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DT-100 PARTS LIST
Resistors 5% 1/4W
Qty.
Symbol
Value
Color Code
1
R14
100W
brown-black-brown-gold
2
R5, R6
220W
red-red-brown-gold
2
R1, R10
330W
orange-orange-brown-gold
1
R13
1kW
brown-black-red-gold
1
R7
5.6kW
green-blue-red-gold
1
R12
10kW
brown-black-orange-gold
1
R8
18kW
brown-gray-orange-gold
2
R2, R3
33kW
orange-orange-orange-gold
1
R9
47kW
yellow-violet-orange-gold
1
R11
100kW
brown-black-yellow-gold
1
R4
330kW
orange-orange-yellow-gold
1
R15
100kW
Variable Potentiometer
Capacitors
Qty.
Symbol
Value
1
C6
0.001mF (102)
3
C2, C3, C5
0.01mF (103)
2
C1, C4
10mF
Semiconductors
Qty.
Symbol
Value
1
D1
1N4001
1
Q5
MPS A70
4
Q1 - Q4
2N3904
1
IC1
555
5
L1 - L5
Miscellaneous
Qty.
Description
Part #
1
PC Board
511100
1
Switch Push Button
540001
2
Switch DPDT
541111
1
Battery Snap
590098
1
Panel Front
614100
1
Knob
622009
1
Case
623240
5
Spacer LED
624111
4
Screw 4-40 x 1/4"
641430
1
Nut Pot 7mm
644101
1
Flat Washer
645101
4
Nut 4-40
644400
Description
Discap
Discap
Lytic
Description
Diode
Transistor
Transistor
Integrated Circuit
Light Emitting Diode
Qty.
Description
1
Lockwasher 5/16" Int.
1
Socket 8-Pin IC
1
Transistor Socket
1
Clip Black
1
Clip Red
1
Clip Green
1
Clip Yellow
1
Wire Black 20 ga.
1
Wire Red 20 ga.
1
Wire Yellow 20 ga.
1
Wire Green 20 ga.
1
Wire Blue Solid 22 ga. 814620
-5-
OPERATING INSTRUCTIONS
The DT-100 is a dynamic transistor and diode tester. It features in-
circuit testing and polarity indicators for both transistors and
Part #
diodes. To activate the DT-100, remove the four front mounting
131000
screws and install a fresh 9V battery.
132200
133300
141000
Diode Testing
145600
151000
1. Place the switch in the diode position.
151800
153300
2. Connect the diode to the red and black leads.
154700
161000
3. Push in the test switch. One diode LED should blink and identify
163300
192611
whether the cathode or anode is connected to the diode (red) lead.
4. If both LED lamps blink, then the diode is shorted.
Part #
231036
5. If neither LED lamps light, then the diode is open.
241031
271045
Transistor Mode:
Part #
314001
The DT-100 can measure transistors in or out of circuit. It will
320070
identify NPN or PNP by a simple adjustment.
323904
330555
Transistor Testing - Out of Circuit
350002
1. Place the switch in the transistor position.
Part #
2. Place the transistor in the socket or attach it to the C, B, and E
646101
664008
leads.
664500
680001
3. Push in the test button. Adjust the base current control so that
680002
the OK LED lights up. This indicates a good transistor.
680003
680004
4. If the OK lamp doesn't light, adjust the base current control so
813110
813210
that either the NP or PN LED lights up. This happens at the
813410
minimum or maximum position of the control setting. This will
813510
indicate transistor type. Place the switch to the NPN position if
the NP lamp lights up, or place the switch to the PNP position if
the PN lamp is lit.
5. If no lamps light up, then the transistor is open or we have not
identified the base lead. Repeat assuming another lead at the
base.
-2-
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