1.2 1.5 50 -50 0.7 1.0 1.0 4.8 4.1 500 500 500 500 500 500
Max 1.2 1.6 1.6 3. 2.5 1.4 3.0 3.0 5.1 4.4 -
Unit Vp-p ratio V dB V dB mVp-p V deg deg V mVp-p mVp-p V V Hz Hz Hz Hz Hz Hz
KA2161
CHROMA SECTION Characteristic APC hold range(4.43MHz) APC hold range(4.43MHz) Freq. sensitivity(3.58MHz) Freq. sensitivity(4.43MHz) Demo. color out R(NTSC) Demo. color out B(NTSC) Demo. color out G(NTSC) Demo. color out R(PAL) Demo. color out B(PAL) Demo. color out G(PAL) Demo relative amplitude(NSTC) Demo relative amplitude(NSTC) Demo relative amplitude(PAL) Demo relative amplitude(PAL) Demo relative phase(NTSC) Demo relative phase(NTSC) Demo relative phase(PAL) Demo relative phase(PAL) Demo residual carrier R Demo residual carrier G Demo residual carrier B Demo residual harmonic R Demo residual harmonic G Demo residual harmonic B Demo output band width R Demo output band width G Demo output band width B Demo output difference Demo output difference Demo output difference D.L amp characteristic Sweeper amplitude Sweeper amplitude Sweeper amplitude Sweeper period Sweeper period Sweeper period Symbol f HPH f HPL f SENN f SENP VM VBN VGN VRP VBP VGP NR/B NG/B PR/B PG/B NP R/B NP G/B PP R/B PP G/B VRCW VGCW VBCW VRHC VGHC VBHC fR fG fB VCOL1 VCOL2 VCOL3 VDL SV1 SV2 SV3 ST1 ST2 ST3
PAL/NTSC 1 CHIP FOR C/TV
Test Conditions
Min 300 300 0.5 0.5 2.9 3.3 0.9 1.2 2.2 0.7 0.8 0.28 0.43 0.27 100 225 78 226 1.0 1.0 1.0 -0.3 -0.3 -0.3 0.7 4.5 3.5 0.8 60 50 5
Typ 500 500 1.0 1.0 3.6 4.0 1.4 1.8 2.8 1.2 0.9 0.34 0.56 0.34 110 235 90 236 1.8 1.8 1.8 0 0 0 1.3 5.0 4.0 1.0 110 100 10
Max 1.5 1.5 4.7 4.7 1.9 2.4 3.4 1.7 1.1 0.48 0.69 0.46 120 245 96 246 20 20 20 100 100 100 3.0 3.0 3.0 0.3 0.3 0.3 2.1 5.5 4.5 1.4 140 120 15
Unit Hz Hz KHz/V KHz/V Vp-p Vp-p Vp-p Vp-p Vp-p Vp-p ratio ratio ratio ratio deg deg deg deg mVp-p mVp-p mVp-p mVp-p mVp-p mVp-p MHz MHz MHz V V V Vp-p V V V msec msec msec
KA2161
DEFLECTION SECTION Characteristic Sync. sep. sensitivity current H AFC phase det. current 32fH VCO starting voltage H out osc. starting voltage H free running frequency H pull in range H hold range H pulse duty X-ray protector voltage X-ray protector hold voltage H output voltage (H) H output voltage (L) V output duty V output voltage (H) V output voltage (L) V pull in range(50Hz) V pull in range(60Hz) V free running freq(50Hz) V free running freq. (60Hz) 50/60Hz S/W voltage (50) 50/60Hz S/W voltage (60) 50/60Hz S/W voltage (50) 50/60Hz S/W voltage (60) H osc. control sensitivity Phase det. stop period(50) Phase det. stop period(60) Service S/W vert. voltage AFC voltage drift Osc. supply voltage drift 32 f H voltage AFC filter current AFC filter voltage Sync. sep. in voltage Symbol IIN ID VFH VH fH f HPULL f HHOLD TH V20 VH20 VHH VHL TV VVH VVL f VPP1 f VPP2 f VPN1 f VPN2 f VP1 f VN VSP VSN VIP VIN SH TPP1 TPP2 TPN1 TPN2 VSV VD VOSC V24 IAFC V23 V36
PAL/NTSC 1 CHIP FOR C/TV
Test Conditions
Min 10 200 2.0 4.0 15.4 +/-500 +/-500 41 1.1 4.7 9 4.7 52 62 40 49 5.0 2.5 4.5 0.5 2.0 290 3 240 3 4.0 30 6.5 2.2
Typ 20 300 3.0 4.4 15.6 43 1.3 5.0 0 10 5.0 0 60 44 67 53 44 53 6.0 3.0 5.0 1.0 4.0 309 5 259 5 5.0 7. 7.3 2.7
Max Unit 30 A 400 A 4.0 V 5.0 V 15.7 KHz Hz Hz 45 % 1.5 V 1.2 V 5.3 V 0.1 V 11 % 5.3 V 0.1 V Hz 49 Hz Hz 58 Hz 48 Hz 58 Hz 6.5 V 3.5 V 5.5 V 1.5 V 6.0 Hz/mV Hz Hz Hz Hz 0.5 Vp-p +/-0.6 V 3 % +/6.0 V 140 A 8.0 V 3.2 V
KA2161
PIN DESCRIPTION
PIN NO. 1 FUNCTION ATT. IN. DESCRIPTION Detected audio signals provided to ATT. Amp
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
1
2
SOUND N.F IN
AC and DC feedback audio signals from power amp are supplied to A.F amp
2 from ATT.
3
SOUND De-emphasis
The external capacitor eliminates high frequency components in F.M det.
3 FM DET.
4
SIF Det.IN
Connected SIF tank coil. The SIF limitting signal is supplied from SIF limiter (PIN 5).
4
KA2161
PIN DESCRIPTION
PIN No. 5 FUNCTION SIF limiter OUT DESCRIPTION
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
The limiting SIF signal is taken from limiter AMP.
Limiter AMP 5
6 7
AGC filter 1 AGC filter 2
Connected external resistors, capacitors. Dual time constant improve high speed AGC time speed in TV.
7 6
8 9 10
VIF/SIF GND VIF/SIF GROUND IF IN IF input terminals provide IF output signals to IF AMP stage in differential AMP.
5 10
KA2161
PIN DESCRIPTION
PIN No. 11 FUNCTION APC. filter DESCRIPTION The APC filter terminal is connected external R,C The APC functions filtering AC signals and provide error voltage to fsc VCO block.
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
11
12 14
fsc VCO fsc VCO
The fsc VCO is connected X-tal.
14
12
13 15
V/C/D GND Video/Chroma/Deflection GROUND CLAMP The clamp filter terminal is filter connected capacitor. Using clamp circuit, pedestal level of video signal is clamped.
15
KA2161
PIN DESCRIPTION
PIN No. 16 17 18 FUNCTION R-Y OUT B-Y OUT G-Y OUT DESCRIPTION Color output terminals for color differential signal.
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
Demodulator
19
-Y OUT
Terminal for -Y signal.
19
20
X-RAY protect IN
Terminal for X-ray protect turns on 1.4V Detected over voltage in CRT, X-ray protect stops oscillating the Hori. out
20
21
FBP IN
Terminal for FBP input FBP signals are supplied from FBT. In order to synchronize Hori. scanning, The AFC compares Hori. sync with FBP signals.
21
KA2161
PIN DESCRIPTION
PIN No. FUNCTION 22 Hori. OUT DESCRIPTION Terminal for Hori. output
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
22
23
AFC filter
The AFC filter terminal is connected external R,C for low pass filter. AFC voltage provides error voltage to 32 fH VCO block.
23
To VCO
24
32fh VCO
This terminal is connected the 503 kHz resonator.
24
25 26 27 28
Hori. VCC OSD R IN OSD G IN OSD B IN
Hori. supply voltage is 9V. Terminal for OSD input OSD input signals are supplied from micro-controller,etc. It is suitable to interfacing OSD.
To demodulator
KA2161
PIN DESCRIPTION
PIN No. 29 FUNCTION DESCRIPTION
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
Vert. separate Terminal for vert. separate filter filter is connected with external capacitor.
29
30
Vert. OUT
Vert. output pulses provide vert. AMP block for driving D.Y coil.
30
31
VIDEO IN
Terminal for video signal input
31
32
Sharpness control
Using the external variable resistor, sharpness of video signals are changed for emphasis high freq. of video signals.
32
KA2161
PIN DESCRIPTION
PIN No. 33 FUNCTION Tint control & PAL/NTSC SW DESCRIPTION Using the external variable resistor, tint of color are changed in NTSC system only
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
33
34
Brightness control
Terminal for brightness control.
34
35
Chroma IN
Chroma signals are supplied from composite video signals using B.P.F
35
36
Sync.separate Sync. signals are taken from IN composite video signals using L.P.F.
36
37
V/C/C GND
Video/Chroma/Deflection GROUND
KA2161
PIN DESCRIPTION
PIN No. 38 FUNCTION Delay Line drive OUT DESCRIPTION Terminal for output of D.L AMP for 1 H delaye line.
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
38
39
Contrast Control
Using the external variable resistor, contrast control is changed for controlled video/ color output level.
39
40
Color Control
Using the external variable resistor, color is changed for controlled color output level.
40
41
Delayed signal INPUT & 50/60 Hz forced S/W
Through the 1 H delay line chroma signals provide to demodulator block. And we can forcely select 50Hz: 3.0V 60Hz: 6.0V
41
KA2161
PIN DESCRIPTION
PIN No. 42 FUNCTION Killer DET. filler DESCRIPTION Terminal for killer detect filler. In case of no color signals or low RF input signals, Killer det. operates to kill the color process.
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
42
43
VIF DET. OUT
Terminal for output of VIF DET.
43
44 45 46
VIF/SIF VCC VIF tank coil
Supply voltage is 9V. Connected VIF tank coil between PIN 45 and PIN 46. VIF detector is quadurature detecting system using tank coil.
45
46
47
AFT tank coil
Terminal for AFT tank coil If this pin is connected 100 Uto ground, we defeat AFT function.
47
KA2161
PIN DESCRIPTION
PIN No. 48 FUNCTION AFT OUT DESCRIPTION Terminal for AFT output
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
48
49
SIF IN
SIF signals provide to this terminal.
49
50
ATT. control
Attenuation of sound output changes the external variable resistor
50
51
RF AGC OUT
RF AGC OUT terminal feeds output voltage to tuner in order to improve AGC range This terminal is connected a pull-up resistor to Vcc. (open collector)
51
KA2161
PIN DESCRIPTION
PIN No. 52 FUNCTION RF AGC delay control DESCRIPTION RF AGC delay control terminal is connected to external variable resistor. Using thr esternal variable resistor, RF AGC OUT delay point is changed for fitting the tuner characteristics.
PAL/NTSC 1 CHIP FOR C/TV
EQUIVALENT CIRCUIT
52
53
Sound OUT
Sound OUT terminal. Sound signals are provided to sound power AMP.
53
54
SOD brightness control
OSD brightness control terminal
54
KA2161
APPLICATION CIRCUIT
PAL/NTSC 1 CHIP FOR C/TV
AFT OUT
Vcc(9V) 10K O
10K 10K O
2.2 i F 4.7 i F
+
1 2 3
ATT IN Sound IN De-emp. SIF DET. IN LIMITER OUT AGC 1 AGC 2
OSD Bright Sound OUT RF AGC delay RF AGC out
54 53 52 51
SOUND OUT 103 10K O
+
152
103
4
7pF 683
2.2 i F
68K O
+
ATT. 50
103
10K O
5 6 7
SIF IN
49
103
103
5.1K O 10K O 91K O
47 i F
+
AFT OUT 48
22
220 220 O
8
103 IF INPUT SAW 333 1.5K 1.5K O 2.7K 2.7K O 103
IF GND VIF IN VIF IN APC filter fsc VCO V/C/D Vcc fsc VCo CLAMP R-Y B-Y G-Y -Y X-RAY IN FBP IN H-OUT AFC filter 32fH VCO H Vcc OSD R OSD G
AFT tank VIF tank VIF tank IF Vcc VIF OUT Killer
47 46 45
6.2K 6.2K O
1K O 103 10K O
10K O
9 10 11 12
103 33pF
10 i F
3K 3K O 1.5K O
2.2 i F
+
44 43 42
473 560 560 O 103 150 O 8.2 i H 103
+
10K O
13
X-TAL 2.7K 2.7K O
14
33pF
D.L IN Color Contrast
41
103
10K 10K O 103 1K 1K O 1.6KO 1.6K
+
100 O
15 16 17
40
1H D.L
39
13iH 103
10KO 10K
5.1KO 5.1K
D.L out V/C/D GND SYNC.IN Chroma IN Bright Sharpness TINT VIDEO IN V OUT V SEPA OSD B
38
1K 1K O
D.L
100 O
18
100 O
37 36
103
0.47 i H (N.P)
1.6K O
19
320 O 104 510K O 10K O
15 i H
2K 2K O
10K 10K O 103
20
10K O
35
101 68p
21
10K O 390 O 430 O
34
1K 1K O
22 23 24 25 26 27
33
10K 10K O
10K O
10K O 3.3K O
2.2 i F
+
103
32
0.47 i F
10 i F CSG500F40 200 OCSG500F40
31 30
103
+
TO Vert. amp
+
HORI. Vcc(9v) 103
0.47 iF
29
+
28
10K O

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