Pin Details of IC LA7250

Pin Details of IC LA7250

Substitute : KA7520

Functions :

  1. Video IF
  2. Video detector & Video pre-amplifier
  3. Soud IF amplifier & limiter
  4. Discriminator & audio pre-amplifier
  5. AFT & automatic gain control amplifier
  6. Sound mute circuit

Pin

No.

FUNCTION
Voltage
1.
FM discriminator(5.5MHz)crystal
4.8
2.
Audio frequency output from FM detector
5.2
3.
Audio signal input to attenuator(DC volume control)
2.8
4.
Negative feedback (output to input)for audio amplifier
4.2
5.
Audio frequency output from audio driver amplifier
4.8
6.
Ground(-Ve supply voltage)
0
7.
Mute circuit (sound)
4.6
8.
Decoupling capacitor for quality improvement
4.4
9.
Video IF signal input
4.4
10.
Video IF signal input
4.4
11.
Decoupling capacitor for quality improvement
4.4
12.
RF-AGC delay control
2.1
13.
RF-AGC control voltage for tuner (delayed AGC control)
9.6
14.
Mute circuit (for sound seaction)
4.6
15.
Video IF signal input
3.8
16.
Video IF signal input
3.8
17.
AFT oscilator signal output for horizontal osc.(15625Hz)
8.9
18.

Frequency tuning circuit for automatic

frequency tuning AFT amplifier

3.8
19.
Video detector frequency tuning circuit
4.2
20.
Video detector frequency tuning circuit
9.3
21.

Frequency tuning circuit for automatic

frequency tuning AFT amplifier

4.2
22.
Composite chroma (colour)video signal output
4.9
23.
Positive(+Ve)supply voltage for video seaction
12.9
24.
Regulated supply voltage for sound seaction
12.2
25.
Sound IF signal output from sound IF detector
12.3
26.
Decoupling capacitor for biasing of sound IF amplifier
3.1
27.
5.5MHz. inter carrier sound signal input
3.1
28.
5.5MHz. inter carrier sound signal input to FM detector
3.1
29.
Mute circuit ( sound )
0.1
30.
FM detector
5.6




 
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