3.5.8 function introduction to HS0038A2
Infrared receiver HS0038A2 or HS0038B has three pins: power supply anode (pin 2), power supply
cathode (pin 1) and data output port (pin 3). If 5V is used for power supply, when keeping the state, voltage of
data output port is also 5V (HS0038B requires pull-up resistor). The internal part is composed of infrared
receiving diode and amplification circuit. To reduce the interference of visible light to working, diode part of
infrared receiving usually adopts black resin casing to filter the beam with waveform length below 700nm. The
amplification circuit is composed of an integrated block and elements of resistor and capacitor (including
amplification, frequency selection and demodulator circuit), cased inside a screen-shielded box.
Pin function is shown as the following figure:
Pin
Name
Function
Voltage
Remark
1
GND
Ground
0
2
VCC
Power supply
5.1
3
IR
Remote control data
5.1
When there is remote control signal, voltage of IR signal
changes between 5.1 and 4.1.
3.5.9 function introduction to 4558/4580
4558/4580 includes two integrated operational amplifiers inside, and pin function is shown as the
following table:
Pin
Function
Signal flow
Pin
Function
Signal flow
1
Output of operational amplifier A
O
5
Output of operational amplifier B
O
2
Cathode input of port operational amplifier A
I
6
Cathode input of port operational amplifier B
I
3
Anode input port of operational amplifier A
I
7
Anode input of port operational amplifier B
I
4
minus 9V voltage input
I
8
(+) 9V voltage input
I
3.5.10 function introduction to TDA1308
TDA1308 is a headphone drive chip, and pin function is shown as the following table:
Pin
Name
Function
Signal flow
Pin
Name
Function
Signal flow
1
OUT1
Headphone right
channel output
I
5
IN2+
Reference voltage
input
I (2.3V)
2
IN1-
Right channel
signal input
O
6
IN2-
Left channel signal
input
I
3
IN1+
Reference voltage
input
I (2.3V)
7
OUT2
Headphone left
channel output
O
- 80 -
Содержание DV725SI
Страница 1: ...service manual DV725SI...
Страница 62: ...21 27M clock signal waveform diagram 22 Reset circuit waveform diagram URST Dv33 58...
Страница 95: ...5 1 7 Surface layer of DECODE SERVO Board 91...
Страница 96: ...5 1 8 Bottom layer of DECODE SERVO Board 92...