Detailed view Modules (units)
Mains rectifier 8222 280 2097.3
Supply control With TDA2581q (PHILIPS) 8222 280 2089.6
IF DEM Unit with TDA2540q (PHILIPS) 3122 128 80281 8222 280 2109.4
Synch with TDA2571AQ (PHILIPS) 8222 280 2105.4
Lum + Chrom with TDA 2525Q AND TDA2560/3Q + Delay Line DL 700. 8222 280 2093.3
RGB OUTPUT 8222 280 2101.4
SOUND With TBA120AS 8222 280 2082.6
TBA120T (Siemens) SIF (S
PHILIPS 20C939 Chassis KT30 detailed view.
Supply + line + EHT Stages
Focus + G2 + E/W Correction - FRAME Deflection.
Signal Stages (Chroma + Luma + Sound + RGB + Synch + IF + RF Tuner)
Line deflection output transistor (BU208A)
TDA2581 CONTROL CIRCUIT FOR SMPS
The TDA2581 is a monolithic integrated circuit for controlling switched-mode power supplies (SMPS) which are provided with the drive for the horizontal deflection stage.
The circuit features the following:
— Voltage controlled horizontal oscillator.
— Phase detector.
— Duty factor control for the positive-going transient of the output signal.
— Duty factor increases from zero to its normal operation value.
— Adjustable maximum duty factor.
- Over-voltage and over-current protection with automatic re-start after switch-off.
— Counting circuit for permanent switch-off when n~times over~current or over-voltage is sensed
-Protection for open-reference voltage.
- Protection for too low supply voltage.
Protection against loop faults.
Positive tracking of duty factor and feedback voltage when the feedback voltage is smaller than the
reference voltage minus 1,5 V.
TDA2540 IF AMPLIFIER WITH DEMODULATOR AND AFC
DESCRIPTION
The TDA2540 and 2541 are IF amplifier and A.M.
demodulator circuits for colour and black and white
televisionreceiversusingPNPorNPNtuners. They
are intended for reception of negative or positive
modulation CCIR standard.
They incorporate the following functions : .Gain controlled amplifier .Synchronous demodulator .White spot inverter .Video preamplifier with noise protection .Switchable AFC .AGC with noise gating .Tuner AGC output (NPN tuner for 2540)-(PNP
tuner for 2541) .VCR switch for video output inhibition (VCR
play back)
.SUPPLYVOLTAGE : 12V TYP
.SUPPLYCURRENT : 50mATYP .I.F.
INPUT VOLTAGE SENSITIVITY AT
F = 38.9MHz : 85mVRMS TYP
.VIDEO OUTPUT VOLTAGE (white at 10% of
top synchro) : 2.7VPP TYP .I.F. VOLTAGE GAIN CONTROL RANGE :
64dB TYP
.SIGNAL TO NOISE RATIO AT VI = 10mV :
58dB TYP .A.F.C. OUTPUT VOLTAGE SWING FOR
Df = 100kHz : 10V TYP
The left positioned board contains all search tuning functions and it's based on a complex ASIC Ic called SONG IC which is followed by a vertical little unit in the near of it which contains the two SONG II ICS which also are the tuning memory supplyied by a NiCd battery.
The board contains even additional complex funcions realized via discrete components such analog functions - stby startup via remote - automatic search.
You can see the complexity of the tellye even only from the wiring around it.
BU208(A)
Silicon NPNnpn transistors,pnp transistors,transistors
Category: NPN Transistor, Transistor
MHz: <1 MHz
Amps: 5A
Volts: 1500V
HIGH VOLTAGE CAPABILITY
JEDEC TO-3 METAL CASE.
DESCRIPTION
The BU208A, BU508A and BU508AFI are
manufactured using Multiepitaxial Mesa
technology for cost-effective high performance
and use a Hollow Emitter structure to enhance
switching speeds.
APPLICATIONS:
* HORIZONTAL DEFLECTION FOR COLOUR TV With 110° or even 90° degree of deflection angle.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VCES Collector-Emit ter Voltage (VBE = 0) 1500 V
VCEO Collector-Emit ter Voltage (IB = 0) 700 V
VEBO Emitter-Base Voltage (IC = 0) 10 V
IC Collector Current 8 A
ICM Collector Peak Current (tp < 5 ms) 15 A
TO - 3 TO - 218 ISOWATT218
Ptot Total Dissipation at Tc = 25 oC 150 125 50 W
Tstg Storage Temperature -65 to 175 -65 to 150 -65 to 150 oC
Tj Max. Operating Junction Temperature 175 150 150 °C
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