Capacitance and transistor testing circuit – Elenco 3 1/2 Digit Cap. / Trans. Kit User Manual
Page 20
-16-
PARTS LIST - SECTION C
RESISTORS
Qty.
Symbol
Description
Color Code
Part #
r
1
R38
1.87k
Ω
1% 1/4W
brown-gray-violet-brown-brown
141830
r
1
R37
3k
Ω
1% 1/4W
orange-black-black-brown-brown
143030
r
1
R39
6.8k
Ω
5% 1/4W
blue-gray-red-gold
146800
r
1
R34
100k
Ω
5% 1/4W
brown-black-yellow-brown
161000
r
2
R35, R36
100k
Ω
1% 1/4W
brown-black-black-orange-brown
161030
r
1
VR2
200
Ω
Trim Pot
191320
Note:
Resistor tolerance (last band) of 5-band resistors may be blue instead of green.
CAPACITORS
Qty.
Symbol
Value
Description
Part #
r
1
C7
470pF (471)
Disc
224717
r
1
C10
.33
μ
F (334)
Mylar (small yellow)
253318L
r
2
C8, C9
4.7
μ
F
Electrolytic (Lytic)
264747S
r
1
C11
10
μ
F Electrolytic
(Lytic)
271015S
SEMICONDUCTORS
Qty.
Symbol
Value
Description
Part #
r
3
D3 - D5
1N4148
Diode (glass)
314148
r
1
IC2
LM324
Op-Amp
330324
MISCELLANEOUS
Qty.
Symbol
Value
Description
Part #
r
1
IC Socket 14-pin
664014
SECTION C
AC Voltage & Current Circuit
ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD
Bottom Legend Side
R37 - 3k
Ω
1% 1/4W Res.
(orange-blk-blk-brn-brn)
(see Figure I)
D4 - 1N4148 Diode
D5 - 1N4148 Diode
(see Figure L)
C8 - 4.7
μ
F Lytic Capacitor
(see Figure B)
C10 - .33
μ
F (334) Mylar Cap.
(may be marked 334)
D3 - 1N4148 Diode
(see Figure L)
C7 - 470pF (471) Discap
Figure L
Stand diode on
end. Mount with
band as shown on
the top legend.
R38 - 1.87k
Ω
1% 1/4W Res.
(brn-gray-violet-brn-brn)
(see Figure I)
C9 - 4.7
μ
F Lytic Capacitor
(see Figure B)
R35 - 100k
Ω
1% 1/4W Res.
(brown-blk-blk-orange-brown)
(see Figure I)
R36 - 100k
Ω
1% 1/4W Res.
(brown-blk-blk-orange-brown)
(see Figure I)
D3
D5
D4
Assembled View
-19-
PARTS LIST - SECTION E
RESISTORS
Qty.
Symbol
Description
Color Code
Part #
r
1
R29
10
Ω
1% 1/4W
brown-black-black-gold-brown
121030
r
1
R28
90
Ω
1% 1/4W
white-black-black-gold-brown
129030
r
1
R45
150
Ω
1% 1/4W
brown-green-black-black-brown
131530
r
1
R27
900
Ω
1% 1/4W
white-black-black-black-brown
139030
r
1
R42
1.91k
Ω
1% 1/4W
brown-white-brown-brown-brown
141930
r
1
R43
4.3k
Ω
1% 1/4W
yellow-orange-black-brown-brown
144330
r
1
R26
9k
Ω
1% 1/4W
white-black-black-brown-brown
149030
r
1
R44
10k
Ω
1% 1/4W
brown-black-black-red-brown
151030
r
1
R47
11k
Ω
1% 1/4W
brown-brown-black-red-brown
151130
r
2
R40, R41
39k
Ω
1% 1/4W
orange-white-black-red-brown
153930
r
1
R46
76.8k
Ω
1% 1/4W
violet-blue-gray-red-brown
157630
r
1
R25
90k
Ω
1% 1/4W
white-black-black-red-brown
159030
r
1
R48
160k
Ω
1% 1/4W
brown-blue-black-orange-brown
161630
r
2
R49, R50
220k
Ω
5% 1/4W
red-red-yellow-gold
162200
r
1
R24
900k
Ω
1% 1/4W
white-black-black-orange-brown
169030
r
1
VR3
200
Ω
(201)
Trim Pot
191320
Note:
Resistor tolerance (last band) of 5-band resistors may be green instead of brown.
CAPACITORS
Qty.
Symbol
Value
Description
Part #
r
4
C12 - C15
.01
μ
F (103)
Mylar (large brown)
241017L
SEMICONDUCTORS
Qty.
Symbol
Value
Description
Part #
r
4
D6 - D9
1N4001
Diode
314001
r
1
IC3
LM324
Op-Amp
330324
MISCELLANEOUS
Qty.
Symbol
Value
Description
Part #
r
1
IC Socket 14-pin
664014
r
2
h
FE
Socket
664015
SECTION E
Capacitance and Transistor Testing Circuit
r
Attach the LCD to the PC board using the two 2.5
x 8mm screws. Use the top-mounting hole and
lightly tighten the screws. The screws will be
removed to assemble the next section.
Testing Procedure
1. Place the top label over the knob and turn the
range selector knob to an OHM scale position.
2. Connect the 9V battery to the battery snap.
3. Connect the test leads (red lead to V
Ω
CAP and
black to COM). Turn the meter on by pressing the
power switch.
4. Test the Ohms, Buzzer, and Diode functions
using the procedures below.
OHMs
- Using two or three different value resistors,
check each scale. Compare the kit meter readings
with another meter of known accuracy. If the tests
are not working, check the solder of the PTC.
Buzzer
- Set the selector knob to the Buzzer ( )
position. Short the red and black leads and the
buzzer should sound. If the buzzer does not sound,
check components R51-R58, PTC, C16, C17, and
the solder connections to the buzzer.
Diode
- Connect a diode to the test leads with the
correct polarity (see figure below). The meter will
range for 100 - 950.
5. Turn the meter off and remove the battery, top
label, and test leads.
6. Remove two display mounting screws and
display by unscrewing the two mounting screws.
DO NOT PROCEED TO SECTION E WITHOUT INSTRUCTOR’S APPROVAL.
COM
V
Ω