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Sonar Ranging Module
SRM400
Electronic Circuit Diagram
Test "B"
Vcc
Vref
Test "E"
Vcc
Test "D"
Vref
Test "F"
Test "C"
Vref
Vref
Vref
Vcc
Vreg
Vcc
Vref
Test "A"
High Level Pulse
Echo
IFT
1
3
2
4
MMBT3904
2.7K
13K
10n
1K
680p
6.8K
Ultrasonic Transducer
2200p
33K
1
2
3
1
2
3
100u
22p
680p
100
20K
BSS123
1
2
3
220u
4.7K
47K
BAV99
10K
100u
100u
10n
BAV99
4.7K
470p
400EP14D
14
17
PW0268
7
2200p
9
13
MCU
3
2
15
16
10
18
511
19
11
1.5K
3.3K
8
5
660KHZ
1
12
4
20
6
User
Side
Signals at different test points:
works with transducer model 400EP18A against a hard target of size of 20cmL*20cmW*1cmT at distance of 50cm
“A” Point: Control Pulse (from MCU)
“B” Point: Tone bursts Signal
H: 0.5ms/div
V: 5V/div
H: 0.5ms/div
V: 5V/div
“C” Point: Transducer loading
“D” Point: 1
st Pre-Amplifier
H: 0.5ms/div
V: 50V/div
H: 0.5ms/div
V: 20mV/div
“E” Point: Main 32 Steps TCG Amplifier
“F” Point: Digital Echo signal Output
H: 0.5ms/div
V: 1V/div
H: 0.5ms/div
V: 5V/div
Refer to PW-0268 Sonar Ranging IC for detail information.
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