Elenco Electronics FG-500K User guide

FUNCTION GENERATOR KIT
MODEL FG-500K
Assembly and Instruction Manual
ELENCO®
Copyright © 2012 by Elenco®Electronics, Inc. All rights reserved. Revised 2012 REV-F 753069
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

PARTS LIST
If you are a student, and any parts are missing or damaged, please see instructor or bookstore.
If you purchased this kit from a distributor, catalog, etc., please contact ELENCO®(address/phone/e-mail is at
the back of this manual) for additional assistance, if needed. DO NOT contact your place of purchase as they
will not be able to help you.
RESISTORS
Qty. Symbol Description Color Code Part #
r1 R6 200Ω5% ¼W red-black-brown-gold 132000
r1 R1 620Ω5% ¼W blue-red-brown-gold 136200
r1R5 3.9kΩ5% ¼W orange-white-red-gold 143900
r1R7 8.2kΩ5% ¼W gray-red-red-gold 148200
r1 R8 10kΩ5% ¼W brown-black-orange-gold 151000
r1 R4 22kΩ5% ¼W red-red-orange-gold 152200
r1 R9 100kΩ5% ¼W brown-black-yellow-gold 161000
r1 R2 10kΩPotentiometer 192531
r1 R3 100kΩPotentiometer 192612
CAPACITORS
Qty. Symbol Value Description Part #
r1 C6 820pF (821) 10% Discap 228210
r1C5 .01μF (103) 10% Mylar 240119
r1C4 .1μF (104) 10% Mylar 251017
r1C3 1μF 50V Electrolytic (Lytic) 261047
r3 C2, C7, C8 10μF 16V Electrolytic (Lytic) 271045
r1 C1 100μF 16V Electrolytic (Lytic) 281044
r1 C9 1,000μF 16V Electrolytic (Lytic) 291044
SEMICONDUCTORS
Qty. Symbol Value Description Part #
r1 U1 XR-2206 Integrated circuit (IC) 332206
MISCELLANEOUS
-1-
Qty. Description Part #
r1 PC board 511003
r2 DPDT switch PC mount 541009
r1 Switch rotary 2p6pos 542207
r1 Battery snap 590098
r1 Battery holder 590099
r3 Knob 622009
r1 Case top 623061
r1 Case bottom 623062
r1 Binding post black 625031
r3 Nut binding post 625031HN
r3 Lockwasher binding post 625031LW
r2 Binding post yellow 625034
Qty. Description Part #
r4 Screw 2.8 x 8mm 641102
r3 Hex nut 7mm 644101
r1 Hex switch nut 9 x 15mm 644102
r2 Flat washer 8 x 14mm 645101
r1 Flat washer 9mm 645103
r4 Rubber foot 662015
r1 16-pin IC socket 664016
r1 Label top panel 721008
r1” Double-sided tape 740004
r9” Black wire 22ga. 814120
r1 Lead-free solder 9LF99

-2-
PARTS VERIFICATION
Before beginning the assembly process, familiarize yourself with the components and this instruction book.
Verify that all of the parts are present. This is best done by checking off the parts in the parts list.
RESISTORS CAPACITORS SEMICONDUCTOR
Electrolytic
(radial)
Potentiometer
Knob
MISCELLANEOUS
PC board
Case top
Case bottom
Screws
2.8 x 8mm 7mm
Nuts Washers
Flat
8 x 14mm
Rubber foot
Label
Lead-free solder
Carbon film
Discap
Battery snap
Black wire 22ga.
Double-sided tape
Mylar
16-pin IC socket
XR-2206 Integrated
circuit (IC)
Rotary switch
DPDT switch
Binding posts
Black Yellow
Binding post nut
Binding post
lockwasher
Battery holder
9mm
Flat
9 x 15mm

-3-
INTRODUCTION
IDENTIFYING CAPACITOR VALUES
Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads) or μF (microfarads). Most
capacitors will have their actual value printed on them. Some capacitors may have their value printed in the following manner.
IDENTIFYING RESISTOR VALUES
Use the following information as a guide in properly identifying the value of resistors.
BAND 1
1st Digit
Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9
BAND 2
2nd Digit
Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9
Multiplier
Color Multiplier
Black 1
Brown 10
Red 100
Orange 1,000
Yellow 10,000
Green 100,000
Blue 1,000,000
Silver 0.01
Gold 0.1
Resistance
Tolerance
Color Tolerance
Silver +10%
Gold +5%
Brown +1%
Red +2%
Orange +3%
Green +.5%
Blue +.25%
Violet +.1%
Bands
1 2 Multiplier
Tolerance
Electrolytic capacitors have a positive and a
negative electrode. The negative lead is
indicated on the packaging by a stripe with
minus signs and possibly arrowheads. Also, the
negative lead of a radial electrolytic is shorter
than the positive one.
Warning:
If the capacitor is connected
with incorrect polarity, it may
heat up and either leak, or
cause the capacitor to
explode.
OUTPUT:
• Waveforms: Sine, Triangle, Square
• Impedance: 600Ω+10%.
• Frequency: 1Hz - 1MHz in 6 decade steps with variable
ranges.
SINE WAVE:
• Amplitude: 0 - 3Vpp
• Distortion: Less than 1% (at 1kHz)
• Flatness: +0.05dB 1Hz - 100kHz
SQUARE WAVE:
• Amplitude: 8V (no load)
• Rise time: Less than 50ns (at 1kHz)
• Fall time: Less than 30ns (at 1kHz)
• Symmetry: Less than 5% (at 1kHz)
TRIANGLE WAVE:
• Amplitude: 0 - 3Vpp
• Linearity: Less than 1% (up to 100kHz)
POWER REQUIREMENTS:
• Standard 9V battery
OPERATING TEMPERATURE:
• 0OC to 50OC
Polarity
marking
(+)
(–)
Multiplier For the No. 0 1 2 3 4 5 8 9
Multiply By 110 100 1k 10k 100k .01 0.1
Second digit
First digit
Multiplier
Tolerance*
Note: The letter “R” may be
used at times to signify a
decimal point; as in 3R3 = 3.3
103K
100V
The letter M indicates a tolerance of +20%
The letter K indicates a tolerance of +10%
The letter J indicates a tolerance of +5%
Maximum working voltage
The value is 10 x 1,000 =
10,000pF or .01μF 100V
*
Assembly of your FG-500 Function Generator will
prove to be an exciting project and give much
satisfication and personal achievement. The FG-500
contains a complete function generator capable of
producing sine, square and triangle wave forms. The
frequency of this generator can be contiuously varied
from 1Hz to 1MHz in 6 steps. A fine frequency control
makes selection of any frequency in between easy.
The amplitude of the wave forms are adjustable from
0 to 3Vpp. This complete function generator system
is suitable for experimentation and applications by
the student. The entire function generator is
comprised of a single XR-2206 monolithic IC and a
limited number of passive circuit components.
SPECIFICATIONS

CONSTRUCTION
Solder Soldering Iron
Foil
Solder
Soldering Iron
Foil
Component Lead
Soldering Iron
Circuit Board
Foil
Rosin
Soldering iron positioned
incorrectly.
Solder
Gap
Component Lead
Solder
Soldering Iron
Drag
Foil
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.
1. Insufficient heat - the solder will
not flow onto the lead as shown.
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.
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.
What Good Soldering Looks Like
A good solder connection should be bright, shiny, smooth, and uniformly
flowed over all surfaces.
Types of Poor Soldering Connections
Introduction
The most important factor in assembling your FG-500K Function
Generator Kit 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.
Solder
For many years leaded solder was the most common type of solder
used by the electronics industry, but it is now being replaced by lead-
free solder for health reasons. This kit contains lead-free solder, which
contains 99.3% tin, 0.7% copper, and has a rosin-flux core.
Lead-free solder is different from lead solder: It has a higher melting
point than lead solder, so you need higher temperature for the solder to
flow properly. Recommended tip temperature is approximately 700OF;
higher temperatures improve solder flow but accelerate tip decay. An
increase in soldering time may be required to achieve good results.
Soldering iron tips wear out faster since lead-free solders are more
corrosive and the higher soldering temperatures accelerate corrosion,
so proper tip care is important. The solder joint finish will look slightly
duller with lead-free solders.
Use these procedures to increase the life of your soldering iron tip when
using lead-free solder:
• Keep the iron tinned at all times.
• Use the correct tip size for best heat transfer. The conical tip is the
most commonly used.
• Turn off iron when not in use or reduce temperature setting when
using a soldering station.
•
Tips should be cleaned frequently to remove oxidation before it becomes
impossible to remove. Use Dry Tip Cleaner (Elenco
®
#SH-1025) or Tip
Cleaner (Elenco
®
#TTC1). If you use a sponge to clean your tip, then use
distilled water (tap water has impurities that accelerate corrosion).
Safety Procedures
•Always wear safety glasses or safety goggles to
protect your eyes when working with tools or
soldering iron, and during all phases of testing.
• Be sure there is adequate ventilation when soldering.
• Locate soldering iron in an area where you do not have to go around
it or reach over it. Keep it in a safe area away from the reach of
children.
•Do not hold solder in your mouth. Solder is a toxic substance.
Wash hands thoroughly after handling solder.
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.
DO NOT USE ACID CORE SOLDER!
'
-4-

-5-
Figure B
Bend the capacitor over before
soldering.
ASSEMBLE COMPONENTS TO THE PC BOARD
Care must be given to identifying the proper components and in good soldering habits. Refer to the soldering
tips section in this manual before you begin installing the components. Place a check mark in the box after
each step is complete.
Figure A
Electrolytic capacitors
have polarity. Be sure to
mount them with the
short negative (–) lead
(marked on side) in the
correct hole.
Warning: If the capa-
citor is connected with
incorrect polarity, it may
heat up and either leak or
cause the capacitor to
explode.
Mount the electrolytics horizontal to the PC
board. Bend the leads at right angles and
then insert the leads into the PC board.
Figure D
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
C1 - 100μF 16V Electrolytic
(see Figure A)
C2 - 10μF 16V Electrolytic
(see Figure A)
C3 - 1μF 50V Electrolytic
(see Figure A)
C4 - .1μF 10% Mylar (104)
(see Figure B)
C6 - 820pF 10% Discap (821)
C5 - .01μF 10% Mylar (103)
(see Figure B)
J7, J8 - Jumper wire
(use a discarded lead)
C9 - 1000μF 16V Electrolytic
(see Figure A)
S3 - Slide Switch DPDT
R7 - 8.2kΩ5% ¼W Resistor
(gray-red-red-gold)
R8 - 10kΩ5% ¼W Resistor
(brown-black-orange-gold)
R5 - 3.9kΩ5% ¼W Resistor
(orange-white-red-gold)
R9 - 100kΩ5% ¼W Resistor
(brown-black-yellow-gold)
R1 - 620Ω5% ¼W Resistor
(blue-red-brown-gold)
J1 - 4” Black wire 22ga.
J3 - 2½” Black wire 22ga.
(see Figure C)
U1 - 16-pin IC socket
U1 - XR-2206 IC
(see Figure D)
R6 - 200Ω5% ¼W Resistor
(red-black-brown-gold)
S2 - Slide Switch DPDT
R4 - 22kΩ5% ¼W Resistor
(red-red-orange-gold)
C7 - 10μF 16V Electrolytic
(see Figure A)
C8 - 10μF 16V Electrolytic
(see Figure A)
J2 - 2½” Black wire 22ga.
(see Figure C)
(+)
(–)
or
Figure C
Cut one 4” and two 2½” wires
and strip ¼” of insulation off of
both ends of the wires. Solder
these wires to the points J1, J2,
and J3.
PC board

Figure Ea Figure Eb
Mount the pot down flush with the PC
board. Solder and cut off excess leads.
-6-
ASSEMBLE COMPONENTS TO THE PC BOARD (continued)
R2 - 10kΩPotentiometer
Hex Nut 7mm
(see Figures Ea & Eb)
S1 - 6 position Rotary switch
(see Figure F)
R3 - 100kΩPotentiometer
(see Figure Ea)
Battery snap
(see Figure G)
Figure G
Thread the battery snap wires
through the hole in the PC board
from the solder side as shown.
Solder the red wire to the BT+
point and the black wire to the BT–
point on the PC board.
Red Wire (BT+)
Black Wire (BT–)
Red Wire (BT+)
Black Wire (BT–)
Put a 7mm hex
nut onto the pot
as shown.
Figure F
Mount down
flush with PC
board.
Cut off tab
Cut off tab
rPeel the backing off of the front label and carefully adhere it to the top
case, aligning the holes while doing so, as shown in Figure H.
INSTALL COMPONENTS TO FRONT PANEL
Figure H

-7-
WIRING (See Figure J)
rSolder the wire from hole J1 on the PC board to
the first yellow binding post as shown.
rSolder the wire from hole J2 on the PC board to
the second yellow binding post as shown.
rSolder the wire from hole J3 on the PC board to
the black binding post as shown.
Wire from
Point J3
Wire from
Point J2
Wire from
Point J1
Component side
of PC board
Figure J
Figure I
rInstall the colored binding posts to the
panel as shown in Figure I. Use the
hardware shown in the figure. Make sure
that the small nuts are tight.
INSTALL COMPONENTS TO FRONT PANEL (continued)
Nuts
Lockwashers
Binding post
Yellow
Black
Small nut
Yellow

-8-
FINAL ASSEMBLY
Figure K
rFit the PC board assembly into the top
case, making sure that all switches and
pots come through the holes in the panel
as shown in Figure K.
rPlace the washers onto their locations as
shown in Figure K, being careful to check
the sizes. Then, tighten the hex nuts onto
the potentiometers and rotary switch,
noting their size as shown in Figure K.
rPeel off the protective backing on one side
of the double-sided tape and adhere it to
the bottom case in the location shown in
Figure L.
rPeel off the remaining protective backing
from the tape and adhere the battery
holder to the tape, with the battery holder in
the direction shown in Figure L.
rObtain a 9 volt battery (alkaline preferred).
Press the battery snap onto the battery
terminals (see Figure L) and then mount
the 9V battery onto the holder.
9mm Hex
switch nut
9mm x
15mm Flat
washer
8mm x 14mm
Washers
7mm Hex
pot nuts
Top case
Figure L
Top case
Bottom case
9V Battery
Battery snap
Battery holder
Double-sided tape

-9-
rRemove the backing from each rubber foot and
place them in the locations shown in Figure M.
rAssemble the top and bottom case sections and
fasten with four 2.8 x 8mm self-tapping screws as
shown in Figure M. Make sure the slots on the
side line up with one another.
rTurn the shafts on the two potentiometers and
rotary switch fully counter-clockwise. Push the
three knobs onto the shafts so that the line on the
knobs are on the points shown in Figure N.
TESTING THE FG-500 FUNCTION GENERATOR
The unit may be tested by following the 4 steps listed below. Should any of these tests fail, refer to the
Troubleshooting Guide.
1) SET THE SWITCHES AND POTS AS FOLLOWS:
On/Off On
Range 10
Frequency Maximum (clockwise)
Amplitude Maximum (clockwise)
Sine/Triangle Set Sine/Triangle switch to Sine position
Figure M
2.8 x 8mm Screws
2.8 x 8mm
Screws
Rubber feet
Rubber
feet
Slot
Figure N
FINAL ASSEMBLY (continued)

-10-
TROUBLESHOOTING GUIDE
A) NO SINE/TRIANGLE OR SQUARE WAVE OUTPUT
1) Check the soldering on switch S3.
2) Check battery and battery snap.
3) Check the soldering on IC U1.
4) Check for +9V on IC1 pin 4.
5) Check that U1 is not installed backwards.
6) Check all of the values and soldering on R1, R2, R3, R4, R5, R7, R8, R9, C8, and C9.
B) WRONG FREQUENCY ON ANY RANGE SETTING
1) This indicates a wrong value capacitor in the bad range position.
C) SINE/TRIANGLE SWITCH DOESN’T WORK
1) Check the soldering on switch S2 and R6.
2) Check the value of R6.
3) Check pin 13 and 14 of U1.
D) AMPLITUDE CONTROL DOESN’T WORK
1) Check the soldering on R3, R7, R8, R4 and R9.
2) Check the values of the above mentioned components.
E) FREQUENCY CONTROL DOESN’T WORK
1) Check the soldering on R1 and R2.
2) Check the values of the above two resistors.
In each of the following steps, start with the switch
and pots as shown on the previous page.
2) OUTPUT WAVEFORMS
Connect an oscilloscope probe to the square wave
output.You should see about 8V peak to peak square
wave of a little over 15Hz. Connect the oscilloscope
probe to the sine/triangle wave output. You should
see a sine wave of approximately 3V peak to peak or
greater. Set the Sine/Triangle switch to the Triangle
wave position.You should see a triangle waveform of
approximately 3V peak to peak or greater. In both
sine and triangle waves, the frequency is also a little
over 15Hz.
3) FREQUENCY CONTROLS
6 range settings, vary the FREQUENCY pot from
max to min and check that the frequency varies
according to Table 1 on page 12.
4) AMPLITUDE CONTROLS
Set the switch and pots as in Step 1. Connect the
oscilloscope to the sine/triangle wave output and
vary the AMPLITUDE pot. The sine wave amplitude
should vary from near zero to approximately 3V peak
to peak or greater.

-11-
FUNCTIONAL DESCRIPTION
The FG-500 is a function generator integrated circuit capable of producing high quality sine, triangle, and square
waves of high stability and accuracy. A picture of each waveform is shown below:
THEORY OF OPERATION
The heart of the FG-500 Function Generator is the
XR-2206 monolithic function generator integrated
circuit. The XR-2206 is comprised of four main
functional blocks as shown in the functional block
diagram (Figure 1). They are:
• A Voltage Controlled Oscillator (VCO)
• An Analog Multiplier and Sine-shaper
• Unity Gain Buffer Amplifier
• A set of current switches
The VCO actually produces an output frequency
proportional to an input current, which is produced by
a resistor from the timing terminals to ground. The
current switches route one of the currents to the VCO
to produce an output frequency. Which timing pin
current is used, is controlled by the FSK input (pin 9).
In the FG-500, the FSK input is left open, thus only
the resistor on pin 7 is used. The frequency is
determined by this formula:
fo= 1/RC Hz
where fois the frequency in Hertz
R is the resistance at pin 7 in Ohms
C is the capacitance across pin 5 and 6 in Farads
Sine Wave Triangle Wave Square Wave
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Figure 1
Current
Switches
VCO
Multiplier
and
Sine
Shaper
+1
AM Input
Sine/Saw
Output
Mult. Out
V+
Timing
Capacitor
Timing
Resistor
Symmetry
Adjust
Waveform
Adjust
Ground
Sync
Output
Bypass
FKS
Input
Note that frequency is inversely proportional to the
value of RC. That is, the higher the value of RC, the
smaller the frequency.
The resistance between pins 13 and 14 determine the
shape of the output wave on pin 2. No resistor
produces a triangle wave. A 200Ωresistor produces a
sine wave.

-12-
CONTROLS
RANGE SWITCHES
Six ranges of frequency are provided by the range switch as shown in Table 1.
Table 1
POSITION TYPICAL FREQUENCY RANGE
1 1Hz - 15Hz
2 10Hz - 150Hz
3 100Hz - 1.5kHz
4 1kHz - 15kHz
5 10kHz - 150kHz
6 100kHz - 1MHz
SINE/TRIANGLE SWITCH
This SINE/TRIANGLE Switch selects the waveform,
sine wave or triangle wave, sent to the
SINE/TRIANGLE output terminal.
FREQUENCY MULTIPLIER
The multiplier is a variable control allowing frequency
settings between fixed ranges. The ranges are as
shown in Table 1.
AMPLITUDE CONTROL
The Amplitude Control provides amplitude
adjustment from near 0 to 3V or greater for both sine
and triangle waveforms.
ON/OFF SWITCH
The ON/OFF Switch turns the power to the FG-500
on or off.
OUTPUT TERMINAL
The output marked SINE/TRIANGLE provides the
sine and triangle waveforms. The output marked
SQUARE WAVE provides the square wave. The
output marked GND provides the ground for all
output waveforms.
1) The heart of the FG-500 Function Generator is
the _________ monolithic function generator
integrated circuit.
2) The XR-2206 is comprised of four main blocks.
They are ____________________________,
___________________, __________________,
and ____________________.
3) The VCO actually produces an output frequency
proportional to an input ________________.
4) The current switches route one of the currents to
the VCO to produce an output __________.
5) The frequency is determined by the formula
_______________.
6) Frequency is inversely proportional to the value
of _____________.
7) The resistance between pins 13 and 14
determine the shape of the __________ wave on
pin 2.
8) No resistor produces a __________ wave.
9) A 200Ωresistor produces a ___________ wave.
10) The six ranges of frequency provided by the
range switch are:
________ to ________.
________ to ________.
________ to ________.
________ to ________.
________ to ________.
________ to ________.
QUIZ (answers on bottom of following page)

SCHEMATIC DIAGRAM
-13-
Answers: 1) XR-2206; 2) A Voltage Controlled Oscillator, An Analog Multiplier and Sine Shaper, Unity Gain Buffer
Amplifier and A Set of Current Switches; 3) Current; 4) Frequency; 5) 1/RC; 6) RC; 7) output; 8) triangle; 9) sine;
10) 1Hz to 15Hz, 10Hz to 150Hz, 100Hz to 1.5kHz, 1kHz - 15kHz, 10kHz - 150kHz, 100kHz - 1MHz.

Space War Gun
K-10
Rapid fire or single shot with 2
flashing LEDs.
0-15V Power Supply
K-11
A low-cost way to
supply voltage
to electronic
games, etc.
0-15VDC @ 300mA
8.5VAC @ 500mA
Christmas Tree
K-14
LED Robot Blinker
K-17
You’ll have fun displaying the
PC board
robot.
Learn about
free-running
oscillators.
Digital Bird
K-19
You probably have never heard
a bird sing this way before.
Nerve Tester
K-20
Test your ability to remain calm.
Indicates failure by a lit LED or
mild shock.
Yap Box
K-22A
This kit is a hit
at parties.
Makes 6
exciting
sounds.
Burglar Alarm
K-23
Alarm for your car, house, room,
or closet.
Whooper Alarm
K-24
Can be used as a sounder or
siren.
Metal Detector
K-26
Find new money and old
treasure. Get started in this
fascinating hobby.
Pocket Dice
K-28
To be used with any game of
chance.
FM Microphone
AK-710/K-30
Learn about microphones,
audio amplifiers, and RF
oscillators. Range up
to 100 feet.
Telephone Bug
K-35
Our bug is only the size of a quarter,
yet transmits both sides of a
telephone
conversation
to any FM
radio.
Sound Activated Switch
K-36
Clap and the light comes on . . .
clap again and it goes off.
Lie Detector
K-44
The sound will
tell if you are
lying. The
more you lie,
the louder the
sound gets.
Motion Detector
AK-510
Use as a sentry,
message
minder, burglar
alarm, or a
room
detector.
Two IC AM Radio
AM-780K
New design - easy-to-build,
complete radio on a single PC
board. Requires 9V battery.
Transistor Tester
DT-100K
Test in-circuit transistors and
diodes.
Variable Voltage DC
Power Supply Kit
0-15VDC
XP-15K
Ideal for students,
technicians, and
hobbyists.
Great for
breadboarding.
Auto-scan FM Radio Kit
FM-88K
Unique design - two-IC FM
receiver with training course.
EDUCATION KITS
Complete with PC Board and Instruction Book
Requires 9V battery
Requires
9V battery
Requires
9V battery
Requires
9V battery
Requires
9V battery
Requires
9V battery
Requires 9V battery
Requires
9V battery
Requires
9V battery
Requires 2
“AA” batteries
Training course incl.
No batteries
required! Requires 9V battery
Requires
9V battery
Requires
9V battery
Requires
9V battery
Produces flashing
colored LEDs
and three
popular
Christmas
melodies.
Requires
9V battery
-14-
Requires
9V battery

ELENCO®
150 Carpenter Avenue
Wheeling, IL 60090
[phone]
Website: www.elenco.com
e-mail: [e-mail]