1 Circuit Makeup
.................................................................................................
Block Diagram...................................................................................................
2 Power Supply Circuit
........................................................................................
3 Input Circuit
.....................................................................................................
4 Volume, Tone and Balance Adjusting Circuits
...................................................
5 Microphone Circuits
.........................................................................................
5.1 Working Principle of the Front Processing Section..............................................
5.2 Working Principle of the Echo Processing Section...............................................
6 Front Panel Control and Display Circuits
..........................................................
6.1 Input Control Section........................................................................................
6.2 Channel and MIC Delay Section.........................................................................
6.2.1 Channel Selection Section.............................................................................
6.2.2 The MIC Delay Selection Section....................................................................
6.3 The Spectrum Analysis Section.........................................................................
7 Power Amplification and Protection Circuits
....................................................
7.1 Power Amplification Section..............................................................................
7.2 Protection Circuit.............................................................................................
7.2.1 Delay Switch-on Protection Circuit..................................................................
7.2.2 Midpoint Over-voltage Circuit.........................................................................
7.2.3 Short Circuit Over-current Protection..............................................................
7.3 Multi-channel Control Circuit............................................................................
8 Detailed Circuit Explanations
...........................................................................
8.1 The Power Amplifying Board.............................................................................
8.1.1 Main Parts List of The Matin Power Amplifying Board........................................
8.1.2 Schematic Diagram Of The Main Amplifying Board...........................................
8.2 Front Panel's Control Board..............................................................................
8.2.1 Main Parts List of The Front Panel's Control Board...........................................
8.2.2 Schematic Diagram of The Front Panel's Control Board....................................
8.3 Potentiometer Board........................................................................................
8.3.1 Main Parts List of The Potentiometer Board.....................................................
8.3.2 Schematic Diagram of The Potentiometer........................................................
9 The Explanation For Key Components
.............................................................
CONTENTS
1
2
3
4
5
6
6
6
7
7
9
10
10
11
12
13
13
14
14
15
15
16
16
16
18
19
19
22
24
24
25
26
- 27 -
NAME OF PINS
I/O
DESCRIPTION
NUMBER OF PINS
VDD
P
DIGITAL POWER INPUT
1
XI N
I
OSCILLATOR INPUT
2
XOUT
O
OSCILLATOR OUTPUT
3
D1/ REQ
I
SIMPLE MODE: D1 DATA INPUT
MICRO CONTROL MODE: DEMAND
SIGNAL
4
D2/ SCK
I
SIMPLE MODE: D2 DATA INPUT
MICRO CONTROL MODE: TIME
PULSE INPUT
5
D3/ DATA
I
SIMPLE MODE: D3 DATA INPUT
MICRO CONTROL MODE: DATA INPUT
6
D4/ I DSW
I
SIMPLE MODE: D4 DATA INPUT
MICRO
CONTROL
MODE:
IDENTIFYING CODE INPUT
7
TEST
I
EXCLUSIVELY FOR THE TEST. BE
GROUNDED WHEN IN DAILY USE.
8
EASY/ U- COM
I
HIGH POTENTIAL
£ º
SIMPLE MODE
LOW POTENTIAL: MICRO CONTROL
MODE
9
SLEEP
I
HIGH POTENTIAL
£ º
SLEEP MODE
LOW POTENTIAL: NORMAL MODE
10
D- GND
G
DIGITAL
11
A- GND
G
ANALOG
12
LPF2 OUT
O
LOW PASS FILTER 2 OUTPUT
13
LPF2 I N
I
LOW PASS FILTER 2 INPUT
14
OP2 OUT
O
INTEGRATOR 2 OUTPUT
15
OP2 IN
I
INTEGRATOR 2 INPUT
16
CC2
\
CURRENT CONTROL 2
17
CC1
\
CURRENT CONTROL 1
18
REF
\
ANALOG REFERENCE VOLTAGE
£ ¨
=1/ 2Vcc£ ©
19
OP1 I N
I
IN INTEGRATOR 1 INPUT
20
OP1 OUT
I
INTEGRATOR 1 OUTPUT
21
LPF1 OUT
\
LOW PASS FILTER 1 OUTPUT
22
LPF1 I N
O
LOW PASS FILTER 1 INPUT
23
Vcc
P
ANALOG POWER INPUT
24
FUNCTIONS OF THE PINS