PSU-1848/2448 Power Supply Kit Regulated Split Power Supply With +48V Phantom Power

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1 PSU-1848/2448 Power Supply Kit Regulated Split Power Supply With +48V Phantom Power Simplicity 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-1848/2448 Power Supply Kit. Copyright 2007 FiveFish Studios Last Update: 12/21/07

2 Page 2 PSU-1848/2448 KIT Power Supply for the SC-1 Mic Preamp Kit and other OpAmp, InAmp based projects Assembly Guide Rev 4.0 This is a split power supply designed to give positive and negative voltages and +48V phantom power. It has a small form factor, measuring only 3.5 (W) x 1.9 (H). The PCB is professionally manufactured, with double-sided copper, plated-through holes, and top silkscreen component labels. This is designed to work with the SC-1 Mic Preamp Kit, or any opamp preamp project. Specs: Regulated Voltages Output Range (using PWR-TRAFO kit transformer) Output 1: 20 Volts to 48+ Volts Output 2: 1.2 Volts to 21+ Volts (up to 25+ Volts for PSU-2448 mod) Output 3: -1.2 Volts to -21+ Volts (up to 25+ Volts for PSU-2448 mod)

3 Page 3 PSU-1848 Power Supply Kit A power transformer is required. DO NOT CONNECT THE 110/220 AC LINES DIRECTLY TO THE PCB. For this discussion, I'm assuming you're using the 1U or 2U PWR-TRAFO kit that I'm selling. STOP! READ THE DIRECTIONS BELOW: First, determine which power transformer kit you have. I supply (2) kinds of Power Transformer Kits. Look at the photos below. If you are using a different brand/model of transformer, please consult the manufacturer for their documentation. 1U PWR-TRAFO KIT USING THE 1U PWR-TRAFO KIT TRANSFORMER (photo shown above) 110 VOLT OPERATION 2U PWR-TRAFO KIT USING THE 2U PWR-TRAFO KIT TRANSFORMER (photo shown above) 110 VOLT OPERATION For 110V operation, we need to connect the primaries in parallel. Connect the BLUE and VIOLET wires together. Connect the GRAY and BROWN wires together. Connect both across the 110V line. For 110V operation, we need to connect the 2 primaries in parallel. Connect the (2) RED wires together and connect the (2) BLACK wires together. 110V is applied across the RED and BLACK wire.

4 Page VOLT OPERATION 220 VOLT OPERATION For 220V operation, we need to connect the 2 primaries in series. Connect the GRAY and VIOLET wires together. 220V is applied across the BLUE and BROWN wires. For 220V operation, we need to connect the 2 primaries in series. Connect the RED and BLACK wire together (that are beside each other see diagram above). 220V is applied across the outer RED and BLACK wires... (see diagram above) For Both 110V or 220V OPERATION 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. For Both 110V or 220V OPERATION On the secondary side, we need to connect the BLUE and GREEN wires that are beside each other. (see diagram above this will be the center-tap wire CT). The center-tap wire will connect to the CT pad on the PCB. Connect BLUE wire to AC1 on PSU PCB. Connect the GREEN WIRE to AC2 on PSU PCB.

5 PSU-1848 Power Supply Kit Page 5 Circuit Operation: RECT1 is a bridge rectifier for the 48V section that converts the input AC voltage to DC. C1 and C2 is a filter capacitor that filters the ripple voltage after the rectifier. This filtered DC voltage then goes to IC1, which is a 3-terminal adjustable voltage regulator. The values for R1, R2 and R3 are chosen so that you can achieve a +48V output. R3 is a trimmer resistor that is used for fine-tuning the output voltage. D1 and D2 are diodes that protect the IC1 voltage regulator. C3 is added for stability, along with bypass capacitors C4 and C5. C18 is another filter capacitor to further reduce ripple from the 48V section. Since the 48V output will be used for phantom power, we want it to be as clean as possible to prevent the mic preamp from amplifying any ripple/hum in the supply. RECT2 is another bridge rectifier for the split supply section. C8, C9 are filter capacitors to smoothen out the ripple. C10 and C11 are bypass capacitors, along with C12, C13, C14 and C15. IC2 is a positive 3 terminal voltage regulator while IC3 is it s counterpart negative 3 terminal voltage regulator. D3, D4, D5, and D6 are protection diodes for the regulator. Resistor values R4, R5 are chosen so IC2 and IC3 (along with resistors R6 and R7) will supply +/-18Volts. R6 and R7 are trimmer resistors used for adjusting the output voltage. Resistors R8 and R9 are current limiting resistors for LED1 and LED2. You can solder LEDs to the PCB as a visual reminder if the board is powered up. Or, you can to mount your LEDs to your front panel as a visual indicator for the (+) and (-) supply voltage. Basic Tools Required A few basic tools are required to build this kit. 1. Soldering iron adjustable temperature recommended, but not necessary. Your soldering iron must have a sharp conical tip. I do not recommend a flat-head, screwdriver-type soldering iron. DO NOT USE A SOLDERING GUN. They are usually rated at 100Watts and are overkill for this project. 2. Mini Pliers Cutter to cut component leads, wires, strip insulation off wires (if you don t have a wire-stripper tool).

6 Page 6 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. Multitester A simple meter/tester to measure resistance, and voltages. A digital read-out is a big help. 6. Soldering Lead 60/40 lead or lead-free solder 7. Magnifying glass to see what you re doing! 8. Clean and well-lighted work area Lots of good lighting, clean work area. You want to be able to leave your work-inprogress without packing everything away. Extra Tools (Nice to have, but not required) 1. Vacuum desoldering pump if you make a mistake, you need to pull out the component from the PCB 2. Component lead bender bend component leads like 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

7 Page 7 PSU-1848/2448 Assembly Guide Follow these instructions to assemble your PSU-1848 Power Supply. Bend the component leads like the photo shown below before inserting them to the PCB. For diodes, allot a small clearance before bending the leads. Step 1. Solder all resistors and diodes to the PCB. (R1, R2, R4, R5, R8, R9)

8 PSU-1848 Power Supply Kit White band of diode is oriented on top. Step 2. Solder all ceramic capacitors to the PCB. These are the small yellow components. (C2, C5, C10, C11, C12, C13) Page 8

9 Page 9 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. Step 4. Solder LED1 and LED2. (Note: You may wire instead LED2 to a front panel LED indicator lamp, or use the LED that comes in the Power-Transformer Kit). The LONG LEG of the LED should be inserted at the bottom hole. Step 5. Solder all small electrolytic capacitors. (C3, C4, C14, C15, C16, C17) Step 6. Solder the trimmer resistors, R3, R6, R7. Note orientation of trimmer resistors. Step 7. Solder the medium sized capacitors C6, C7. Step 8. Solder capacitors C8, C9. Step 9. Solder capacitors, C1 and C18. These are snap-in type capacitors. You may need to do a slight twising motion when inserting it into the holes. Step 10. Solder voltage regulators IC1, IC2, IC3. For 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. Step 11. Install TO-220 heatsinks to your regulators. Use small nut and bolts to fasten the heatsinks to the regulators. 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. Step 12. Wire the PCB to your power transformers. See the PSU-1848 Wiring Guide below.

10 Page 10 PSU-1848/2448 Wiring Guide 1. Connect AC1, AC2 and CT pads of the PCB to the secondary windings of your power transformer. 2. Connect the (+), (-) and GND to your SC-1 Preamp, or project. 3. Connect the +48V pad to your SC-1 Preamp +48V pad. Note: Before connecting the power supply outputs directly to your project, measure the output voltages first and adjust if necessary. See the section Voltage Adjustment Guide below. PSU-1848/2448 Voltage Adjustment Guide When calibrating/adjusting the output voltage of the PSU-1848/2448, make sure there is a "load" connected to the PSU board. Otherwise, you may get a false reading when turning the trimmer pot. The simplest way to do this is to just solder the (2) on-board LEDS on the PSU-1848 board. 1. Using a voltmeter, measure the voltage across the (+48) and GND terminals. We want a voltage reading of +48Volts if you re using this for the SC-1 Mic Preamp project. You probably won t exactly get 48Volts, so using a small screwdriver, adjust leftmost trimmer R3 to measure 48 volts at the outputs. Turn the screwhead COUNTERCLOCKWISE to increase the voltage. 2. Next measure the voltage across (+) and GND pads. Adjust the middle trimmer R6 to get +18V at the outputs. Turn the screwhead COUNTERCLOCKWISE to Increase the voltage 3. Next measure the voltage across (-) and GND pads. Adjust the rightmost trimmer R7 to get 18V at the outputs. Turn the screwhead COUNTERCLOCKWISE to Increase the voltage Note... since this is a (-) supply, increasing the voltage will direct you towards (0) zero volts. You'd want to decrease the voltage (i.e. turn CLOCKWISE) to adjust the voltage to -18Volts. 4. DONE! FINISH! Power off, then connect the (+), (-), GND and +48V pads to your SC-1 preamp or project. Note: After connecting your preamp/load to the PSU you may want to re-check the output voltages just to be sure. Re-adjust if necessary.

11 Page 11 PSU-1848 Modifications for +/-24Volts Output (i.e. a PSU-2448) The PSU-1848 PSU can be modified for a higher +/-24V max output... useful if you're powering a Neve clone or some vintage gear that requires a higher voltage than +18V. And of course, +48V phantom power is still available. The modifications are as follows: R4 and R5 needs to be changed to 220 ohms R6 and R7 trimmer needs to be changed to 5Kohm.

12 PSU-1848 Power Supply Kit Page 12 Photos Note the placement of the heatsinks. You need a 4-40x1/4 screw and a 4-10 hex nut to install the heatsinks to the TO-220 regulators.

13 Page 13 PSU-1848/2448 Parts List Part Value Notes IC1,IC2 IC3 D1,D2,D3,D4,D5,D6 RECT1, REC72 LM317 Regulator LM337 Regulator 1N4004 Diodes W02G rectifier LED1,LED2 LITE-ON LED RED Clear red R1,R8,R9 3K3 R2 220R R3 5K TRIM Bourns top-adjust trimmer R4,R5 120R For +/-24V output, use 220R for R4,R5 R6,R7 2K TRIM Bourns top-adjust trimmer For +/-24V output, use 5K TRIM for R6,R7 C1, C uf 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 H1,H2,H3 Heatsinks for TO-220 PCB PSU-1848 PCB PSU-1848 PCB Component Layout Guide Note: The long lead of the LED should be inserted at the bottom hole.

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