Elenco Electronics DT-100K Assembly And Instruction Manual

DIODE / TRANSISTOR TESTER KIT

MODEL DT-100K

Assembly and Instruction Manual

Elenco Electronics, Inc.

Copyright © 1988 Elenco Electronics, Inc. Revised 2002 REV-K 753110

DT-100 PARTS LIST

If you are a student, and any parts are missing or damaged, please see instructor or bookstore.
If you purchased this diode/transistor tester kit from a distributor, catalog, etc., please contact Elenco
Electronics (address/phone/e-mail is at the back of this manual) for additional assistance, if needed.

RESISTORS

Qty. Symbol Value Color Code Part #

1 R14 100W 5% 1/4W brown-black-brown-gold 131000
2 R5, R6 220W 5% 1/4W red-red-brown-gold 132200
2 R1, R10 330W 5% 1/4W orange-orange-brown-gold 133300
1 R13 1kW 5% 1/4W brown-black-red-gold 141000
1 R7 5.6kW 5% 1/4W green-blue-red-gold 145600
1 R12 10kW 5% 1/4W brown-black-orange-gold 151000
1 R8 18kW 5% 1/4W brown-gray-orange-gold 151800
2 R2, R3 33kW 5% 1/4W orange-orange-orange-gold 153300
1 R9 47kW 5% 1/4W yellow-violet-orange-gold 154700
1 R11 100kW 5% 1/4W brown-black-yellow-gold 161000
1 R4 330kW 5% 1/4W orange-orange-yellow-gold 163300
1 R15 100kW 5% 1/4W Variable 192611

CAPACITORS

Qty. Symbol Value Description Part #

1 C6 .001pF (102) Discap 231036
3 C2, C3, C5 .01pF (103) Discap 241031
2 C1, C4 10mF Electrolytic 271045

SEMICONDUCTORS

Qty. Symbol Value Description Part #

1 D1 1N4001 Diode 314001
1 Q5 MPS A70 Transistor 320070
4 Q1-Q4 2N3904 Transistor 323904
1 IC1 555 Integrated Circuit 330555
5 L1-L5 LED (Light Emitting Diode) 350002

MISCELLANEOUS

Qty. Description Part# 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 No. 4 643460
4 Screw Self-Tapping 643652
1 7mm Hex Pot Nut 644101
1 8mm x 14mm Washer 645101
1 Lockwasher 5/16” 646101

1 Socket 8-Pin IC 664008
1 Transistor Socket 664500
1 Alligator Clip Black 680001
1 Alligator Clip Red 680002
1 Alligator Clip Green 680003
1 Alligator Clip Yellow 680004
4” Double Sided Tape 740004
1 Wire Black 15” 813110
1 Wire Red 15” 813210
1 Wire Yellow 15” 813410
1 Wire Green 15” 813510
1 Wire Blue 3” 814620
1 Solder Tube 9ST4

May be used instead of no. 4 screws:

4 Screw 4-40 x 1/4” 641430
4 Nut 4-40 644400

-1-

CONSTRUCTION

Introduction

The most important factor in assembling your Diode / Transistor Tester is good soldering techniques. Using the
proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40 watts is
recommended. The tip of the iron must be kept clean at all times and well tinned.

Safety Procedures

• Wear eye protection when soldering.
Locate soldering iron in an area where you do not have to go around it or reach over it.

•

• Do not hold solder in your mouth. Solder contains lead and is a toxic substance. Wash your hands
thoroughly after handling solder.

• Be sure that there is adequate ventilation present.

Assemble Components

In all of the following assembly steps, the components must be installed on the top side of the PC board unless
otherwise indicated. The top legend shows where each component goes. The leads pass through the
corresponding holes in the board and are soldered on the foil side.

Use only rosin core solder of 63/37 alloy.
DO NOT USE ACID CORE SOLDER!

What Good Soldering Looks Like

A good solder connection should be bright, shiny,
smooth, and uniformly flowed over all surfaces.

1. Solder all components from

the copper foil side only.
Push the soldering iron tip
against both the lead and
the circuit board foil.

2. Apply a small amount of

solder to the iron tip. This
allows the heat to leave the
iron and onto the foil.
Immediately apply solder to
the opposite side of the
connection, away from the
iron. Allow the heated
component and the circuit
foil to melt the solder.

3. Allow the solder to flow

around the connection.
Then, remove the solder
and the iron and let the
connection cool. The
solder should have flowed
smoothly and not lump
around the wire lead.

4.

Here is what a good solder
connection looks like.

Component Lead

Foil

Solder

Foil

Solder

Foil

Soldering Iron

Circuit Board

Soldering Iron

Soldering Iron

Types of Poor Soldering Connections

1. Insufficient heat - the

solder will not flow onto the
lead as shown.

2. Insufficient solder - let the

solder flow over the
connection until it is
covered. Use just enough
solder to cover the
connection.

3. Excessive solder - could

make connections that you
did not intend to between
adjacent foil areas or
terminals.

4. Solder bridges - occur

when solder runs between
circuit paths and creates a
short circuit. This is usually
caused by using too much
solder. To correct this,
simply drag your soldering
iron across the solder
bridge as shown.

Rosin

Soldering iron positioned
incorrectly.

Solder

Component Lead

Solder

Soldering Iron

Foil

Gap

Drag

-2-

ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD

R4 - 330kW Resistor

(org-org-yel-gold)

R1 - 330W Resistor

(org-org-brn-gold)

R3 - 33kW Resistor
R2 - 33kW Resistor

(org-org-org-gold)

R13 - 1kW Resistor

(brn-blk-red-gold)

R12 - 10kW Resistor

(brn-blk-org-gold)

R11 - 100kW Resistor

(brn-blk-yel-gold)

R14 - 100W Resistor

(brn-blk-brn-gold)

J1 - Jumper Wire

(see Figure A)

R5 - 220W Resistor
R6 - 220W Resistor

(red-red-brn-gold)

R9 - 47kW Resistor

(yel-vio-org-gold)

R8 - 18kW Resistor

(brn-gray-org-gold)

R7 - 5.6kW Resistor

(grn-blue-red-gold)

R10 - 330W Resistor

(org-org-brn-gold)

Figure A

Jumper Wire

Form jumper wire
from a discarded
resistor lead.

Figure D

Flat

Spacer

Mount with the flat side of
LED as shown in the top
legend of the PC board.

Figure B Figure C

Flat

Mount with the flat side of the
transistor as shown on the top legend
of the PC board. Leave 1/8” between
the part and PC board.

Figure E Figure F

Insert the IC socket
into the PC board
with the notch in the
direction shown on
the top legend.
Solder the IC socket
into place. Insert the
IC into the socket with
the notch in the same
direction as the notch
on the socket.

Notch

SAVE 3 CUT-OFF
RESISTOR LEADS

Polarity

Mark

(–)

(+)

Be sure that the positive lead is in the correct hole
as shown on the PC board. Bend the electrolytic
over and solder into place.

Band

D1

Diodes have polarity, so be sure that the band is
in the correct direction, as shown on the top
legend of the PC board.

-3-