20626 (JE215)
Contents
1. Note extension lead not required if lead of one end of capacitor is long enough to solder on the board not long enough gt lt to solder on board PCB BOARD IC1 and IC2 Adjustable Voltage Regulator 0 400 Recommended lead spread for voltage regulator For datasheets of part number 23579 LM317T and 23819 LM337T please proceed to our website at www jameco com Component lead bending and clippling L Bend leads slightly to keep components on the board before soldering Solder leads and clip excess material Soldering Tips 1 Feed the solder to the crack between the iron tip and the solder pad next to the component lead 2 Leaving the iron tip too long on a pad will cause the pad to lift as well as damage the component Allow approximately 2 seconds per solder joint 3 Using too much solder can cause the solder to bridge across traces and pads 4 Keep iron tip clean by wiping tip across a water dampened sponge frequently Assembly Instructions READ ALL THE INSTRUCTIONS BEFORE STARTING 1 Printed wiring board assembly See assembly figure 1 figure 2 and figure 3 1 1 Start the board assembly by placing the printed circuit board to the position shown on the assembly picture see figure 1 component side figure 2 solder side 1 2 Insert diodes thru as shown The polarity band on each of the diodes m2. 2 Everything functions except for LEDI which does not light up 2 reverse lead mounting led anode and cathode side could be backwards 3 Output voltage problems 3 1 regulators and IC2 are reversed Possible permanent damage If unsure of pin configuration please proceed to our website for datasheet and IC2 regulator refer to figure for proper placement on and IC2 on PCB board 3 2 A output voltage stays high open connections in R3 and R4 terminals check for soldering joints B output voltage stays low and does not change shorted R3 and R4 terminals check for solder bridging 3 3 Output varies and 15 difficult to adjust check for placement reversal of C3 and C4 and R3 CR3 and CR4 4 Output voltage drops under load 4 1 check capacitors and C2 for proper value and correct polarity 20626 JE215 Adjustable Power Supply Kit Important disclaimer to the fullest extent permitted by applicable law Jameco expressly disclaims the implied warranty to fitness for a particular purpose Customer should understand that Jameco does not may any representation that products purchase will suit customer s particular purpose Customer must rely on own customer s skill or judgement in selecting sutable products for customer To the extent any implied warranty is applicable such warranty shall be limited to 90 days from date of purchase Limitation of liability Jameco s liability shall b
3. VA AC INPUT V GND 1N4001 Transformer Input C3 Transformer 1N4001 Input GND R4 V AC INPUT R2 180 ohms C2 144001 Heatsink Mounting Holes IC1 LM317T AC Input Input Leads of Transformer Input Leads of Transformer AC Input Center Tap Lead of Transformer Mounting Holes of Heatsink Mounting Holes of Heatsink PRINTED CIRCUIT BOARD SOLDER SIDE FIGURE 2 Note C1 and C2 are 2200uF o 35V 2 EA 1 C2 Q LA IC2 93 84 2 5K LM337T D 2200MF 16 EQ LM337T RES ADJ J 6 557 NOTE FLAT T VOLTAGE ADJ SURFACE PWR CORD i winE OH OPT FOR SWITCH BUMPER FEET 1N4001 LM3ITT NOTE POLARITY POS REG BAND LOCATION COMPONENT LAYOUT COMPONENT SIDE OF PRINTED CIRCUIT BOARD FIGURE 3
4. JAMECO ELECTRONICS QTY PART NO DESCRIPTION 20626 JE215 Adjustable Dual Power Supply Kit 1 2 2 4 1 1 2 2 1 1 2 1 2 6 2 2 23579 23819 609705 33662 35975 94511 690865 690689 35503 42042 29226 42622 20642 40970 42446 42463 40943 Regulator Adj Pos LM317T Regulator Adj Neg LM337T Capacitor Electrolytic 2200uF 35V Capacitor Tantalum 1uF 35V Diode 1N4001 Red T1 34 LED Diffused Lens Watt 1k ohm brown black red Watt 180 ohms brown gray brown 74 Watt Potentiometer 2 5k ohms 6 foot power cord AWG 18 2 Power Transformer 12 6VCT 2A Heatsink THM6030 or Equivalent Printed Circuit Board JE215 1 Screw PH 4 40 x 3 8 Screw PH 6 32 x 3 8 Washer split lock 6 Hex Nut 4 40 4 O 42420 Hex Nut 6 32 32011 Rubber bumper feet SJ5012 or equivalent 20634 Kit instructions for JE215 General Description iN The 20626 is a dual power supply with independent adjustable positive and negative output voltages A separate adjustment for each of the supplies provides the user unlimited applications for IC circuit voltage requirements The supply can also be used as a general all purpose variable power supply Assembly Preparation and Procedures 1 Important Identify all parts on parts list before proceeding Adjustable regulated power supplies positive and negative 1 2VDC to 15 VDC Power output each supply 5VDC 500mA 750mA 1
5. 2VDC 500mA and 15VDC 750mA Two 3 terminal adjustable regulators with thermal overload protection Heat sink regulator cooling 2 Suggestions simulate board assembly by placing the components in their actual place on the picture assembly see figure 1 or figure 3 then transfer components to the actual board during assembly 3 Tools required small soldering iron 27 watt to 35 watt resin core solder 0 3 diameter SN60 or SN63 Do not use acid core type or 50 50 solder small sponge water dampened for cleaning solder tip small wire cutter and stripper small long nose pliers screw driver plastic electrical tape multimeter that can read resistance capacitance and voltage preferably digital Component wire stripping bending and lead spreading T1 Power Transformer OUTPUT SIDE 12 6VCT 2A with RED wire as center tap Opposite side of transformer are two yellow wires input side for 115VAC input d UN m S Black wire default length 8 with 0 4 stripped and tinned end Blue wire default length 8 with 0 4 stripped and tinned end Red wire center tap default length Recommend to cut wires on power 8 with 0 4 transformer to 3 5 in length strip 4 twist stripped and bare wires and tin note do not cut the tinned end wires while stripping C1 and C2 Electrolytic Capacitor Overlap and solder the cut lead if lead length
6. ds 1 9 Insert light emitting diode LEDI Note the polarity lead which is 1s the flat side of the LED placement Adjust the LED by leaving approximately 34 of leads above the board Solder and clip excess leads 1 10 Insert adjustable resistors R3 and R4 AII leads must be straightened before installing Mount resistor body flush to the board component side Solder and clip excess leads Assembly Instructions continued 1 11 Install jumper wire as show on figure and figure 2 option for a switch Use clipped component lead wire Solder and clip excess leads 1 12 Strip power cord insulation back about 4 Twist wire leads and insert into location as shown see figure 1 and figure 2 Bend twisted wire leads of power cord flush against the solder pads and solder As a safety precaution against electrical shocks place two layers of 34 wide plastic electrical tape over the 120V AC input traces A cable clamp may be used secured by the transformer to relieve the strain on the power cord leads 1 13 Insert 4 no 6 screws from the bottom of the board for the output terminals as shown see figure x Tighten the first nut 4 on top of the board Hand tighten the second nut 4 over the first 1 14 Place bumper feet 4 approximately as shown see figure x to the bottom of the board 1 15 Cut power supply indent Labels from instruction sheet glue or tape the board as shown see figure x 2 Final Assembly Do no
7. e limited to the repair or replacement of defective products in accordance with the Jameco limited warranty Jameco shall not be liable for any incidental special or consequential damages for breach of any warranty expressed or implied directly or indirectly arising our ot Jameco s sale of merchandise including any failure to deliver any merchandise or arising out of customer s installation or use whether proper or improper of the product separately or in combination with other equipment or from any other cause Warranty Jameco warrants the equipment to be free from defects for a period of 90 days from date of purchase If found to be defective these products will be replaced with a new unit not repaired No units will be accepted past the 90 day warranty for repair or replacement There is no charge for any replacement Equipment or parts which have been subject to misuse accident alteration neglect and or unauthorized repair are not covered by the warranty Seller shall have the right to final determination as to existence and cause of defect SCHEMATIC DIAGRAM S IN OUT p IC1 ADJ gt O C3 C1 cns D 0 ed R3 2 3 JW1 a CR2 A A CR4 4 2 IC2 IN OUT PRINTED CIRCUIT BOARD COMPONENT SIDE Center Tap Lead of FIGURE 1 Transformer Heatsink Mounting Holes R3 IC2 LM337T R5 180 ohms
8. t attempt to plug in the power cord until a final check has been made to verify the correctness of all assembled components Components and IC2 will be permanently damaged if their placement 15 accidentally swapped and diodes and CR2 will blow if their polarity placement 15 reversed Place a check 4 in each of the circles on the assembly picture as you go over each component Power Supply Voltage Adjustment 1 The Kit 20636 JE215 power supply voltage can be varied by turning adjustable resistors R3 for positive power supply and R4 for negative supply see figure 1 for location of R3 and RA Use DC voltage meter for correct voltage setting 2 For dual adjustable positive or dual negative outputs reverse the leads on one of the supplies However when used in this manner each of the load must be in separate use 1 e not electrically connected together Safety Notes 1 Never use the power supply on metal surfaces 2 Allow adequate air ventilation to cool 3 Unplug power cord when not in use Trouble Shooting Tips 1 No voltage outputs across terminals 1 1 A check power cord for correct wiring and 115V AC on printed board pads B check for 12 6VCT on secondary leads of transformer T1 C check for improper placement of and C2 polarity should have approximately 18 5 VDC when measure across each capacitors D check for polarity on diodes CRI to CR4 diodes will blow if polarity bands are placed backwards
9. ust be placed as shown on the assembly see figure 1 component side and figure 2 solder side Mount all diodes 1 8 above the board Solder and clip leads 1 3 Insert resistors R1 R2 and R5 see figure 1 Be sure that the color coded values are properly placed Solder and clip leads 1 4 Insert capacitors C3 and C4 Be sure that the positive polarity lead on each of the capacitors 1s placed correctly on the printed circuit board Solder and clip leads 1 5 Install transformer T1 by first inserting the leads into the board before securing it down with the hardware The CT center tap lead is different in color in this group of 3 wires and must go into the hole marked see figure 1 1 6 Insert regulators IC1 and IC2 see figure 1 Push leads about 1 8 into the board Do not solder yet Be sure the correct regulator IC is places into the correct position 1 7 Install the heat sinks behind the IC s as shown Push the heat sink into the holes Allow 1 8 of air space between the bottom of the heat sink and top of the board Secure IC s to heatsink using 4 screws hardware Solder IC leads and clip excess leads as required 1 8 Insert capacitors and C2 Be sure that the polarity leads are properly placed in the correct nodes Push the capacitors against the board and bend each leads 90 degrees into the solder trace Solder about 1 8 to 14 of the leads to the solder pad solder side of the board and clip excess lea
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