Elenco Deluxe Digital Analog Trainer with Tools User Manual

DIGITAL / ANALOG TRAINER

MODEL XK-700

A COMPLETE MINI-LAB FOR BUILDING, TESTING

AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS

Instruction Manual

For Trainer with Organizer Case

Tools and meter not included.

Copyright © 2008, 1996 by Elenco®Electronics, Inc. All rights reserved. Revised 2008 REV-M 753028

No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

Elenco®Electronics, Inc.

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INTRODUCTION

POWER SUPPLY

Model XK-700 has five built-in power supplies which
will satisfy most design needs. This includes two
variable power supplies giving up to +20 volts and
–20 volts at .5 amp. Below 15V the current available
is over 1 amp. Three fixed power supplies give you
+12VDC, –12VDC or +5VDC at 1 amp each. These
fixed voltages are the most commonly used
voltages for design work. All supplies are regulated
to within 150mV. This means that you can increase
the current draw from no load to .5 amp and the
voltage will change less than 150 millivolts. All
supplies are also short circuit protected by using
integrated circuit regulator devices.

The analog trainer contain a complete function
generator capable of producing sine, square and
triangle waveform. The frequency of this generator
is continuously variable from one hertz to over

100,000 hertz in five steps. A fine tuning control
makes selection of any frequency easy. The output
voltage amplitude is variable between 0 to 15Vpp.
The output impedance is approximately 330 ohms.

DIGITAL TRAINER SECTION

The digital trainer has the necessary functions to do
your digital designs. They consist of a clock
generator, two no bounce logic switches, 8 LED
indicator lamps and 8 data switches. These
functions will make it easy to do your digital
experiments.

Congratulations on your purchase of the Elenco

®

Model XK-700 Digital / Analog Trainer. This trainer
is designed to simplify designing of digital and
analog circuits. It contains most of the necessary
test equipment needed to build and test these
circuits.

Your XK-700 has four basic trainers in a single
package. They are, 5 independent power supplies,
an analog trainer, a digital and a bredblock
assembly trainer. We shall proceed in describing
each trainer in the following sections.

ANALOG TRAINER SECTION
FUNCTION GENERATOR

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USERS DESCRIPTION OF FRONT PANEL CONTROL

1) Fuse holder - Easy access for replacement of 1.25A 250V fuse.

2) On-Off switch - Allows power to be applied to all outputs. Switch will light when on.

3) Power output terminals - This provides 30VAC center tapped at 15VAC - also provides output terminal

for positive and negative variable voltages.

4) Variable positive voltage control - Varies positive voltage from 0 to 20V at indicated output terminal.

5) Variable negative voltage control - Varies negative voltage from 0 to –20V at indicated output connector

pin.

6) Output terminals for 1kΩ and 100kΩ undedicated potentiometers.

7) 1kΩ undedicated potentiometer.

8) 100kΩ undedicated potentiometer.

9) Waveform selection control, square, triangle or sine generator waveforms.

10) Output terminals for all functions as stated, 4 pins per block.

11) Two logic switches - These are no bounce logic switches. Give one signal state change per move-

ment of switch.

12) Selects five ranges of frequencies from 10 to 100,000 hertz.

13) Fine frequency control - allows easy selection of desired function generator frequency.

14) Amplitude control - Controls the function generation output amplitude , 0-15Vpp.

15) DC offset control - controls the DC level of the generator output. DC may be varied +

10 volts from zero

level.

16) Input points for logic indicator LEDs. “A” input corresponds with A lamp, etc.

17) Logic indicators LEDs, total eight.

18) Eight data switches - Lets output of 5V or 0V depending on position.

19) Output terminals for all functions as stated, 4 pins per block.

20) Two breadboards containing a total of 1,660 tie points including 6 independent bus lines.

1

2

3

4

5

6

7 8 13 14 15

16

17

18

19

20

1211109

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GENERAL SPECIFICATIONS FOR MODEL XK-700

Power Supplies:

• 0V to 20VDC @ 0.5A (0V to 15V @ 1A)

• 0V to –20VDC @ 0.5A (0V to –15V @ 1A)

• +12V +

5% @ 1A

• –12V +

5% @ 1A

• +5V +

5% @ 1A

• 30VAC center-tapped at 15VAC @ 1A.

• Load regulation all DC supplies less than 0.2V no load to 0.5A

• Line regulation all DC supplies less than 0.2V 105 to 135V

• Hum and ripple all DC supplies less than .01V rms

• Short protection all DC supplies-Internal IC thermal cutoff

• Fuse - 1.25A 250V

Function Generator Analog Section:

• Waveforms sine, square, triangle, complimentary square

• Frequency - 1Hz to 100kHz in 5 steps continuously variable

• Fine frequency adjust - 10:1 approximate

• Amplitude variable 0-15Vpp

• Output impedance 330Ω: short protected

• DC offset change +

10V from zero crossing

Digital Section:

• Data switches, eight DPDT, Hi 5V, low 0V

• Logic switches, two no bounce with complimentary output

“On” voltage level 2.8V min., “Off” voltage level 1V max.

Input impedance 100kΩ.

• Eight LED readouts, 100kΩ input impedance

• Clock frequency, 1Hz to 100kHz in 5 steps continuously variable

• Clock amplitude, 5Vpp squarewave

• Clock rise time, better than 100nsec.

Bredboards Section:

• Two bredboards containing 830 tie points each (total 1,660 pins)

• 6 independent power bus lines for common connections

Variable Resistance (undedicated):

• 1kΩ Potentiometer

• 100kΩ Potentiometer

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TESTING THE XK-700 DIGITAL ANALOG TRAINER

The following paragraphs give detailed instructions
on testing the digital / analog trainer.

Note that in the XK-700 trainer there are five major
functions, (1) Power Supply (2) Logic Indicators (3)
Function Generator (4) Logic Switches and (5) Data
Switches. We shall proceed in testing out each
section. If any test fails, refer to the schematic
diagram and check the wiring and soldering of the
section involved.

POWER SUPPLY TESTING

Plug the trainer into a 120VAC outlet and switch to
the “ON” position (the power switch should light).
With a digital voltmeter, measure the voltage
outputs at the power blocks. The +12V should
measure between 11.4 and 12.6 volts. The 5V
supply should read between 4.75 and 5.25 volts.
The –12V supply should read between –11.4 and

12.6 volts.

Do not short the 15VAC output to ground.

Short the +12V, –12V and +5V supply to ground.
They should turn off and recover when the short is
removed. If you have a 25Ω 10 watt resistor, place
it across the output terminal (2 watt resistor will
work, but use it only for a few seconds). The output
of the 12V supply should not change more than 0.20
volts. Do the same on the 5V supply using a 10Ω 5
watt resistor. Again, the output should not change
more than 0.20 volts. In making this test, the
voltmeter leads should be clipped to the terminal
directly and no to the load leads. This is to prevent
errors due to voltage drop from contact resistance of
the load.

Check the variable voltage supplies in the same
manner. Set the output voltage between 10-15
volts. Place the 25Ω 10 watt resistor across the
output terminal. The voltage should stay within 0.20
volts of the no load voltage.

TESTING THE FUNCTION GENERATOR

To test the function generator, you will need an
oscilloscope. Connect the scope to the terminal
marked FREQ., and the ground clip to the terminal
marked GND. Adjust the waveform switch to sine,
the coarse frequency switch to 1k and the amplitude
control to maximum. Your scope should show a sine
wave with an output of about 15Vpp. If the sinewave
is clipped on top or bottom, adjust the DC offset
control for the most linear reading. Turn the FINE
ADJ control and the frequency should vary between
100 and 1,000 hertz. Check the other coarse
frequency positions.

Now, check the CLK output terminal. You should
see a square wave of about 5Vpp. If the scope is a
dual trace, connect one input to the CLK and the
other FREQ terminal. Set the waveform switch to
squarewave. You will note the two frequencies are
180

O

out of phase. If no scope is available, connect
a wire to the CLK terminal and input to “A” of the
logic indicators. Connect another wire to the FREQ
terminal and input “B”. Set the coarse frequency
switch to 10 hertz and the fine freq control to
minimum position. The two LEDs should blink
alternately.

TESTING THE LOGIC INDICATOR FUNCTION

There are eight logic indicators which you will be
checking out. Place a wire to the 5V power supply
and touch the “A” logic indicator test pin. The “A”
LED should light up. Remove the wire and the LED
should go out. Do the same for the B, C, D, E, F, G
and H test pins.