AkitikA PR-101 User manual

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PR-101STEREO
PREAMPLIFIER
ASSEMBLYMANUAL
© 2014 AkitikA LLC
All rights reserved
Revision 4p16 November 29, 2014

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Table of Contents
Table of Contents................................................................................................................ 2
Table of Figures.................................................................................................................. 4
Section 1: About This Manual............................................................................................ 5
Who Should Attempt this Project? ................................................................................. 5
Tools you’ll need ............................................................................................................ 5
Helpful Tools.................................................................................................................. 5
Project Overview ............................................................................................................ 5
Important Safety Notes................................................................................................... 6
About Components ......................................................................................................... 6
Recommended Solder..................................................................................................... 6
Warranty ......................................................................................................................... 6
Section 2: About Building the Kit ...................................................................................... 7
Section 3: Building the Power Supply PCB ....................................................................... 8
Component Order............................................................................................................ 8
Install the Diodes ............................................................................................................ 8
Install the non-polarized Capacitors ............................................................................... 9
Install the Not so Tall Polarized Capacitors ................................................................. 10
Install the Fuse and Fuse Holder................................................................................... 10
Install the Tall Polarized capacitors.............................................................................. 10
Install the Regulators and Heat Sinks........................................................................... 11
Install the voltage select jumpers.................................................................................. 12
Install the AGND-BGND jumper................................................................................. 13
These Components Are Not Loaded............................................................................. 14
Power Supply Inspection .............................................................................................. 14
Section 4: Assembling the Tone-Volume-Balance Board................................................ 15
Install the Resistors....................................................................................................... 15
Install the Diodes and Low Profile Capacitors............................................................. 16
Install the Relay and the Manual Pots........................................................................... 17
Install the Tall Capacitors............................................................................................. 18
Install the Electrolytic Capacitors................................................................................. 18
Install the Integrated Circuits and Transistor................................................................ 18
Install the Control Cable Connector ............................................................................. 19
Install the Motor Pots.................................................................................................... 19
Install Tone/Volume Power Wiring.............................................................................. 21
Install Signal Cables ..................................................................................................... 21
Section 5: Assembling the Input Selector Board.............................................................. 23
Install the Resistors....................................................................................................... 23
Install the Small Capacitors.......................................................................................... 25
Install the Diodes .......................................................................................................... 25
Install the Bypass Capacitors........................................................................................ 26
Install the Integrated Circuits........................................................................................ 26
Install the Control Cable Connector ............................................................................. 26
Install the Relays........................................................................................................... 27
Install the Transistors.................................................................................................... 28

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Install the Tall Film Capacitors..................................................................................... 28
Install the electrolytic capacitor.................................................................................... 28
Install J1 and J2............................................................................................................. 28
These Connectors Are Not Populated........................................................................... 29
Install Input Selector Power Wiring ............................................................................. 29
Take a Break................................................................................................................. 30
Section 6: Assembling the Controller............................................................................... 31
Component Side............................................................................................................ 31
Install the Resistors....................................................................................................... 31
Install the non-polarized Capacitors ............................................................................. 32
Install the IC’s and Transistor....................................................................................... 33
Install the Resistor Networks........................................................................................ 33
Install the Ferrite Beads................................................................................................ 34
Install the Control Cable Connectors and Controller Socket........................................ 35
Install the Polarized Capacitors .................................................................................... 36
You’ve Finished this Side of the Controller PCB for Now...................................... 37
Install the Push Buttons ................................................................................................ 37
Install the Infrared Detector.......................................................................................... 38
Install the LEDs ............................................................................................................ 39
Install the Last Two Capacitors .................................................................................... 40
Install the Microcontroller ............................................................................................ 41
Install the Controller Power Wire................................................................................. 41
Section 7: Chassis Assembly and Power Wiring.............................................................. 43
Protect your PR-101...................................................................................................... 43
Install the feet................................................................................................................ 43
Install the IR Detector Window.................................................................................... 43
Install Back Panel Power Connectors and Front Panel Power Switch ......................... 44
Power Wiring................................................................................................................ 44
Section 8: Preliminary Final Assembly............................................................................ 45
Wire and install the front panel input connector........................................................... 45
Install the headphone jack............................................................................................. 45
Install the power supply................................................................................................ 45
Prepare to Test the power supply.................................................................................. 47
Test the power supply................................................................................................... 47
Install the Controller PCB............................................................................................. 48
Connect Power to the Controller PCB.......................................................................... 48
Test the Controller PCB................................................................................................ 48
Test the Remote Control............................................................................................... 49
Connect Power to the Input Selector PCB.................................................................... 49
Test the Input Selector PCB Step 1............................................................................... 49
Test the Input Selector PCB Step 2............................................................................... 49
Connect Power to the Tone Volume PCB .................................................................... 50
Test the Tone Volume PCB Step 1............................................................................... 50
Test the Tone Volume PCB Step 2............................................................................... 50
Section 9: Final Final Assembly....................................................................................... 51
Tone Volume to Input Selector Signal Connections..................................................... 51

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Final Mechanical Assembly.......................................................................................... 52
Section 10: About the Preamp Architecture ..................................................................... 52
Features......................................................................................................................... 52
Block Diagram.............................................................................................................. 53
Table of Figures
Figure 1-Empty the power supply components into a soup bowl....................................... 8
Figure 2-Component side of power supply PCB before loading........................................ 9
Figure 3-Fuse holder body solders into board, installing fuse into lid of fuse holder...... 10
Figure 4-Assembling Heatsink to a Regulator.................................................................. 11
Figure 5-Solder heat sink mounting rods to retain the heat sink...................................... 12
Figure 6-Preparing voltage jumper wires ......................................................................... 12
Figure 7-120 Volt Operation Jumper installation............................................................. 12
Figure 8-240 Volt Operation Jumper installation............................................................. 13
Figure 9-Power Supply before transformer is installed, wired for 120 Volts................... 13
Figure 10-Install AGND to BGND jumper ...................................................................... 14
Figure 11-Silkscreen side of the Tone Volume Board shows component locations ........ 15
Figure 12-Remember to match silk screen and IC orientation mark................................ 18
Figure 13-Identify pin 1 for proper connector installation ............................................... 19
Figure 14-Motor POT wire preparation............................................................................ 19
Figure 15-Motor POT wiring detail.................................................................................. 20
Figure 16-Completed Tone/Volume Board...................................................................... 20
Figure 17-Silkscreen side of the Input Selector Board shows component locations........ 23
Figure 18-Assembled Input Selector board...................................................................... 29
Figure 19-Silk screen of the “component side” of the controller PCB............................. 31
Figure 20-Insert all the IC’s so that the U-shaped indent matches the silk-screen........... 33
Figure 21-10 pin cable conector pinout............................................................................ 35
Figure 22-locating the pins on the 16 pin cable connector............................................... 35
Figure 23-showing socket orientation............................................................................... 36
Figure 24-Switch and LED side of Controller Board....................................................... 37
Figure 25-Forming the leads of a free-standing infra-red detector (left) or installing the
framed IR detector (right)................................................................................................. 38
Figure 26-LED with white spacer added.......................................................................... 39
Figure 27-Retaining LEDs with masking tape.................................................................. 39
Figure 28-Completed controller, push-button and LED side............................................ 41
Figure 29-Install 4 feet with 6-32x1/2" silver colored screws.......................................... 43
Figure 30-Installing power outlets and IEC connector...watch orientation! Installing the
power switch…watch orientation!.................................................................................... 44
Figure 31-Fasten the transformer to the preamp right side wall....................................... 46

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Section 1: About This Manual
This manual gives the information needed to build Akitika LLC’s PR-101 Stereo
Preamplifier.
Who Should Attempt this Project?
You can build this kit if you can:
1. Solder (using normal rosin core solder and a soldering iron).
2. Use simple hand tools like screwdrivers, wire cutters, and pliers.
3. Read and follow directions.
It helps if you:
1. know a bit about electronics, or
2. have a friend who knows a bit about electronics
3. can get to YouTube to watch a few helpful videos about the assembly process
(none are posted as of this version of the manual).
Tools you’ll need
You’ll need the following tools:
1. Phillips screwdriver (#1 and #2)
2. Pliers or nut drivers suitable for #4 and #6 hardware
3. needle nose pliers (helpful, but not strictly necessary)
4. pencil type soldering iron of 25 to 50 Watts (no huge honking soldering guns or
blowtorches)
5. wire cutters and strippers
6. multi-meter to measure power supply voltages and confirm resistor values
(strongly recommended)!
Helpful Tools
These tools aren’t strictly necessary, but make building the kit easier.
1. magnifying glass, if you’re over 42!
2. lead bending jig to form axial component leads to the correct span for insertion in
the PCB.
Project Overview
The project consists of the following steps:
1. Building these circuit boards:
a. Power Supply
b. Controller
c. Input Selector
d. Volume/Tone Control
2. Install and wire the circuit boards, switches, connectors, and power transformer
into the chassis.

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Important Safety Notes
By purchasing, using, or assembling this kit, you have agreed to hold Akitika LLC
harmless for any injuries you may receive in its assembly and/or use. To prevent injuries:
Wear safety glasses when soldering to prevent eye injuries.
Always unplug the power before working on the amplifier.
Large capacitors hold lots of energy for a long time. Before you put your hands
into the amplifier:
oPull the AC plug!
oWait 2 full minutes for the capacitors to discharge!
Remove jewelry and rings from your hands and wrists, or anything that might
dangle into the amplifier.
If working one the equipment with the power on, keep one hand in your pocket,
especially if you’re near the power supply or power supply wires. This can
prevent serious shocks.
Build with a buddy nearby. If you’ve ignored all the previous advice, they can
dial 911 or get you to the hospital.
About Components
We reserve the right to make design/or component changes at any time without prior
notification.
Recommended Solder
The kit must be assembled with 60/40 Rosin Core solder. The recommended diameter is
0.032 inches. Among many such sources of solder, I have used Radio Shack part number
64-009. It contains 8 oz. of solder, which is much more than you’ll need to assemble the
PR-101 kit.
Warranty
With the exception of fuses, Akitika will replace for free any parts of a correctly
assembled PR-101 that fail within one year of the date of purchase when the amplifier
has been used in home stereo applications. It is the responsibility of the kit builder to
install the replacement part(s). This warranty applies to the original purchaser only. It
does not apply to units that have been physically or electrically abused, modified without
prior factory authorization, or assembled with other than 60/40 Rosin Core solder.
Akitika LLC’s liability shall in no event exceed the cost paid to Akitika LLC for the kit.

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Section 2: About Building the Kit
Yes, I know you want to ignore this section, and jump right into building the kit.
However, please take a minute and read the advice of this section. I’ve condensed it into
bullets so that even you guys who are in a hurry can benefit.
There are 4 PCB’s to build:
oPower supply
oTone/Volume
oInput Selector
oController
Stop any time you’re feeling confused, tired, or anxious. Taking breaks at those
strategic times will keep the build enjoyable and greatly enhance your chances of
first-time success.
Finish one PCB before you build the next.
A soup bowl is your friend. Before you build a board, carefully empty the parts
for only that board into a broad, flat, light colored soup bowl. That makes it easy
to find the parts, and keeps them from getting lost.
A digital ohm-meter is an easy way to make sure that you’ve picked the right
resistor. It’s a great cross-check on the resistor color code. Measure twice and
solder once!
A lead-bending jig can make for quicker, neater assembly. It’s certainly not
necessary.
Is something in this manual confusing? Does something look wrong? Send your
questions by email to [email protected]om. You’ll help yourself and everyone who
builds the kit.

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Section 3: Building the Power Supply PCB
This section details the process of building the power supply circuit board. Begin by
carefully emptying the contents of the envelope marked “PR-101 PSU Module” into a
broad soup bowl, as shown below. In general, you’ll start with the components that lay
closest to the board, working your way towards the taller components.
Figure 1-Empty the power supply components into a soup bowl
Component Order
You’ll notice that the component designations in the directions don’t go exactly in order.
We have grouped them so that all components with the same value appear together. This
makes assembly easier. You’ll find in the parts kit that similar parts, e.g. 3 1K resistors,
are typically (though not always) taped together.
Install the Diodes
In general, you install axial leaded components (like the 1N4004 diodes) by placing the
body on silk screen side of the board, and the leads through the indicated holes. Bend the
leads over on the back of the board to keep the resistors from falling out until your solder
them in place. Try to bend the leads in a direction that won’t lead to solder bridges
between traces that should remain disconnected.
We recommend the following procedure:
1. Insert all components of the same value or type
2. Bend the leads as described above.
3. Solder the leads on the back of the board.
4. Clip the leads.
Track your progress by placing a check-mark in the done column as you install each
component. If you’re using a lead bending jig, use the 0.45” width for all the diodes.
Diodes – Polarity is important!
Make sure that the banded ended of the diode matches the banded end of the silk screen
Use 0.45” spacing for lead-bending jig (optional) for 1N4004 diodes
Designation Type Rating, Marking Done? ()
D3 1N4004 400 PIV 1 Amp, 4004
D4 1N4004 400 PIV 1 Amp, 4004
D5 1N4004 400 PIV 1 Amp, 4004

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D6 1N4004 400 PIV 1 Amp, 4004
D7 1N4004 400 PIV 1 Amp, 4004
D8 1N4004 400 PIV 1 Amp, 4004
D9 1N4004 400 PIV 1 Amp, 4004
D10 1N4004 400 PIV 1 Amp, 4004
D11 1N4004 400 PIV 1 Amp, 4004
Use 0.5” spacing for lead-bending jig (optional) for 2A04 diodes
D1 2A04 400 PIV 2 Amp, 2A04
D2 2A04 400 PIV 2 Amp, 2A04
D12 2A04 400 PIV 2 Amp, 2A04
D13 2A04 400 PIV 2 Amp, 2A04
Figure 2-Component side of power supply PCB before loading
Install the non-polarized Capacitors
The capacitors we install in this section can be installed in either orientation.
Non Polarized Capacitors
Designation Value Rating, Marking Done? ()
C1 0.1 µF
100 V Ceramic, 104 (stands for 10104=105pF =0.1
µF
C2 0.1 µF 100 V Ceramic, 104
C3 0.1 µF 100 V Ceramic, 104

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C4 0.1 µF 100 V Ceramic, 104
C7 0.1 µF 100 V Ceramic, 104
C8 0.1 µF 100 V Ceramic, 104
C5 0.01 µF 400 V Mylar, 10n (stands for 10 nano-Farads)
C6 0.01 µF 400 V Mylar, 10n (stands for 10 nano-Farads)
C18 0.033
µF 300 V AC, box shaped cap
Install the Not so Tall Polarized Capacitors
It’s important to install these caps with the proper polarity. The negative end of the cap is
marked with a minus sign. The silk screen on the board marks where the positive end of
the cap goes. Make sure that the negative end of the cap is away from the plus sign on the
circuit board. Polarized Capacitors – polarity matters!
Designation Value Rating Done? ()
C9 22 µF 35 V electrolytic
C10 22 µF 35 V electrolytic
C11 22 µF 35 V electrolytic
C12 22 µF 35 V electrolytic
C13 22 µF 35 V electrolytic
C14 22 µF 35 V electrolytic
Install the Fuse and Fuse Holder
Solder the body of the fuse holder to the PCB.
Figure 3-Fuse holder body solders into board, installing fuse into lid of fuse holder
Insert the 0.25 Amp (for 120-Volt operation) or the 0.125 Amp (for 240-Volt operation)
fuse into the fuse holder lid. Fit the lid into the body to complete fuse installation.
Install the Tall Polarized capacitors
Polarized Capacitors – polarity matters! Double check the rated voltage!
C15 4700 µF 35 V electrolytic
C16 4700 µF 35 V electrolytic
C17 4700 µF 16 V electrolytic

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Figure 4-Assembling Heatsink to a Regulator
Install the Regulators and Heat Sinks
For each of the three regulators (U1, U2, and U3), the installation process is the same,
with the result as shown in Figure 4. Note: U2 uses the tall heat sink!
Smear a thin film of thermal compound on back of the regulator.
Fasten the regulator to a heat-sink using a 4-40x5/16” Phillips pan-head screw and
a 4-40 keps nut (keps nuts have built-in lock-washers).
Tighten the hardware pretty well while keeping everything at right angles. A ¼”
nut driver is very handy tool for this step.
Follow the silk screen outlines and install each heatsink/regulator assembly into
its correct place on the board, as indicated in the table below.
The silver colored mounting rods on the bottom of the heat sink fit into pads on
the PCB.
Hold the heat sink flush against the PCB and solder the mounting rods to the
mounting tabs.
Solder the regulator leads into the PCB.
Regulators – orientation matters! Double check the part numbers. They are not
interchangeable!
Designation Value Rating Done? ()
U1 7912 12 V negative regulator (use a short heat sink)
U2 7805 5 V positive regulator (use the tall heat sink)
U3 7812 12 V positive regulator (use a short heat sink)

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Figure 5-Solder heat sink mounting rods to retain the heat sink
Install the voltage select jumpers
The PR-101 may be wired for either 120 Volt or 240 volt operation. This is done by
adding jumpers to the power supply board in the marked places.
Prepare three 22 AWG red wires as shown in Figure 6. Two will be used for voltage
select, the third is used in the following step.
Figure 6-Preparing voltage jumper wires
For operation on 120 Volts AC power, install and solder the jumpers as shown in Figure
7.
Figure 7-120 Volt Operation Jumper installation

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For operation on 240 Volts AC power, install and solder the jumpers as shown in Figure
8.
Figure 8-240 Volt Operation Jumper installation
Figure 9-Power Supply before transformer is installed, wired for 120 Volts
Install the AGND-BGND jumper
Use the third jumper prepared in the previous section to connect the AGND and BGND
eyelets of the power supply PCB. Insert the jumper from the component side and solder
on the solder side.

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Figure 10-Install AGND to BGND jumper
These Components Are Not Loaded
Three-pin headers TB1-TB6 and two-pin headers TB7-TB10 are not loaded in the
standard kit assembly. You will solder to some of these locations in later assembly steps,
but for now, the assembly of the power supply is complete.
Power Supply Inspection
Recheck your work to verify:
1. Correct diode polarity.
2. Correct polarity of polarized capacitors
3. Correct location of power supply voltage selection jumpers for the intended
power source (either 120V or 240 V)
4. Verify that all installed components have been soldered.

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Section 4: Assembling the Tone-Volume-Balance Board
This section details the process of building the Tone-Volume-Balance circuit board.
Carefully empty the contents of the envelope marked “PR-101 Tone Volume” into a
broad soup bowl.
Figure 11-Silkscreen side of the Tone Volume Board shows component locations
Install the Resistors
As we said before, you install the resistors by placing the body on the silk screen side of
the board, and the leads through the indicated holes. Bend the leads over on the back of
the board to keep the resistors snugly against the board until you solder them in place.
Try to bend the leads in a direction that won’t lead to solder bridges between traces that
should remain disconnected.
We recommend the following procedure:
1. Identify the group of (like valued) resistors that you plan to install. You’ll find
that resistors of the same value are often (but not always) collected together with
tape on both ends.
2. I recommend cutting the leads near the tape, then bending them in the lead
bending jig.
3. Insert the resistors into their correct places. If you’ve used a lead bending jig, you
may find that you need to do very little additional bending to retain the resistors in
their place.
4. Flip the board over onto a flat desk-top. If the stuffed PCB is flat, then all the
resistors will likely be close to the board, as they should be.
5. Solder the leads on the back of the board.
6. Clip the leads close to the solder bump, but don’t clip the solder bump.
7. Track your progress by placing a check mark in the done column as you install
each resistor.
You can identify the resistors by color code. I always like to cross-check the
identification by using a Digital Ohm Meter.
All of the resistors can be bent at 0.45” width for easy installation.

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Designation Value Color Code Done

R3 24R9 Red, yellow, white, gold, brown
R12 24R9 Red, yellow, white, gold, brown
R6 10K Brown, black, black, red, brown
R2 100K Brown, black, black, orange, brown
R7 100K Brown, black, black, orange, brown
R19 100K Brown, black, black, orange, brown
R38 100K Brown, black, black, orange, brown
R1 2K Red, black, black, brown, brown
R9 2K Red, black, black, brown, brown
R17 2K Red, black, black, brown, brown
R18 2K Red, black, black, brown, brown
R20 2K Red, black, black, brown, brown
R28 2K Red, black, black, brown, brown
R36 2K Red, black, black, brown, brown
R37 2K Red, black, black, brown, brown
R30 499 Yellow, white, white, black, brown
R11 499 Yellow, white, white, black, brown
R53 499 Yellow, white, white, black, brown
R56 499 Yellow, white, white, black, brown
R5 1K5 Brown, green, black, brown, brown
R8 1K5 Brown, green, black, brown, brown
R26 1K5 Brown, green, black, brown, brown
R27 1K5 Brown, green, black, brown, brown
R10 22K Red, red, black, red, brown
R25 22K Red, red, black, red, brown
R4 4K02 Yellow, black, red, brown, brown
R29 4K02 Yellow, black, red, brown, brown
R39 4K02 Yellow, black, red, brown, brown
Install the Diodes and Low Profile Capacitors
Bend leads to 0.45” spacing if you have a lead-bending jig.
Designation Value Description Done

D1 1N4004 1 Amp 400 PIV diode
D2 1N4004 1 Amp 400 PIV diode
D3 1N4004 1 Amp 400 PIV diode
D4 1N4004 1 Amp 400 PIV diode
D5 1N4004 1 Amp 400 PIV diode
D6 1N4004 1 Amp 400 PIV diode

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D7 1N4004 1 Amp 400 PIV diode
D8 1N4004 1 Amp 400 PIV diode
D9 1N4004 1 Amp 400 PIV diode
Now we’ll install the following small capacitors:
Bend leads to 0.4” spacing if you have a lead-bending jig
Designation Value Description Done

C3 100 pF COG, marking 101K
C5 100 pF COG
C6 100 pF COG
C9 100 pF COG
C29 100 pF COG
C30 100 pF COG
Install the bypass capacitors:
These leads are pre-formed, no bending is needed
Designation Value Description Done

C11 0.1 µF Bypass cap, 100 V, marked 104
C12 0.1 µF Bypass cap, 100 V, marked 104
C13 0.1 µF Bypass cap, 100 V, marked 104
C14 0.1 µF Bypass cap, 100 V, marked 104
C15 0.1 µF Bypass cap, 100 V, marked 104
C16 0.1 µF Bypass cap, 100 V, marked 104
C17 0.1 µF Bypass cap, 100 V, marked 104
C18 0.1 µF Bypass cap, 100 V, marked 104
C19 0.1 µF Bypass cap, 100 V, marked 104
C20 0.1 µF Bypass cap, 100 V, marked 104
C24 0.1 µF Bypass cap, 100 V, marked 104
C25 0.1 µF Bypass cap, 100 V, marked 104
C26 0.1 µF Bypass cap, 100 V, marked 104
C27 0.1 µF Bypass cap, 100 V, marked 104
C28 0.1 µF Bypass cap, 100 V, marked 104
Install the Relay and the Manual Pots
Designation Value Description Done

K1 Relay DPDT, 5 volt coil
POT3 10K Pot Linear taper, treble control
POT4 10K Pot Linear taper, bass control

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Install the Tall Capacitors
Designation Value Description Done

C2 2.2 nF Film cap, 63 volt, marked 2n2K63
C8 2.2 nF Film cap, 63 volt, marked 2n2K63
C1 0.1 µF Film cap, 100 volt, marked 1J100
C7 0.1 µF Film cap, 100 volt, marked 1J100
C4 1 µF Film cap, 63 volt, marked 1J63
C10 1 µF Film cap, 63 volt, marked 1J63
Install the Electrolytic Capacitors
Note: C21, C22, and C23 are polarized electrolytic caps. Verify proper polarity before
you solder.
Designation Value Description Done

C21 220 µF Electrolytic, 35 Volt, watch polarity
C22 220 µF Electrolytic, 35 Volt, watch polarity
C23 220 µF Electrolytic, 35 Volt, watch polarity
Install the Integrated Circuits and Transistor
Figure 12-Remember to match silk screen and IC orientation mark
As in previous IC installation steps:
Get the IC in the right way by matching silk screen and IC orientation marks
Bend two corner pins to retain the IC until you solder it in place. Choose places to
bend the pins that avoid shorting traces together.
Designation Value Description Done

U2 LME49720 Dual Opamp
U3 LME49720 Dual Opamp
U4 LME49720 Dual Opamp
U5 LME49720 Dual Opamp
U6 LME49720 Dual Opamp
U7 SN754410 Dual H-Driver
Q1 MPSA06 NPN transistor, TO-92 case

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Install the Control Cable Connector
Looks at this drawing CAREFULLY to be sure that you’re putting P5 in correctly! These
three things show the odd-numbered side of the connector:
1. Centrally located notch in the long side
2. notches in the short sides are closer to the odd-numbered side of the connector
3. AMP is visible at the bottom of the centrally located notch
Study this drawing and the connector until it’s clear which side is the odd pin side of the
connector, then match it to the odd pin silk screen on the PCB. Solder two corner pins,
and make sure that you’ve got it right one more time before you solder the remainder of
the pins.
Figure 13-Identify pin 1 for proper connector installation
Designation Value Description Done

P5 10 pin 5 x 2
Install the Motor Pots
Prepare a long and a short piece of 24 AWG solid wire according to Figure 14.
Figure 14-Motor POT wire preparation
Designation Length D Done 
POT1 Long
Wire 5/8” Solder one end in the upper motor terminal.
POT1 Short
Wire ½” Solder one end in the lower motor terminal.

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Figure 15-Motor POT wiring detail
Repeat the process for POT2.
Designation Length D Color Code Done 
POT2 Long
Wire 5/8” Solder one end in the upper motor terminal.
POT2 Short
Wire ½” Solder one end in the lower motor terminal.
Install and solder both motor POTS on the board. Guide the motor pot wires into the
labeled holes:
Long wire into MOTOR-
Short wire into MOTOR+
You’ll solder in 10 places for each motor POT:
3 terminals for the right channel
3 terminals for the left channel
Motor+ wire
Motor- wire
2 mounting terminals near the center of the motor POT footprint.
Figure 16-Completed Tone/Volume Board