Elenco Electronics XK-700-SEMI Assembly And Instruction Manual Download Page 40

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Elenco Electronics, Inc.

150 W. Carpenter Avenue

Wheeling, IL 60090

(847) 541-3800

http://www.elenco.com

e-mail: [email protected]

Summary of Contents for XK-700-SEMI

Page 1: ...ER MODEL XK 700 SEMI A COMPLETE MINI LAB FOR BUILDING TESTING AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS Elenco Electronics Inc Copyright 1997 Elenco Electronics Inc REV C Revised 2001 753045 Assembl...

Page 2: ...function generator capable of producing sine square and triangle waveforms The frequency of the generator is continuously variable from one hertz to over 100 000 hertz in five steps A fine tuning con...

Page 3: ...4 Screw 4 40 x 1 4 Phillips Thrd Ct 23 642432 4 Screw 6 x 1 2 Phillips AB 642662 4 Screw 6 x 3 8 Phillips Thread Cutting 25 643652 Used in Trainer Case Conversion Section on page 35 QTY DESCRIPTION PA...

Page 4: ...ve value is 10 x 1 000 10 000pF or 01 F The letter K indicates a tolerance of 10 The letter J indicates a tolerance of 5 For the No 0 1 2 3 4 5 8 9 Multiply By 1 10 100 1k 10k 100k 01 0 1 Multiplier N...

Page 5: ...ered must be heated sufficiently so that the solder flows freely Apply the solder simultaneously to the component lead and the component pad on the PC board so that good solder flow will occur Be sure...

Page 6: ...rew and a fiber washer 5 INSTALL COMPONENTS TO PC BOARD Install the four L brackets in the positions shown in Figure A Mount them into position as shown in Figure B Figure A Figure B Place the top pan...

Page 7: ...C Mount the PC board with four 4 40 x 1 4 machine screws see Figure D Do not tighten the screws 4 40 x 1 4 Thread Cutting Screws 4 40 x 1 4 Thread Cutting Screws Back Panel Figure C Right Side Left Si...

Page 8: ...in Figure G using a 6 32 x 5 16 screw and 6 32 nut Solder Lug Mica Side Panel Insulator Washer 6 32 x 5 16 Machine Screw Take a small amount of silicone grease from the packet and apply it with a too...

Page 9: ...e right side panel as shown in Figure H Insert the pins of each IC into the holes in the PC board Then with the hardware shown in Figure FA attach each IC to the side panel Solder the pins of the ICs...

Page 10: ...ck that the pin is inserted all the way in It should not pull out of the housing The locking tabs should be bent outward to hold the pin in the housing TRANSFORMER WIRES 1 Strip the insulation off of...

Page 11: ...side of the panel see Figure L Put the two bredboards together as shown in Figure Ka When mounting the bredboard use the holes shown in Figure Kb Mount the plastic spacer with a 4 40 x 1 4 flat head s...

Page 12: ...Spacer 4 40 x 1 4 Flat Head Screw Top Panel Bredboard 4 x 1 4 AB Screws Figure L REGULATED POWER SUPPLY GND 12 12 5 OFF ON 30VAC 15VAC c d e f g h i j 1 5 10 Figure M 15VAC 11 20VDC 20VDC...

Page 13: ...er piece of shrink tubing Cut the 2 section of 3 16 diameter shrink tubing in half to create two 1 sections Slide a 3 16 diameter piece of shrink tubing over the loose end of the red wire Attach the r...

Page 14: ...than 1 4k 27 GND 5 pin connector 5V Regulator GND less than 1 28 GND 5 pin connector 12V Regulator GND less than 1 29 GND 5 pin connector 12V Regulator GND less than 1 10 15 12V Regulator Input less t...

Page 15: ...onnector left 5 pin connector 20 5 pin connector right 5 pin connector 20 GND Ground 29 16 24 15 28 23 9 8 7 6 5 4 10 11 12 13 14 20V Pot 20V Pot Plug of line cord Figure O B1 LM 7812 LM 7912 LM 7805...

Page 16: ...D 12V Regulator Output 12V 16 GND 12V Regulator Input 21V B2 GND 12V Regulator Output 12V 17 GND 5V Regulator Input 12 5V B4 GND 5V Regulator Output 5V 18 GND 20V Regulator Input 28V 25 GND Voltage AD...

Page 17: ...the 25 10 watt resistor across the output terminal The voltage should stay within 20 volts of the no load voltage TROUBLESHOOTING CHART This chart lists the condition and possible causes of several m...

Page 18: ...th load 1 Check capacitor C2 1000 F is inserted in the correct polarity 2 Check ripple on pin 1 of U2 7VP P Max A Capacitor C2 or diodes D1 D3 defective No 12V at output 1 Measure an AC voltage of 15V...

Page 19: ...only one direction The arrow in Figure 3 points to the direction that the current will flow Only when the transformer voltage is positive will current flow through the diodes Figure 3 shows the simple...

Page 20: ...ransistor Q5 is called the pass transistor It controls the current reaching the output Transistor Q3 and Q4 are emitter followers Their function is to raise the impedance of the pass transistor Note t...

Page 21: ...20 SCHEMATIC DIAGRAM POWER SUPPLY SECTION REV E...

Page 22: ...ge is smoothed by using a A half wave rectification circuit B small value capacitor with a high voltage value C Large value capacitor D 90O out of phase 6 An inefficient rectification circuit usually...

Page 23: ...unction 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 ci...

Page 24: ...2 U6 Pin 3 U10 Triangle Wave VR5 CCW 14 7k Pin 2 U6 Pin 3 U10 Triangle Wave VR5 CW 4 7k Pin 13 U6 Pin 14 U6 Triangle Wave Greater than 1k SET SW3 TO SINE WAVE From To Circuit Ohms Resistance Measured...

Page 25: ...6 GND 12V Pin 7 U10 GND B1 U10 Vcc 12V Pin 4 U10 GND B1 U10 Vcc 12V TESTING THE FUNCTION GENERATOR Note Use the knobs when turning the switches TESTING THE SINE WAVE 1 Set your meter to the 200mV DC r...

Page 26: ...alled correctly Also check it and the parts connected to it for good solder connections PROBLEM POSSIBLE CAUSE No wave form at FREQ 1 Check voltage at pins 4 12V and 12 12V of U6 2 Check for wave form...

Page 27: ...D timing capacitor circuit 2 Increasing the current of the VCO will effect the A amplitude B DC offset C AM modulation D frequency 3 The RC time constant is determined by A pins 5 and 6 B voltage con...

Page 28: ...27 SCHEMATIC DIAGRAM ANALOG SECTION...

Page 29: ...e helpful 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 eight LED indicator lamp...

Page 30: ...E FREQ control 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 et...

Page 31: ...SW7 GND In down position less than 1 SW8 GND In down position less than 1 SW1 GND In up position greater than 3k SW2 GND In up position greater than 3k SW3 GND In up position greater than 3k SW4 GND...

Page 32: ...position 5V SW6 GND In up position 5V SW7 GND In up position 5V SW8 GND In up position 5V X GND In down position less than 1V X GND In down position 5V Y GND In down position less than 1V Y GND In dow...

Page 33: ...s to be checked The output of the switches are 5V or ground depending on the position Connect a wire to the SW1 test pin and the A test pin The A LED should light when the switch is placed toward the...

Page 34: ...the waveform control and 10 on the Coarse Frequency control see Figure U If the knobs are loose on the shafts insert a screwdriver into the slot and expand the slot slightly see Figure W Turn the shaf...

Page 35: ...wn in Figure Y Then insert the strain relief into the hole Lay the trainer inside of the case as shown in Figure Z Align the holes in the bottom case with those in the trainer and secure it into place...

Page 36: ...tput goes high Opening and closing the ground at X will not change the output Only when X is grounded will the output change to low Thus only one output change is produced with one movement of the X s...

Page 37: ...36 SCHEMATIC DIAGRAM DIGITAL SECTION...

Page 38: ...output is high D all of the above 5 The logic switches use A single pole single throw switches B double pole double throw switches wires as single pole double throw switches C two pole 5 position rot...

Page 39: ...92612 CAPACITORS QTY SYMBOL VALUE DESCRIPTION PART 1 C27 5pF 5 Discap 205010 1 C26 22pF 22 Discap 212210 1 C23 100pF 101 Discap 221017 1 C18 001 F 102 Mylar 231017 1 C25 0022 F 222 Discap 232216 1 C19...

Page 40: ...Elenco Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com e mail elenco elenco com...

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