FiveFish Studios PSU-2448mk2 Assembly Manual Download Page 21

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PSU-2448mk2 Power Supply Kit

PSU-2448mk2 Parts List

Part

Value

Notes

IC1,IC2

LM317 Regulator

1.5Amp Voltage Regulator (POSITIVE)

IC3

LM337 Regulator

1.5Amp Voltage Regulator (NEGATIVE)

D1,D2,D3,D4,D5,D6

1N4004 Diodes

RECT1, REC72

W02G bridge rectifier

LED1,LED2,LED3

LITE-ON LED RED

See instructions for correct orientation.

3K57

R2, R4, R5

220R

R3, R6, R7

5K Top-adjust trimmer

R8, R9

10K

R10

22K

C1, C18

1000uf 80V Electrolytic

Snap-in type

C3,C16,C17

10u 63V Electrolytic

C4,C14,C15

1u 63V Electrolytic

C6, C7

100uf 100V Electrolytic

C8,C9

1000uf 50V Electrolytic

C2,C5,C10,C11,C12,C13

0.1u 100V ceramic

F1, F2, F3

0.8Amp Fuse

For use with 30VA trafo

Fuse Clips

Fuse clips

6 pcs

H1,H2,H3

Heatsinks for TO-220

Note: Do not allow to touch each other.

PCB

PSU-2448mk2 PCB

www.fivefishstudios.com

Page 21

Summary of Contents for PSU-2448mk2

Page 1: ...city Counts Detail Matters No part of this document may be reproduced either mechanically or electronically posted online on the Internet in whole or in part without the expressed written permission of FiveFish Studios This document is solely provided to the kit builder of the PSU 2448mk2 Power Supply Kit ...

Page 3: ... and top silkscreen component labels This Power Supply is designed to work with the SC 1 SC 1mk3 X 12 Mic Preamp Kit or any other opamp preamp project requiring a split power supply Each voltage rail output is continuously adjustable via it s own trimmer The V and V outputs can be adjusted for 15 16 18 24V projects Or any voltage you want The 48V DC output used for phantom powering can be finely a...

Page 4: ... and BROWN wires together Connect both across the 110V line Secondary Wiring On the secondary side we need to connect the RED and ORANGE together this will be the center tap wire CT The center tap wire will connect to the CT pad on the PCB Connect the BLACK wire to AC1 on PSU PCB Connect the YELLOW wire to AC2 on PSU PCB 220 VOLT OPERATION For 220V operation we need to connect the 2 primaries in s...

Page 5: ...PSU 2448mk2 Power Supply Kit Connect the BLACK wire to AC1 on PSU PCB Connect the YELLOW wire to AC2 on PSU PCB Page 5 ...

Page 6: ...ect and you may damage the small parts 2 Mini Pliers Cutter to cut component leads wires strip insulation off wires if you don t have a wire stripper tool 3 Mini Long Nose Pliers to bend component leads use as a heatsink hold components tighten bolts 4 Manual Solder sucker pump sucks up solder when you made a mistake soldering components on the PCB Primitive operation but it works kind of 5 Multit...

Page 7: ...ike resistors uniformly and evenly 3 PanaVise to hold PCB while you re working on it 4 Tweezers to pick tiny things 5 Masking tape to hold components on the PCB while working 6 Wire stripper for cutting wires and stripping its insulation PSU 2448mk2 Assembly Guide Step 1 Solder all resistors and diodes to the PCB Each resistor value is marked in it s own zip lock bag IMPORTANT The white band of al...

Page 8: ...ic capacitors to the PCB These are the small yellow components Step 3 Solder the bridge rectifiers RECT1 and RECT2 These are the small circular components that have a chopped off side Note the proper orientation Follow the guide printed on the PCB Page 8 ...

Page 9: ...he LEDs are located under the fuses The LEDs require the proper polarity for it to work It has a Terminal and a Terminal See the photo below on how to mount the LED correctly Note the Short Leg and Long Leg of the LED and insert it in the orientation shown below Page 9 ...

Page 10: ...s as close as possible to the PCB board so its height would not interfere with the fuses Note You may wire one of the LEDs to a front panel LED indicator lamp instead Use the Panel Mount LED that came with your 1u Power Transformer Kit Page 10 ...

Page 11: ...gs One side will be marked as This is the Negative terminal Install the capacitors with the negative terminal inserted at the bottom hole To lessen chances of errors all capacitors are oriented in the same direction Negative terminal down Step 6 Solder the trimmer resistors Note orientation of trimmer resistors Page 11 ...

Page 12: ...PSU 2448mk2 Power Supply Kit Step 7 Solder the medium sized 100uf electrolytic capacitors Step 8 Solder the tall 1000uf 50V electrolytic capacitors Page 12 ...

Page 13: ...r aesthetic reasons keep all their height at the same level The flat side i e metal side of the regulators should be facing out towards the top edge of the PCB VERY IMPORTANT Please note that the three voltage regulators look the same but are DIFFERENT The positive voltage regulator is an LM317 and the negative voltage regulator is an LM337 DO NOT INTERCHANGE the two regulators or you will damage ...

Page 14: ...PSU 2448mk2 Power Supply Kit Using the photo below as a guide from LEFT to RIGHT the regulators are LM337 LM317 LM317 Page 14 ...

Page 15: ...gulators Note You don t need to install insulators Just make sure the 3 heatsinks do not touch each other or the metal part of your case Otherwise you ll be creating a short and destroy your regulators IMPORTANT If you want all voltage regulators mounted on one single big heatsink then you MUST use TO 220 insulators to mount them Page 15 ...

Page 16: ...e other end is open The closed end of the fuse clips should be mounted as shown below The open ends of the fuse clips should be facing each other so you can later mount the fuse cartridge later Step 12 Insert the 3 Fuses into the fuse holder clips And we re done Next step is connecting the PSU PCB to our power transformer and adjusting the output voltages Page 16 ...

Page 17: ...be the center tap wire CT The center tap wire will connect to the CT pad on the PCB The CT pads are the 2 middle pads on the PCB AC input Connect the BLACK wire to AC1 on PSU PCB Connect the YELLOW wire to AC2 on PSU PCB OPTIONAL The PSU kit uses standard 0 1 spaced pads for all input and output connections so you can use MOLEX PCB connectors as pictured above Molex connectors are not included in ...

Page 18: ...rease the voltage 2 Next measure the voltage across V and GND pads Adjust the middle trimmer R6 to at least 20V at the outputs Turn the screwhead COUNTERCLOCKWISE to Increase the voltage 3 Next measure the voltage across V and GND pads Adjust the rightmost trimmer R7 to get 20V at the outputs Turn the screwhead COUNTERCLOCKWISE to Increase the voltage Note since this is a supply increasing the vol...

Page 19: ... protection of the voltage regulator isn t enough Thus when a short circuit happens say the V or 48V is accidentally shorted to GND the voltage regulator may fail A common symptom of a failed voltage regulator is it won t adjust no matter how you turn the trimmers or it would only output a small voltage The fix is removing the faulty voltage regulator and installing a brand new one The desoldering...

Page 20: ...ENED to protect the PSU from the 48V short PHOTO 3 Replacing the fuse with a brand new one shows that we have 48V power back again with no damage to the voltage regulator NOTE It is a good idea anyway to avoid shorting any of the power supply output voltage rails to ground The above is just a demonstration IMPORTANT 110V 220V Mains power safety fuses should still be installed when wiring your powe...

Page 21: ... for correct orientation R1 3K57 R2 R4 R5 220R R3 R6 R7 5K Top adjust trimmer R8 R9 10K R10 22K C1 C18 1000uf 80V Electrolytic Snap in type C3 C16 C17 10u 63V Electrolytic C4 C14 C15 1u 63V Electrolytic C6 C7 100uf 100V Electrolytic C8 C9 1000uf 50V Electrolytic C2 C5 C10 C11 C12 C13 0 1u 100V ceramic F1 F2 F3 0 8Amp Fuse For use with 30VA trafo Fuse Clips Fuse clips 6 pcs H1 H2 H3 Heatsinks for T...

Page 22: ...PSU 2448mk2 Power Supply Kit PSU 2448mk2 PCB Component Layout Guide Page 22 ...

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