Data Sheet - Hobby Engineering
Contents
1. shrink tubing as shown in Figure J Red CAUTION DO NOT touch any wires or tubing with the iron O Solder the black transformer wire B aS 3 4 Shrink shown in Figure J to lug 2 on the rocker Tubing switch O Twist the black transformer wire A and the ribbed or flat line cord wire together Solder the two wires to lug 1 on the rocker switch as shown in Figure J O Slide the 3 4 diameter shrink tubing over the switch Flat or Ribbed Line Cord AC Binding Posts Figure J O Slip the 1 2 diameter shrink tubing over the 6 20 ga red wire and the smooth or round line cord wire Solder the line cord wire to the end lug on the fuse holder as shown in Figure J Solder the 6 20 ga red wire to the side lug on the fuse holder Slide the shrink tubing over the fuse holder covering the two lugs O Shrink the 1 2 and 3 4 tubings in place using a hair dryer heat gun at lowest setting or you will melt the tubing or the heat emitting from your soldering iron O Solder the two red transformer wires to the holes marked T2 on the PC board O Solder the black transformer wire to the hole marked CT1 on the PC board O Solder the two blue transformer wires to the holes marked T1 on the PC board O Solder the two yellow transformer wires to the yellow AC output binding posts O Cut a 6 blue wire and strip 1 4 of insulation off of both ends Solder one end of the 6 blue wire and the blue wire from point D t2. 000 milli units 1 unit Maximum Working Voltage 1 000 nano units 1 micro unit unit 1 be Sap kilo 1 000 1 000 units 1 kilo unit mega 1 000 000 1 000 kilo units 1 mega unit CONSTRUCTION Introduction The most important factor in assembling your XP 720K Power Supply 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 Safety Procedures e Wear eye protection when soldering e Locate soldering iron in an area where you do not have to go around it or reach over it e Do not hold solder in your mouth Solder contains lead and is a toxic substance Wash your hands thoroughly after handling solder e Be sure that there is adequate ventilation present 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 of 63 37 alloy DO NOT USE ACID CORE SOLDER What Good Soldering Looks Like Types of Poor Soldering Connections A good solder connection should be bright shiny smooth and uniformly flowed over all surfaces 1 Solder all components from Soldering Iron 1 Insufficient heat th
3. DC converter consists of diodes D1 and D3 and capacitor C5 Transformer T1 has two secondary windings which are 180 degrees out of phase The AC output at each winding is shown in Figure 2A and 2B Voltage Waveform for Supply A Transformer Winding AB aE Half Wave Rectifier B Transformer Winding BC NAN C P Figure 3 iode D1 NN NNNM D Output of diode D2 E Total of diodes Diodes are semiconductor devices that allow current SEa to flow in one direction The arrow in Figure 3 points LPT to the direction that the current will flow Only when i E N E F Output of capacitor C1 I the transformer voltage is positive will current flow Ripple depends on load A through the diodes Figure 3 shows the simplest current expanded Full Wave Rectifier possible rectifier circuit This circuit is known as a half wave rectifier Here the diode conducts only half of the time when the AC wave is positive as shown in Figure 2C Use of this circuit is simple but inefficient The big gap between cycles require much more filtering to obtain a smooth DC voltage Figure 2 Figure 4 By addition of a second diode and transformer winding we can fill in the gap between cycles as shown in Figure 4 This circuit is called full wave rectification Each diode conducts when the voltage is positive By adding the two outputs the voltage presented to capacitor C5 is more complete thus easier to filter as shown in Figure 2E When us
4. Figure M O Fit the cover onto the chassis Fasten in place with two 6 x 3 8 black truss head screws on each side as shown in Figure M k 6 x 3 8 Pan 3 Head Screws 000000 oo0oo0oo0o0o0 O0O0000 O0O0000 O00000 OO0000 6 x 3 8 Truss Head Screws 6 x 3 8 Truss Head Screws 900000 OO0000 O0O0000 O O O00000 OO0000 O00000 im im FI EE Fe FS FT EB UO To SS m M Bottom View Figure M 12 TESTING THE XP 720 POWER SUPPLY Testing the XP 720 Power Supply is very simple Before applying power to the unit be sure that all wiring and soldering is firm If so obtain a digital voltmeter 1 Apply power to the XP 720 and measure the output voltages Output Voltages Positive Variable DC 1 25 16V Negative Variable DC 1 25 16V 5VDC 4 50 5 50 12 6VAC 11 14 2 Short the output of each of the DC outputs to ground one at a time ONLY SHORT THE DC OUTPUTS They should turn off and recover when the short is removed 3 Load Test In making these tests the voltmeter leads should be clipped to the terminal directly and not the load to prevent errors in voltage drop due to contact resistance of the load You can use a lower wattage resistor but only connect it for a few seconds Variable DC Set the voltage to 10V Connect a 10Q 10W resistor from the output to ground The output should not change more than 0 20V 5VDC Connect a 2 5Q 12W resisto
5. Part Qty Description Transformer 440720 L14 Nut 6 32 Small PC Board 512013 12 Nut 8 32 Fuse 1 25A 530125 LI2 Nut 7mm Rocker Switch 541204 LI 1 Nut 6 32 Cover 611120 112 Flat Washer 8mm x 14mm Chassis 612012 112 Lockwasher 5 16 Heat Sink 615010 12 Lockwasher 8 Knob 622009 L114 Rubber Feet Strain Relief 624003 01 Fuse Holder Upper Body Insulator Washer 624007 O1 Fuse Holder Lower Body PC Board Stand off 625001 01 Fuse Holder Hex Nut Black Binding Post 625031 O1 Fuse Holder Washer Int Lockwasher Binding Post 625031LW O3 Mica Insulator Nut Binding Post 625031HN O1 Silicon Grease Red Binding Post 625032 L16 20 Ga Red Wire Yellow Binding Post 625034 L148 22 Ga Red Wire Screw 6 32 x 3 8 Phillips Pan Machine 641640 148 22 Ga Orange Wire Screw 8 32 x 3 8 Phillips Pan Machine 641840 L148 22 Ga Blue Wire Screw 6 x 3 8 black AB Phillips Truss 642652 O11 Line Cord Screw 6 x 3 8 black AB Phillips Pan 642660 O2 Shrink Tubing 1 2 Dia O 1 5 Shrink Tubing 3 4 Dia O1 Solder Tube Part 101804 112701 131500 192422 Part 271045 292226 294744 Part 314001 315400 320070 326124 330317 330337 337805 Part 644601 644800 644101 644600 645101 646101 646828 662001 663005UB 663005LB 663005N 663005W 780002 790005 813210 814201 814310 814610 862105 891101 899110 9ST4 PARTS IDENTIFICATION Resistor 2kQ Potentiometer Capacitor Transistor PC Boa
6. cause a short Black Post Yellow Post Post Post Post Figure K 10 WIRE 2N6124 7805 amp POTENTIOMETERS Insert the wires from the PC board through the rectangular hole in the chassis to the 2N6124 and LM 7805 solder into place as shown in 2N6124 Figure L O0 5 Red wire L from the PC board To middle lead Of 2N6124 O 5 Orange wire P from the PC board to left lead of 2N6124 O 5 Blue wire N from the PC board to right lead of 2N6124 O 4 1 2 Red wire O from PC board to middle lead of LM 7805 O 4 1 2 Blue wire Q from PC board to left lead of LM 7805 anid c k v anid S e6ueo 2 k v POY S bu lo S p d c L v O 4 1 2 Orange Wire M from PC board to right lead of LM 7805 After wiring be sure that the leads do not touch each other and cause a short Solder the wires from the PC board to the potentiometers as shown in Figure L ELENCO ELECTRONICS INC O 4 Red wire E from PC board to middle lug of the positive voltage pot O 4 Blue wire F from PC board to right lug on the positive voltage pot O 4 Orange wire J from PC board to middle Potentiometers lug on the negative voltage pot O 4 Red wire K from PC board to right lug Positive Voltage Negative Voltage on negative voltage pot Figure L 11 FINAL ASSEMBLY O Fasten the heat sink to the chassis with two 6 x 3 8 black pan head screws as shown in
7. of the wires to expose 1 4 of bare wire Tin the leads O Cut the red blue and black wires on the other side of the transformer so that they are 4 in length Strip the insulation off the end of the wires to expose 1 4 of bare wire O Cut the yellow wires to 6 Strip the insulation off the end of the wires to expose 1 4 of bare wire O Install the transformer with the black wires side as shown in Figure J Use an 8 32 x 3 8 screw 8 lockwasher and an 8 32 nut on each side to fasten in place as shown in Figure I O Install binding post 6 see Figure D on page 6 4 Red 4 Red 4 Blue D 8 32 Nut lt 8 Lockwasher 4 1 2 Black 6 Yellow 4 Black 6 Yellow 4 Blue 8 32 x 3 8 Screw Figure H Figure WIRING LINE CORD FUSE TRANSFORMER AND SWITCH O Install the line cord ground lug to the chassis using a 6 32 x 3 8 screw and a 6 32 large 1 2 Tubing 7 nut in the location shown in Figure J fan side Lug O Strip the insulation off of both ends of the ES ae gee 6 red 20 ga wire to expose 1 4 of bare CAA anoh e cer wire Solder one end of the wire to lug 3 on Ribbed the rocker switch as shown in Figure J Line Cord 6006 O Slip the other end of the 6 strip of red wire 6 32 from lug 3 the A and B black 6 32 x 3 8 Large Nut transformer wire and the ribbed line cord screw wire through the 3 4 diameter piece of
8. 17 2V integrated circuit This IC is specially designed to perform the regulation ore oe function Figure 6 shows a simplified circuit of how the LM 317 IC works Sree R1 Transistors Q1 and Q2 form a circuit known as a differential amplifier Transistor Q1 base is connected to a stable 1 5V reference voltage The base of Q2 is connected to the regulator output circuit through a voltage divider network The collector of transistor Q2 is connected to a current source This basically is a PNP transistor biased to draw about 1mA of current Transistor Q2 sees the current source as a very high resistor of about 1 meg ohms Thus the gain of transistor Q2 is extremely high Figure 6 Transistor Q5 is called the pass transistor It controls the current reaching the output Transistors Q3 and Q4 are emitter followers Their function is to raise the impedance of the pass transistor Note that transistors Q2 Q3 Q4 and Q5 and resistor R1 form a close loop Also note that the feedback to the base of Q2 is negative that is when the base of Q2 goes positive the output at emitter Q5 goes negative Now if the 2V output voltage goes down because of current drain at the output the base of Q2 will drop forcing the collector voltage of Q2 to go higher This will bring the output voltage back to 2V This is the basis of all negative regulators Another feature of the LM 317 regulator is to protect the IC against overload and output shorts If the IC is ov
9. POWER SUPPLY KIT MODEL XP 720K 79566 19 00188 83 a Nae gee ee ELENCO lt amp PRECISION AC DC POWER SUPPLY MODEL XP 720 AC VOLTAGE p ETAC q Bavac Assembly Manual Elenco Electronics Inc Copyright 2004 1998 by Elenco Electronics Inc All rights reserved Revised 2004 REV B 753269 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 Electronics 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 Qty 01 O2 2 02 Qty LI15 2 O1 Qty L14 L14 LI 1 LI 1 O1 O1 O1 RESISTORS Symbol Value Color Code R5 180 5 3W R3 R4 2 79 5 1 4W red violet gold gold Ri R2 150Q 5 1 4W brown green brown gold VR1 VR2 2kQ Potentiometer CAPACITORS Symbol Value Description C1 C4 C8 10uF Electrolytic C5 C6 2200uF Electrolytic C7 4700uF Electrolytic SEMICONDUCTORS Symbol Value Description D1 D4 1N4001 Diode D5 D8 1N5400 Diode Q1 A70 Transistor Q2 2N6124 Transistor IC1 LM 317T Integrated Circuit IC2 LM 337T Integrated Circuit IC3 LM 7805CT Integrated Circuit MISCELLANEOUS Description
10. Q2 is biased off until the LM 7805 IC draws about 2A When 2A is drawn by the LM 7805 IC the voltage _ drop across the 3 ohm resistor is 6V enough to turn on transistor Q2 Transistor Q2 takes over and delivers the current to the output Note that if the output voltage goes down the LM 7805 regulator will draw more current forcing the output voltage back to 5V Thus the LM 7805 regulator controls the output voltage and keeps it at 5V Figure 7 Unfortunately this circuit has no control of the output maximum current If the output is shorted to ground transistor Q2 will be overloaded and eventually be damaged The LM 7805 IC will only draw the 2A it was designed to handle and never heat up to turn itself off Another transistor Q1 is added to limit maximum current Resistor R5 is added to sense the current in transistor Q2 When approximately 3A is drawn in transistor Q2 the voltage drop in resistor R5 will turn on transistor Q1 This will force more current in the LM 7805 IC Eventually the LM 7805 IC will overheat turning itself off and thus limiting the circuit at about 3 2A The first 2A of current is drawn by the LM 7805 IC The next 3A are drawn by transistor Q2 Thereafter the current is drawn by the LM 7805 IC until it overheats and turns itself off This is a very effective circuit capable of regulating the output voltage at a constant 5 volts and yet delivering over 3A of current AC Power Supply The section features
11. a 12 6VAC center tapped output Two secondary windings from the transformer are connected directly to the yellow binding posts Connecting from one of the outputs to the center black binding post will give you 6 3VAC The maximum output current for 12 6VAC and 6 3VAC is 1A This concludes the discussion on the operation of the XP 720 Power Supply 16 QUIZ 1 AC voltage is supplied to the rectifier stages by the O A step up transformer O B step down transformer O C 1 to 1 transformer O D AC to DC transformer 2 The secondary windings of the transformer are O A 90 out of phase O B 180 out of phase O C 270 out of phase O D 320 out of phase 3 Diodes allow current to flow O A when the anode is more negative than the cathode O B when the cathode is more positive than the anode O C in one direction O D when a negative or positive voltage is on the anode 4 What circuit is more efficient for rectifying AC to DC Ol A Hartley oscillator O B Half wave O C Schmitt trigger O D Full wave 5 The DC voltage is smoothed by usinga O A half wave rectification circuit O B small value capacitor with a high voltage value O C Large value capacitor O D 90 out of phase rectification circuit 6 An inefficient rectification circuit usually contains O A large gaps between cycles O B twice the AC voltage needed O C more diodes O D all of the above 7 The maximum curren
12. co Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com e mail elenco elenco com
13. e the copper foil side only Component Lead solder will not flow onto the Push the soldering iron tip lead as shown against both the lead and Foil the circuit board foil WALL LLL LLL WLLL Soldering iron positioned incorrectly Circuit Board 2 Insufficient solder let the Soldering Iron solder flow over the connection until it is covered Use just enough solder to cover the connection 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 3 Excessive solder could make connections that you did not intend to between adjacent foil areas or terminals Solder 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 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 oan 4 Here is what a good solder connection looks like el CLL ASSEMBLE COMPONENTS TO PC BOARD Figure A Figure B Figure C Tt Band E Polarity Mark Diodes have polarity Be sure that the band is in the cor
14. ed in 60 cycles AC input power the output of a full wave rectifier will be 120 cycles Capacitor C5 is used to store the current charges thus smoothing the DC voltage The larger the capacitor the more current is stored In this design 2200uF capacitors are used which allows about 3 volts AC ripple when one amp is drawn 14 In practice the current through the diodes is not as shown in Figure 2C Because a Transformer capacitor C5 has a charge after the first cycle the diode will not conduct until the Winding positive AC voltage exceeds the positive charge in the capacitor Figure 5 shows B voitage c1 a better picture of what the current flow looks like assuming no loss in the diode Semen through diodes It takes a few cycles for the voltage to build up on the capacitor This depends on the resistance of the winding and diode After the initial start up there will be a Figure 5 charge and discharge on the capacitor depending on the current drawn by the output load Remember current only flows through the diode when the anode is more positive than the cathode Thus current will flow in short bursts as shown in Figure 5C The DC load current may be one ampere but the peak diode current may be three times that Therefore the diode rating must be sufficient to handle the peak current The 1N4001 has peak current rating of 10 amps Regulator Circuit The regulator circuit in the Model XP 720 power supply consists of a LM 3
15. erloaded the junction of an overload transistor will overheat A transistor will sense this overheating and shut down transistor Q5 15 The LM 317 IC is basically a 1 25V regulator To be able to vary the output 2 15V we stack the IC on a DC voltage as shown in Figure 6A When VR1 equals 0 the output voltage is 2V as determined by the LM 317 IC Note that 1 25 15V the voltage across R1 is always 2 volts When R1 equals VR1 the voltage across VR1 will equal the two volts across R1 therefore the output voltage will be four volts When VR1 is 5 times R1 the output voltage is 12 volts As you Can see varying resistor VR1 will vary the voltage from 1 25V to 15V The Negative Voltage Regulator Figure 6A The theory of the negative voltage regulator is the same as the previously discussed positive regulator The basic differences is that diodes D2 and D4 are reversed producing a negative voltage across capacitor C6 The LM 337 IC is designed to operate from a negative supply The 5 Volt Power Supply In the previous discussion of the variable voltage regulators the ICs can handle about 1A of current In the design of the 5V supply we need 3A of current To meet this current requirement we must add an external pass transistor capable of delivering 3A Figure 7 shows a simplified 5V regulator with an external PNP pass transistor In this circuit transistor Q1 is a power transistor capable of 8 10VDC delivering over 3A Transistor
16. licon Grease B Small 6 32 Nut mn j gt angles with pliers m n j E Install IC1 IC2 and Q2 in the positions ON Cs and Transistor This Side 7 shown in Figure E Fasten in place using the parts shown in Figure F Spread the silicon grease on the back 2N6124 of the transistor and ICs SS O IC1 LM 317T IC O IC2 LM 337T IC Oo Q2 2N6124 Transistor Z Small 6 32 Nut a gt S Install IC3 as shown in Figure Fa Fiqure E Tm H d O IC3 LM 7805T IC J O Mount the fuse holder to the top hole in the back of the chassis with the side lug up as shown in Figure G Fasten in place with the 3 8 nut After the holder is secure unscrew the top and insert the fuse A Insulator Washer IC1 IC2 Heat Sink Q2 Figure Fa 6 32 x 3 8 Screw Insulator Washer Insulator Washer IC3 Heat Sink LM7805T p ly Side Lug O Separate the wires of the line cord 3 from the end Strip the A insulation off the end of all two end wires to expose 1 4 of bare wire 3 gt 1 4 lt O Insert 6 of the line cord into the bottom hole on the back of the chassis as shown in Figure G Place the line cord into the slot of the strain relief and squeeze the two sections together with pliers Then insert the strain relief into the hole O One side of the transformer has only 2 black wires Cut Pliers these wires so that they are 4 1 2 in length see Figure H Strip the insulation off the end
17. nd R4 No AC Output 1 Check the power switch and fuse 2 Check the solder connections to the binding posts 13 CIRCUIT DESCRIPTION Introduction The Model XP 720 Power Supply features three solid state DC power supplies and a 12 6VAC center tapped output The first two supplies consist of one positive and one negative 1 25 to 15 volts at 1 ampere The third has a fixed 5V at 3 amperes All DC supplies are fully regulated A special IC circuit keeps the output voltage within 2V when going from no load to 1 ampere The output is fully protected from short circuits This supply is ideal for use in school labs service shops or anywhere a precise DC voltage is required The AC section has 6 3VAC 1A and a 12 6 center tapped 1A The Positive 1 25 15V Power Supply Figure 1 shows a simplified circuit diagram of the positive supply It consists of a power transformer a DC rectifier stage and the regulator stage 120VAC mpu Transformer 17VAC ACtoDC 20VDC Voltage 1 25 15V 120V to 17V Converter Regulator Regulated Simplified diagram of positive power supply Output Figure 1 Transformer The transformer T1 serves two purposes First it reduces the 120VAC input to 17VAC to allow the proper voltage to enter the rectifier stages Second it isolates the power supply output from the 120VAC line This prevents the user from dangerous voltage shock should the user be standing in a grounded area AC to DC Converter The AC to
18. o the black binding post O Push the PC board stand offs in the four holes in the bottom of the chassis Push the PC board down in place PC Board Chassis WIRE BINDING POSTS AND 317 337 solder the wires from the board to the binding posts as shown in Figure K O 3 Orange wire from G on the PC board To the Yellow post 1 25 15V O 4 Blue wire from H on the PC board and the 6 blue wire from the black AC binding post To the Black post common O 3 Red wire from I on the PC board To the Red post 1 25 15V O 4 Red wire from C on the PC board To the Red post 5V 3A Place the heat sink with ICs and transistor in the position as shown in Figure K Insert the wires from the PC board through the rectangular hole in the chassis to the ICs and solder into place Tin the leads Form the end of the wires into a tight loop for easy tight connection to leads before you apply solder O 3 1 2 Red wire W from PC board To middle lead of LM 317 O 3 1 2 Orange wire S from PC board To left lead of LM 317 O 3 1 2 Blue wire U from PC board To right lead of LM 317 O 3 Red wire R from PC board To middle lead of LM 337 O 3 Blue wire T from PC board To left lead of LM 337 ELENCO ELECTRONICS INC O 3 Orange wire V from PC board To right lead of LM 337 After wiring the ICs be sure that none of the leads touch each other and
19. r from the output to ground The output should not change more than 0 20V Should any of these tests fail please refer to the troubleshooting guide TROUBLESHOOTING GUIDE No 2 15V Output Voltage 1 Check the AC voltage at anode of D1 It should read about 17VAC If not check the fuse transformer ON OFF switch or line cord 2 Measure voltage at output of D1 It should read about 24VDC If not check D1 D3 and C5 3 If 20V is OK check IC1 No Negative Voltage Output 1 Check the voltage at the output of D4 It should be 24VDC Check D2 D4 and C6 and make sure that they are not in backwards 2 If DC is OK then check IC2 No 5V Output 1 Check the voltage across the transformer winding It should read about 12 volts If not check the diode bridge or C7 2 Measure the DC voltage at the output of the diode bridge It should read about 12 volts If not check the diode bridge or C7 3 If DC is OK check IC3 Q1 and Q2 Poor Regulation on any Supply 1 Check DC voltage at the input of the regulator It should be greater than 18 for 2 15V output and 8V for 5V output 2 Check AC ripple at the input of the regulator It should be less than 5V for the variable supply and the 5V supply 3 If the ripple is greater then check the diodes and its filter capacitor Fails to Shut Down on 5V Overload 1 Check transistor Q1 and resistors R3 R4 and R5 Unable to Draw 3 Amps at 5 Volts 1 Check transistor Q2 and resistors R3 a
20. rd Strain Relief PC Board Stand off Nuts Fuse Assembly 7mm 6 32 8 32 Lockwasher 9 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors Resistance Tolerance Multiplier Color Tolerance Redan eee OCH BAND 1 1st Digit BAND 2 2nd Digit Black O Black 0 Red 2 i Red 2 1 000 Red 42 10 000 100 000 Blue 6 J Blue 6 J Blue 1 000 000 0 25 Gray Gray White White BANDS 1 2 Multiplier Tolerance C NT IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF picofarads nF nanofarads or uF microfarads Most capacitors will have their actual value printed on them Some capacitors may have their value printed in the following manner The maximum operating voltage may also be printed on the capacitor n omen OT1 e 4 s e e First Digit Note The letter R may be used at times to signify a decimal point as in 3R3 3 3 Second Digit Multiplier Tolerance The letter M indicates a tolerance of 20 The letter K indicates a tolerance of 10 The letter J indicates a tolerance of 5 The value is 10 x 1 000 10 000pF or 01pF 100V METRIC UNITS AND CONVERSIONS Abbreviation Means Multiply Unit By 1 000 pico units 1 nano unit Pico 000000000001 nano 000000001 l i Se eae micro 000001 1 000 micro units 1 milli unit milli 001 1
21. rect direction Electrolytics have a polarity Mount the transistor with the marking indicating the flat side as shown on the top lead The PC board is marked legend Leave 1 4 between to show the lead position the part and PC board O D5 1N5400 Diode O D4 1N4001 Diode O D6 1N5400 Diode O D3 1N4001 Diode O D7 1N5400 Diode O D2 1N4001 Diode O D8 1N5400 Diode O D1 1N4001 Diode see Figure A see Figure A Q R2 150 Resistor L1R1 150 Resistor orn green brn gold O C1 10uF Electrolytic O C2 10uF Electrolytic O C3 10uF Electrolytic LI C6 2200uF Electrolytic O C4 10uF Electrolytic O C5 2200uF Electrolytic O C8 10uF Electrolytic see Figure B see Figure B LI R3 2 70 Resistor O R4 2 70 Resistor red violet gold gold O C7 4700F Electrolytic O R5 18Q Resistor see Figure B LI Q1 A70 Transistor see Figure C PC BOARD WIRING Cut the 22 gauge wires to the required length Strip 1 4 of insulation off of both ends Insert the lead into the hole and solder it to the foil side O 4 Red O 3 1 2 Red Hole K Hole W O 4 Orange O 3 Orange Hole J Hole V O 3 Red L13 1 2 Blue Hole Hole U O 4 Blue O 3 Blue Hole H Hole T O 3 Orange 13 1 2 Orange Hole G Hole S O 4 Blue O 3 Red Hole F Hole R O 4 Red O 4 1 2 Blue Hole E Hole Q O 6 Blue O 5 Orange Hole D _ lt Hole P O 4 Red LI 4 1 2 Red Hole C Hole O O 5 Bl
22. t that a diode can handle is determined by O A the transformer s current rating O B the amount of AC ripple O C three times the diode rating O D peak current rating 8 The LM 317 will shut down when O A the output voltage is too high O B no current is being drawn O C the junction overheats O D the output voltage drops to 1 25V 9 The LM 317 regulator contains O0 A a pass transistor O B a constant current source O C a differential amplifier O D all of the above 10 The LM 317 is basically O A a1 25V regulator O B a6 25V regulator O C a 2 5V regulator O0 D a negative voltage regulator VO0lqd60 8d 2V 9 0 S G v 0 d c d siamsuy SPECIFICATIONS ON XP 720 POWER SUPPLY Input Voltage 110 130VAC Current Protection 1A Output Voltage 1 1 25 15VDC 1A at 120V input 2 1 25 15VDC 1A 3 5VDC 3A 4 6 3 12 6CTAC 1A Output Regulation 200mV each supply Line Regulation 100mV each supply Ripple Max 5mV rms Current Protection 1A limit 2 15VDC 3A limit 5VDC Short Protection 1A limit 2 15VDC 3A limit 5VDC Output Impedance 025Q each supply SCHEMATIC DIAGRAM vout 2 i 25V TO R2 15V iso IN4O001 cs 2200uF C2 LOuF OCOM 1 10uF c6 2200uF DZ iN4001 A D 04 VIN VOUT i 25V TO iN4001 aed LM337T D5S p8 INS400 Xx4 gt as n RS 2N6124 O 5Y 18 R4 2 7 Icz G1 LM7S05T 1A70 1 z l IN OUT RZ N REV A 18 Elen
23. ue Hole N i O 4 1 2 Orange Hole M O 5 Red Hole L 0 1 2 3 4 5 6 7 Use this ruler to measure the wires when cutting them to their required lengths O Peel off the protective paper from the bottom of the rubber feet and apply one to each corner on the bottom of the chassis as shown ___ gt Feet Feet PANEL ASSEMBLY O Install the binding posts 1 5 amp 7 with the colors in order as shown in Figure D Binding post 6 will be installed on page 7 Remove the large nut and lockwasher Insert the post into the hole and fasten it with the nut and lockwasher Tighten down the nut with pliers O Cut off the tabs on the two potentiometers and install them with the lugs up as shown in Figure D Secure in place with a 5 16 lockwasher 8mm flat washer and 7mm nut O Turn both potentiometer shafts all the way counter clockwise Line up the line on the knobs with the first line on the voltage scale Press knobs onto the shaft of the potentiometers REA wee LI Note the lug configuration on the rocker switch Push the switch into the hole in the chassis with lug 1 on top as shown in Figure D Cut off tabs 5 16 Lockwashers oS w 8 mm Wa S h 7 4 N p ae yi z a r p 5 5 Lockwasher 2 Qo Figure D Rocker Switch 3 i Rear View of Rocker Switch Carefully bend the leads of IC1 IC2 Heatsink f Figure F IC3 and Q2 on the heat sink at right 6 32 x 3 8 m Mica Si
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