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Elenco Electronics XK-700K Assembly And Instruction Manual

Digital / analog trainer a complete mini-lab for building, testing and prototyping analog and digital circuits
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DIGITAL / ANALOG TRAINER
MODEL XK-700K
A COMPLETE MINI-LAB FOR BUILDING, TESTING
AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS
Tools and meter shown not included.
Assembly & Instruction Manual
Elenco Electronics, Inc.
Copyright © 1996 Elenco Electronics, Inc.
Revised 2001
REV-E
753029

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  • Page 1 DIGITAL / ANALOG TRAINER MODEL XK-700K A COMPLETE MINI-LAB FOR BUILDING, TESTING AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS Tools and meter shown not included. Assembly & Instruction Manual Elenco Electronics, Inc. Copyright © 1996 Elenco Electronics, Inc. Revised 2001 REV-E 753029...
  • Page 2 XK-700K POWER SUPPLY KIT (PS-700-B) PARTS LIST Qty. Symbol Value R1, R2 VR1, VR2 100k Qty. Symbol Value C6 - C10 .1 F 100V C11 - C17 100 F C1, C2, C4, C5 1000 F 35V 2200 F 25V Qty.

  • Page 3: Parts Verification

    PARTS VERIFICATION Before beginning the assembly process, first familiarize yourself with the components and this instruction book. Verify that all parts are present. This is done best by checking off each item in the parts list. Resistors Capacitors PC Mount Potentiometer Electrolytic (Lytic)
  • Page 4 CONSTRUCTION Introduction The most important factor in assembling your XK-700K Digital / Analog Trainer 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.

  • Page 5: Power Supply Specifications

    Power Supply The XK-700K has five built-in power supplies which will satify 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 1 amp. Three fixed power supplies give you +12VDC, –12VDC or +5VDC at 1 amp each.
  • Page 6 INSTALL COMPONENTS TO PC BOARD Start Here S1 - 5-Pin Connector (see Figure A) L-Bracket (see Figure B) VR4 - 100k VR3 - 1k (see Figure C) S3 - 3-Pin Connector S2 - 3-Pin Connector (see Figure A) L-Bracket (see Figure B) C8 - 0.1 F Mylar (104) (see Figure D) Figure A...
  • Page 7 INSTALL COMPONENTS TO PC BOARD Start Here C11 - 100 F 25V (see Figure E) R1 - 120 5% 1/4W Resistor (brown-red-brown-gold) C6 - .1 F Mylar (104) (see Figure D) J28 - Jumper Wire (see Figure F) J6 - Jumper Wire (see Figure F) D12 - 1N4001 Diode D11 - 1N4001 Diode...
  • Page 8 INSTALL COMPONENTS TO PC BOARD Bottom Left Corner of PC Board Figure H Hold the bredblock down flush to the PC board from the top legend side and solder the metal pins in place. Then, melt the plastic pins with your soldering iron to hold the plastic blocks in place, as shown.
  • Page 9 INSTALL COMPONENTS TO PC BOARD Start Here C2 - 1000 F 35V Lytic C4 - 1000 F 35V Lytic (see Figure J) C1 - 1,000 F 35V Lytic C5 - 1,000 F 35V Lytic (see Figure J) Figure J These lytics must be mounted horizontal to the PC board.

  • Page 10: Mounting The Pc Board

    MOUNTING THE PC BOARD Note: The holes in the two side panels have been punched differently. Be sure that you have the correct side panel when mounting them to the PC board. IMPORTANT: Push the PC board up as far as possible before tightening the screws, as shown in Figure La. Mount the back panel using four 4-40 x 1/4”...
  • Page 11 Place the top panel onto the unit and align the components with the holes in the top panel. Push the PC board up until the components come through the top panel and tighten the screws. MOUNT COMPONENTS TO THE SIDE PANELS Mount U1, U3 and U5 to the left side panel as shown in Figure N.
  • Page 12 Mount U2 and U4 to the right side panel as shown in Figure O. Insert the pins of each IC into the holes in the PC board. Then, with the hardware shown in Figure MA, attach each IC to the side panel.
  • Page 13 HOW TO INSTALL CONNECTORS ONTO TRANSFORMER WIRES A connector will be placed onto the primary wires of the transformer. This will allow you to remove the top panel from the trainer. Follow the procedures below. Cut a six inch length off of each black primary wire. Strip the insulation off of each end of the six inch wires to expose 1/4”...
  • Page 14 MOUNT COMPONENTS TO PANEL Push the illuminated switch into the hole in the top panel with the lugs as shown in Figure Q. Install the fuse holder with the side lug in the position shown in Figure Q. Fasten the fuse holder in place with the nut as shown in Figure Q.
  • Page 15 WIRE SWITCH AND FUSE HOLDER (see Figure U) Line Cord Slide the line cord through the back panel as shown. Spread the three line cord wires apart 6” from the end. Fuse Strip the insulation off of both ends of the 6” red wire to expose 1/4” of bare wire. Pass the wire through the 1/2”...
  • Page 16 RESISTANCE ANALYSIS OF POWER SUPPLY Static testing of the power supply circuits. Do not plug the power supply into the 120VAC power supply source until all resistance readings check out. The values given below are approximate. See Figure O for locations of testing points. From Right Side Panel GND 5-pin connector...
  • Page 17 Locations for Testing Points LM-7812 ••• ••• LM-7805 LM-7912 ••• ••• LM-317 Figure O -16- Plug of line cord On test points 4 - 14 use the leads of the diodes. 5-pin connector right 5-pin connector –20 5-pin connector +20 5-pin connector left •••...

  • Page 18: Fuse Replacement

    VOLTAGE ANALYSIS OF POWER SUPPLY Proceed with the voltage analysis only if the resistance readings were satisfactory. Place the top panel on the unit. If any capacitors are inserted backwards, the panel will shield you if they explode. Make sure that the ON/OFF switch is in the OFF position. Plug the line cord into the 120VAC power source.

  • Page 19: Power Supply Testing

    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.
  • Page 20 PROBLEM No voltage at negative variable output. No or low voltage at negative variable output with load. No +12V at output. No +12V at output with load. No –12V at output. No –12V at output with load. No +5VDC at output No +5VDC at output with load.

  • Page 21: Final Assembly

    FINAL ASSEMBLY If you are immediately going to build the remaining sections, do not continue with the instructions on this page and proceed to page 22. Fasten the front panel in place with four #6 x 3/8” thread cutting screws, as shown in Figure W.
  • Page 22 INSTALL COMPLETED UNIT INTO CASE Place the strain relief onto the line cord as shown in Figure AA. Squeeze the two sections together with pliers as shown in Figure BB. Then, insert the strain relief into the hole. Lay the trainer inside of the case as shown in Figure CC. Align the holes in the bottom case with those in the trainer and secure it into place with four #6 x 1/2”...

  • Page 23: Circuit Description

    CIRCUIT DESCRIPTION The power supply features two variable output voltages and three fixed 12V, –12V and 5V variable output voltages are 1.25V to 20V and –1.25 to –20V at up to 1 ampere maximum current. All supplies are regulated to better than 0.2V when going from no load to full load.
  • Page 24 In practice, the current through the diodes is not as shown in Figure 2C. Because capacitor C1 has a charge after the first cycle, the diode will not conduct until the positive AC voltage exceeds the positive charge in the capacitor.
  • Page 25 Test Point 2200 F REV-F...
  • Page 26 QUIZ - POWER SUPPLY SECTION INSTRUCTIONS - Complete the following examination and check your answers carefully. 1. AC voltage is supplied to the rectifier stages by the . . . A. step-up transformer. B. step-down transformer. C. 1 to 1 transformer. D.
  • Page 27 XK-700 ANALOG KIT (AN-700-C) PARTS LIST Qty. Symbol Value R14, R44 R46, R47 5% 1/4W 5% 1/4W R7, R11 4.7k 6.8k 8.2k R4, R45, R48 100k Trim Pot VR6, VR7 100k Qty. Symbol Value 5pF (5) 22pF (22) 100pF (101) .001 F (102) .0022 F (222) .01 F (103)

  • Page 28: Specifications

    INTRODUCTION - ANALOG SECTION The Analog Section of your trainer contains a complete function generator capable of producing sine, square, and triangle waveforms. The frequency of this generator can be continuously varied from 1 hertz to over 100,000 hertz in five steps: 10, 100, 1k, 10k, and 100k. A fine frequency control makes selection of any frequency in between easy.
  • Page 29 INSTALL COMPONENTS TO PC BOARD Start Here J9 - Jumper Wire (see Figure A) C25 - .0022 F (222) Discap J10 - Jumper Wire J25 - Jumper Wire (see Figure A) VR8 - 100k Trim Pot (see Figure E) C26 - 22pF (22) Discap C23 - 100pF (101) Discap J11 - Jumper Wire J12 - Jumper Wire...
  • Page 30 INSTALL COMPONENTS TO PC BOARD Start Here B6 - 4-pin Bredblox (see Figure F) D16 - 1N4148 Diode (see Figure G) R14 - 100 5% 1/4W Resistor (brown-black-brown-gold) B5 - 4-pin Bredblox (see Figure F) R12 - 1k 5% 1/4W Resistor (brown-black-red-gold) R44 - 100 5% 1/4W Resistor...
  • Page 31 INSTALL COMPONENTS TO PC BOARD Start Here J18 - Jumper Wire (see Figure A) R13 - 8.2k 5% 1/4W Resistor (gray-red-red-gold) J17 - Jumper Wire (see Figure A) C18 - .001 F (102) Mylar (see Figure EA) R6 - 12k 5% 1/4W Resistor (brown-red-orange-gold) VR6 - 100k...
  • Page 32 RESISTANCE ANALYSIS OF ANALOG SECTION Static testing of the analog circuits. Do not plug in the power supply into 120VAC power source until all resistance readings check out. The values given below are approximated. SET SW3 TO SQUARE WAVE (refer to top panel) From Pin 11 (U6) Pin 3 (U10)
  • Page 33 VOLTAGE ANALYSIS OF ANALOG SECTION Proceed with the voltage analysis only if the resistance readings were satisfactory. The values given below are approximate. The following measurements will be taken from the copper side of the PC board. Turn the unit on and place it upside down.
  • Page 34 5. Set VR8 fully counter-clockwise. 6. Adjust the DC OFFSET knob until the meter reads 0 volts DC. 7. Set the meter to the 20 volts AC range and slowly turn VR8 clockwise until the meter reads 5.8 volts AC. Note: Adjusting the DC offset will affect the VAC readings.

  • Page 35: Final Assembly

    FINAL ASSEMBLY If you are immediately going to build the remaining section, do not continue with the instructions on this page, proceed to page 35. Fasten the front panel in place with four #6 x 3/8” thread cutting screws, as shown in Figure K.
  • Page 36 CIRCUIT DESCRIPTION The function generator frequencies are produced by an XR2206 integrated circuit. This IC is capable of producing high quality sine, square and triangle waveforms of high stability and accuracy. The output waveform can be both amplitude and frequency modulated by an external voltage.
  • Page 37 SCHEMATIC DIAGRAM - ANALOG SECTION -36-...
  • Page 38 INTRODUCTION The Digital Section is the fourth package of the XK-700K kit that you are building. The Digital Section of your trainer contains all of 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.
  • Page 39 USERS DESCRIPTION OF FRONT PANEL 1. Output Terminals - For all functions as stated. 4 pins per block. 2. Two Logic Switches - These are no bounce logic switches. Give one signal state change per movement of switch. 3. Input Terminals for Logic Indicator LEDs - “A” input corresponds with “A” lamp, etc. 4.
  • Page 40 INSTALL COMPONENTS TO PC BOARD Start Here R34 - 100k 5% 1/4W Resistor (brown-black-yellow-gold) R35 - 100k 5% 1/4W Resistor (brown-black-yellow-gold) R33 - 100k 5% 1/4W Resistor (brown-black-yellow-gold) R32 - 100k 5% 1/4W Resistor (brown-black-yellow-gold) R28 - 100k 5% 1/4W Resistor (brown-black-yellow-gold) R27 - 100k 5% 1/4W Resistor (brown-black-yellow-gold)
  • Page 41 INSTALL COMPONENTS TO PC BOARD Start Here R43 - 120 5% 1/4W Resistor (brown-red-brown-gold) R42 - 120 5% 1/4W Resistor (brown-red-brown-gold) S5 - 4-pin connector (see Figure A) R41 - 120 5% 1/4W Resistor (brown-red-brown-gold) R40 - 120 5% 1/4W Resistor (brown-red-brown-gold) R39 - 120 5% 1/4W Resistor...
  • Page 42 INSTALL COMPONENTS TO PC BOARD Start Here U9 - IC socket 14-pin U9 - 74HC04 IC (see Figure D) Continue U8 - 14-pin IC socket U8 - 74HC04 IC (see Figure D) J19 - Jumper Wire (see Figure C) R15 - 220 5% 1/4W Resistor (red-red-brown-gold) J22 - Jumper Wire...
  • Page 43 INSTALL COMPONENTS TO PC BOARD Start Here Continue Figure E Hold the bredblox down flush to the PC board from the top legend side and solder the metal pins into place. Then, melt the plastic pins with your soldering iron to hold the plastic blocks in place as shown.
  • Page 44 RESISTANCE ANALYSIS OF DIGITAL SECTION Place the top panel onto the unit. Static testing of the digital section circuits. Do not plug the power supply into a 117 volt power source until all of the resistance readings check out. approximate. From Switch Position In down position...
  • Page 45 VOLTAGE ANALYSIS OF DIGITAL SECTION Plug the power supply into a 117 volt power source. The values given below are approximate. From Switch Position In up position In up position In up position In up position In up position In up position In up position In up position In up position...
  • Page 46 TESTING THE DIGITAL SECTION TESTING THE LOGIC INDICATOR FUNCTION There are eight logic indicators which you will be checking out. Put 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 pins.
  • Page 47 FINAL ASSEMBLY Fasten the front panel in place with four #6 x 3/8” thread cutting screws, as shown in Figure I. Fasten the PC board to the spacer on the front panel with a fiber washer and a 4-40 x 1/4” screw (from Power Supply...
  • Page 48 INSTALL COMPLETED UNIT INTO CASE Place the strain relief onto the line cord as shown in Figure N. Squeeze the two sections together with pliers as shown in Figure O. Then, insert the strain relief into the hole. Lay the trainer inside of the case as shown in Figure P. Align the holes in the bottom case with those in the trainer and secure it into place with four #6 x 1/2”...
  • Page 49 CIRCUIT DESCRIPTION - DIGITAL SECTION THE DATA SWITCHES There are eight data switches labeled SW1 through SW8. The circuit is very simple. To perform the desired functions, there is a double throw double pole switch, wired as a single pole double throw. One end is connected to the 5V, the other to ground and the center lug is connected to the output.

  • Page 50: Schematic Diagram

    SCHEMATIC DIAGRAM -49-...
  • Page 51 QUIZ - DIGITAL SECTION INSTRUCTIONS: Complete the following examination, check your answers carefully. 1. The logic switches consist of . . . A. two NAND gates and an SPST switch. B. three OR gates. C. two NAND gates and a DPDT switch. D.
  • Page 52 Elenco Electronics, Inc. 150 W. Carpenter Ave. Wheeling, IL 60090 (847) 541-3800 Web Site: http://www.elenco.com e-mail: elenco@elenco.com...

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