Pin Details of IC LA7521

Pin Details of IC LA7521

Functions :

  1. Video IF amplifier
  2. Video detector & Video pre-amplifier
  3. Sound 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 section)
4.6
15.
Video signal output
3.8
16.
Video signal output
3.8
17.
AFT oscillator signal output for horizontal oscillator(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 section
12.9
24.
Regulated supply voltage for sound section
12.9
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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