esr schematic 052514
Post on 05-Oct-2015
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-
81 2 3 4
V+
V -+A
7 6 5
B +TL082
8
1 2 3 4
V+
V -+A
7 6 5
B +TL082
U 1
C11 uF
R 110 K
C21 uF
R 210 K
R 18120 D 5
- 4.5
9 V DC
BT 1+
+ +
+ 4.5 - 4.5
+ 4.5
- 4.5
+ 4.5
+ 4.5
U 2+ 4.5
R131K
RED BLACKTest Leads
ESR QST April 14 - by KG4BZW
R1427K
R91K
R81K
R1022
R1122
D 1
D 2
R747K
Q1
R627K
R510K
R3 *2.4K
R410K C3
0.001
R121K
R1527K
R1915K R20
81
Q23904
+C6
1 uF
D6
M1100 uA
R175K
D4 1N4418
D3C5
1 uF+
R1647K
C40.1104
S1
KB4_ESR_01.cdd - 05-24-14
Split Rail Supply
100 KHz Oscillator
Comparator / Amplifier
Precision Rectifier
Capacit or Shorted / Leaky Indicator
with test leads shorted meter reads full scale (0 ohm)with test lead open meter reads 0 uA ( )
E B C
Q1 - 3906
E B C
Q2 - 3904
R3 * 2 .7 K - 86.5 KHz 2.2 K - 96.3 KHz
R10 & 11 matched
TP
NOTE: use 10K pot (R17) wit h 50 uA meter and 2.2K R3 (GNX version)
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