Download Portable Solar Modules

projects
instrumentation
+5V
P1.A
RE1.B
1
2p5...
35p
C22
220p
2n2
7
C7
R1
27p
RE4.B
4k7
IC1
-5V
R17
11
C9
1n
7
+5V
R8
470k
-5V
R14
T1 =
1k
C23
Amplifier: Vu = 8 (18.06dB)
5
PMBFJ620
22n
IC1.A
6
T1.B
IC4
7 10
9
2
IC1.B
8 12
IC1.C
13
14
R7
3
10k
R18
47 Ω
+5V
RE3.A
RE4.A
3
3
5
K4
5
5
D2
C5
BAS45
10n
R3
5
4
K2
8
OUTPUT
FREQUENCY
1µ
27 Ω
RE2.A
3
6
7
C14
IC1 = ADA4862-3
RE1.A
1
LT1016
4k7
R2
3
10k
R10
4
R13
1
+5V
47 Ω
100k
7
OFFSET
COMPARATOR
R11
4k7
IMPEDANCE CONVERTER
(high to low)
T1.A
R5
R6
RE3.B
1
+5V
P1.B
C8
10n
10k
R4
27 Ω
10n
9k
C25
BAS45
R12
C21
220p
1M Ω/22p
RE2.B
90k
K3
C6
4k7
2p5...
35p
D1
900k
C20
C24
7
47 Ω
1
R9
+2V5
-5V
5
7
4
+5V
3
2
+2V5
-5V
1
2
430 Ω
MEASUREMENT RANGES
MB1 ... MB4
RE1 ... RE4 = SIL7172-L-5V
K5
C1
C3
C12
C13
C16
C17
100n
4µ7
4µ7
100n
100n
10µ
C2
C4
C10
C11
C19
C18
100n
4µ7
4µ7
100n
R15
100n
10µ
POWER SUPPLY
± 5V
5
IN1
IC3 VOUT
LTC1968
8
6
EN
CMS8 RTN
3
R16
IN2
K1
C15
D3
1
DC-RMS
10µ
2V7
D4
-2V5
2V7
430 Ω
080331 - 11
-5V
-2V5
Figure 2. Circuit diagram of the amplifier module, including voltage divider, amplifier and RMS-to-DC converter.
R5
C6
R4
RE3
R10
C22
C21
C23
1
C1
C8
D1
IC1
C10
C11
1
C12
R18
C13 R8
1 R17
C20
C3
C14
P1
R7
©Elektor
080331-1
V1.0
K3
1
R9
C24
R12
R14
R6
C4
R16
R13
C25
RE1
D2
K2
T1
C2
IC4
COMPONENT LIST
RE2
RE4
C5
C16
C17
R11
C7
R3
IC3
1
1
C19
C15
K1
C9
R2
R1
K5
C18
D3
K4
1
R15
D4
Measurement
Amplifier
Resistors
R1,R2, R5 = 47Ω (SMD 0805)
R3,R4 = 27Ω (SMD 0805)
R6 = 100kΩ
R7 = 10k (SMD 0805)
R8 = 470kΩ (SMD 0805)
R9 = 900kΩ 0.1%
R10,R11 = 4kΩ7
R12 = 90kΩ 0.1%
R13 = 9kΩ 0.1%
R14 = 1kΩ 0.1%
R15 = 430Ω (SMD 0805)
R16 = 430Ω (SMD 1206)
R17 = 4kΩ7 (SMD 0805)
R18 = 4kΩ7 (SMD 0805)
Figure 3. Printed circuit board for the amplifier.
28
elektor - 6/2009