Elenco Electronics XK-700TK Assembly & Instruction Manual
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Elenco Electronics XK-700TK Assembly & Instruction Manual

Digital / analog trainer
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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 PS-700-B XK-700K POWER SUPPLY KIT (PS-700-B) PARTS LIST RESISTORS Qty. Symbol Value Description Part # R1, R2 120Ω 5% 1/4W (brown-red-brown-gold) 131200 1kΩ Pot PC MNT 192412 VR1, VR2 2kΩ Pot PC MNT 192421 100kΩ Pot PC MNT 192612 CAPACITORS 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 Semiconductors Connectors Diode Integrated Circuit (IC)
  • 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

    INTRODUCTION The XK-700K Digital/Analog Trainer is divided into four separate kits: BB-700-A, PS-700-B, AN-700-C and DG- 700D. Each bag of parts is clearly identified. Open only the kit called for in your procedure. DO NOT open any other bag at this time. The first kit is the BB-700-A which contains only the bredboard. The bredboard will be assembled to the front panel of the trainer during the assembly of the PS-700-B Power Supply.
  • Page 6 INSTALL COMPONENTS TO PC BOARD Start Here S1 - 5-Pin Connector Bottom Left Corner of PC Board (see Figure A) L-Bracket (see Figure B) VR4 - 100kΩ Pot VR3 - 1kΩ Pot (see Figure C) Top Left Corner of PC Board S3 - 3-Pin Connector S2 - 3-Pin Connector (see Figure A)
  • Page 7 INSTALL COMPONENTS TO PC BOARD Bottom Left Corner of PC Board Start Here C11 - 100µF 25V (see Figure E) R1 - 120Ω 5% 1/4W Resistor (brown-red-brown-gold) C6 - .1µF Mylar (104) (see Figure D) J28 - Jumper Wire (see Figure F) J6 - Jumper Wire (see Figure F) D12 - 1N4001 Diode...
  • Page 8 INSTALL COMPONENTS TO PC BOARD Start Here VR1 - 2kΩ Pot VR2 - 2kΩ Pot (see Figure C) B1 - 4-Pin Bredblox B2 - 4-Pin Bredblox B3 - 4-Pin Bredblox B4 - 4-Pin Bredblox (see Figure H) C12 - 100µF 25V Lytic (see Figure E) J26 - Jumper Wire J7 - Jumper Wire...
  • Page 9 INSTALL COMPONENTS TO PC BOARD Bottom Right Corner of PC Board Start Here Continue C2 - 1000µF 35V Lytic D1 - 1N4001 Diode D2 - 1N4001 Diode C4 - 1000µF 35V Lytic D3 - 1N4001 Diode (see Figure J) D4 - 1N4001 Diode D5 - 1N4001 Diode D6 - 1N4001 Diode D7 - 1N4001 Diode...

  • 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. Figure La 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. * Silicone Grease 6-32 x 5/16” Screw Insert the pins of each IC into the holes in the PC board. Then, 6-23 Nut 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 Back Side - Lower panel with the lugs as shown in Figure Q. Right Corner Install the fuse holder with the side lug in the position Illuminated Switch 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. Resistance From Circuit...
  • Page 17 Locations for Testing Points Plug of line cord LM-7812 LM-7912 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 LM-7805 LM-317 LM-337 Figure O -16-...

  • 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 POSSIBLE CAUSE No voltage at negative variable output. 1. Measure for an AC voltage of 18VAC at cathode of D8, D10. A. Transformer and/or secondary connection to PC board defective. 2. Measure DC voltage of –28VDC at pin 2 of U5 LM337. 3.

  • 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 Knobs Nuts 7mm 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 A) Transformer capacitor.
  • Page 25 2200µF REV-F Test Point...
  • 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 AN-700-C XK-700 ANALOG KIT (AN-700-C) PARTS LIST RESISTORS Qty. Symbol Value Color Code Part # R14, R44 100Ω 5% 1/4W brown-black-brown-gold 131000 200Ω 5% 1/4W red-black-brown-gold 132000 R46, R47 330Ω 5% 1/4W orange-orange-brown-gold 133300 1kΩ 5% 1/4W brown-black-red-gold 141000 2kΩ 5% 1/4W red-black-red-gold 142000 R7, R11...

  • 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 Continue J9 - Jumper Wire R5 - 200Ω 5% 1/4W Resistor (see Figure A) (red-black-brown-gold) C25 - .0022µF (222) Discap J8 - Jumper Wire (see Figure A) J10 - Jumper Wire J25 - Jumper Wire R3 - 6.8kΩ...
  • Page 30 INSTALL COMPONENTS TO PC BOARD Start Here Continue B6 - 4-pin Bredblox R48 - 22kΩ 5% 1/4W Resistor (see Figure F) (red-red-orange-gold) D16 - 1N4148 Diode Q1 - 2N3904 Transistor (see Figure G) (see Figure C) R14 - 100Ω 5% 1/4W Resistor R47 - 330Ω...
  • Page 31 INSTALL COMPONENTS TO PC BOARD Figure H Cut off Mount down flush with Start Here PC board. The value may be marked on the back side of pot. J18 - Jumper Wire Cut off excess lead (see Figure A) length after soldering. R13 - 8.2kΩ...
  • 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 Circuit Ohms...
  • 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 Nuts 8mm place with four #6 x 3/8” Washers 9mm thread cutting screws, as Knobs Nut 7mm...
  • Page 36 CIRCUIT DESCRIPTION Functional Block Diagram The function generator frequencies are produced by an XR2206 AM Input integrated circuit. This IC is capable of producing high quality sine, Symmetry ADJ. Sine/Saw square and triangle waveforms of high stability and accuracy. The Output Multiplier output waveform can be both amplitude and frequency modulated...
  • Page 37 SCHEMATIC DIAGRAM - ANALOG SECTION -36-...
  • Page 38 DG-700-D XK-700 DIGITAL KIT (DG-700-D) PARTS LIST RESISTORS Qty. Symbol Value Color Code Part # R36 - R43 120Ω 5% 1/4W brown-red-brown-gold 131200 220Ω 5% 1/4W red-red-brown-gold 132200 R16 - R19 1kΩ 5% 1/4W brown-black-red-gold 141000 R20 - R35 100kΩ 5% 1/4W brown-black-yellow-gold 161000 SEMICONDUCTORS...
  • 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 - 100kΩ 5% 1/4W Resistor (brown-black-yellow-gold) R35 - 100kΩ 5% 1/4W Resistor (brown-black-yellow-gold) R33 - 100kΩ 5% 1/4W Resistor (brown-black-yellow-gold) R32 - 100kΩ 5% 1/4W Resistor (brown-black-yellow-gold) R28 - 100kΩ 5% 1/4W Resistor (brown-black-yellow-gold) R27 - 100kΩ...
  • Page 41 INSTALL COMPONENTS TO PC BOARD Start Here R43 - 120Ω 5% 1/4W Resistor (brown-red-brown-gold) R42 - 120Ω 5% 1/4W Resistor (brown-red-brown-gold) S5 - 4-pin connector (see Figure A) R41 - 120Ω 5% 1/4W Resistor (brown-red-brown-gold) R40 - 120Ω 5% 1/4W Resistor (brown-red-brown-gold) R39 - 120Ω...
  • Page 42 INSTALL COMPONENTS TO PC BOARD Continue Start Here D25 - LED and Spacer U9 - IC socket 14-pin (see Figure B) U9 - 74HC04 IC (see Figure D) J27 - Jumper Wire (see Figure C) D24 - LED and Spacer (see Figure B) D23 - LED and Spacer Continue...
  • Page 43 INSTALL COMPONENTS TO PC BOARD SW4 - Slide Switch SW7 - Slide Switch SW10 - Slide Switch SW5 - Slide Switch SW8 - Slide Switch SW11 - Slide Switch Start Here SW6 - Slide Switch SW9 - Slide Switch SW12 - Slide Switch (see Figure F) SW13 - Slide Switch B7 - 4-pin Bredblox...
  • 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. The values given below are approximate.
  • 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 Volts Volts Measured In up position In up position less than 1V In up position In up position less than 1V 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 Figure I Nuts 8mm place with four #6 x 3/8” Washers 9mm thread cutting screws, as Knobs shown in Figure I. Nut 7mm Fasten the PC board to Washer 8mm the spacer on the front panel with a fiber washer and a 4-40 x 1/4”...
  • 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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Xk-700k

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