AkitikA PR-101 Assembly Manual
Stereo preamplifier
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Summary of Contents for AkitikA PR-101
- Page 1 PR-101 STEREO PREAMPLIFIER ASSEMBLY MANUAL © 2014 AkitikA LLC All rights reserved Revision 4p16 November 29, 2014 Page 1 of 53...
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Page 2: Table Of Contents
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 ...................... - Page 3 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 ........................
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Page 4: Table Of Figures
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 .. -
Page 5: Section 1: About This Manual
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). -
Page 6: Important Safety Notes
60/40 Rosin Core solder. Akitika LLC’s liability shall in no event exceed the cost paid to Akitika LLC for the kit. Page 6 of 53... -
Page 7: Section 2: About Building The Kit
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 dan@akitika.com. You’ll help yourself and everyone who builds the kit. Page 7 of 53... -
Page 8: 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. -
Page 9: Install The Non-Polarized Capacitors
1N4004 400 PIV 1 Amp, 4004 1N4004 400 PIV 1 Amp, 4004 1N4004 400 PIV 1 Amp, 4004 1N4004 400 PIV 1 Amp, 4004 1N4004 400 PIV 1 Amp, 4004 1N4004 400 PIV 1 Amp, 4004 Use 0.5” spacing for lead-bending jig (optional) for 2A04 diodes 2A04 400 PIV 2 Amp, 2A04 2A04... -
Page 10: Install The Not So Tall Polarized Capacitors
0.1 µF 100 V Ceramic, 104 0.1 µF 100 V Ceramic, 104 0.1 µF 100 V Ceramic, 104 0.01 µF 400 V Mylar, 10n (stands for 10 nano-Farads) 0.01 µF 400 V Mylar, 10n (stands for 10 nano-Farads) 0.033 300 V AC, box shaped cap µF Install the Not so Tall Polarized Capacitors It’s important to install these caps with the proper polarity. -
Page 11: Install The Regulators And Heat Sinks
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! ... -
Page 12: Install The Voltage Select Jumpers
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. -
Page 13: Install The Agnd-Bgnd Jumper
For operation on 240 Volts AC power, install and solder the jumpers as shown in Figure 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. -
Page 14: These Components Are Not Loaded
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. -
Page 15: Section 4: Assembling The Tone-Volume-Balance Board
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... -
Page 16: Install The Diodes And Low Profile Capacitors
Designation Value Color Code Done 24R9 Red, yellow, white, gold, brown 24R9 Red, yellow, white, gold, brown Brown, black, black, red, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown Red, black, black, brown, brown... -
Page 17: Install The Relay And The Manual Pots
1N4004 1 Amp 400 PIV diode 1N4004 1 Amp 400 PIV diode 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 ... -
Page 18: Install The Tall Capacitors
Install the Tall Capacitors Designation Value Description Done 2.2 nF Film cap, 63 volt, marked 2n2K63 2.2 nF Film cap, 63 volt, marked 2n2K63 Film cap, 100 volt, marked 1J100 0.1 µF Film cap, 100 volt, marked 1J100 0.1 µF 1 µF Film cap, 63 volt, marked 1J63 1 µF... -
Page 19: Install The Control Cable Connector
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. -
Page 20: Figure 15-Motor Pot Wiring Detail
Figure 15-Motor POT wiring detail Repeat the process for POT2. Done Designation Length D Color Code POT2 Long 5/8” Solder one end in the upper motor Wire terminal. POT2 Short ½” Solder one end in the lower motor Wire terminal. -
Page 21: Install Tone/Volume Power Wiring
Install Tone/Volume Power Wiring Cut a 10” length of the 18 AWG 2 conductor cable. It’s the heavier of the two gray jacketed cables in the kit. 1. Remove 1” of gray jacketing from both ends. 2. For each of the four ends (2 ends of the red wire, 2 ends of the black wire): a. - Page 22 10. Cut the gray jacket reserved in step 1 above to ½” lengths, and slip these over the drain wire (you’ll probably have some spare gray insulation). Insert each of these wires from the solder side of the board, and solder them on the component side.
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Page 23: Section 5: Assembling The Input Selector Board
Section 5: Assembling the Input Selector Board Carefully empty the contents of the envelope marked “PR-101 Input Selector” into a broad soup bowl. Figure 17-Silkscreen side of the Input Selector Board shows component locations Install the Resistors Install the resistors using the same procedures outlined in the previous section. If you’re using a lead bending jig, all the resistors should be bent at a width of 0.45”. - Page 24 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K Brown, black, black, orange, brown 100K...
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Page 25: Install The Small Capacitors
49R9 Yellow, white, white, gold, brown 4K02 Yellow, black, red, brown, brown 4K02 Yellow, black, red, brown, brown 4K02 Yellow, black, red, brown, brown 4K02 Yellow, black, red, brown, brown NL means not loaded NL means not loaded Install the Small Capacitors Now we’ll install the following small capacitors. -
Page 26: Install The Bypass Capacitors
1N4004 1 Amp 400 PIV diode 1N4148 75 V switching diode 1N4148 75 V switching diode Install the Bypass Capacitors The bypass capacitors are pre-formed to the correct span. Drop each one in, and bend the leads to around a 45 degree angle to hold the capacitors. Solder, then clip the leads in the normal fashion. -
Page 27: Install The Relays
Designation Value Description Done 16 pin 8 x 2 Install the Relays There are 16 identical relays, numbered K1-K16. Install them all. Here’s an installation hint. As you put each relay in, bend down two diagonal corner pins to hold the relay in place. -
Page 28: Install The Transistors
Install the Transistors Insert each transistor into the board, making sure that the shape of the transistor follows the silk-screen outline on the PCB. Here’s an easy way to do it. 1. Cut the transistors leads close to the tape. This leaves them as long as possible without having to deal with the adhesive from the tape. -
Page 29: These Connectors Are Not Populated
the pins pop through the board. It will take a little squeezing and wiggling, but it fits very nicely and securely. It will make a popping sound as it pushes into the board. Make sure the connectors are seated flat on the board before you solder them in place. The ground leads will take a generous amount of heat to solder well. -
Page 30: Take A Break
c. Tin each end 8. Insert the red wire from the solder side of the PCB into the hole in TB13 labeled POS12. Solder it on the component side. 9. Insert the black wire from the solder side of the PCB into the hole in TB13 labeled NEG12. -
Page 31: Section 6: Assembling The Controller
Section 6: Assembling the Controller Carefully empty the contents of the envelope marked “PR-101 Controller” into a broad soup bowl. Locate the controller PCB, and read the next box very carefully! The controller board is a bit unusual in that components will be installed on both sides of the PCB. -
Page 32: Install The Non-Polarized Capacitors
Designation Value Color Code Done Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown Yellow, white, white, black, brown... -
Page 33: Install The Ic's And Transistor
Install the IC’s and Transistor Make sure to orient the IC’s correctly when you install them. After you install each IC, bend over two diagonally opposed leads to retain the IC. Then double check to make sure that: You have the correct IC in the correct location. ... -
Page 34: Install The Ferrite Beads
Install RN2 in the indicated place. Make sure that pin 1 of RN2, marked by the dot, goes into the square pad in the RN2 hole pattern on the PCB. Solder the two end pins first to make sure that RN2 is sitting level on the board. Once RN2 is level, solder the balance of the pins. -
Page 35: Install The Control Cable Connectors And Controller Socket
Install the Control Cable Connectors and Controller Socket Insert the 10 pin cable connector, P6. Make sure to match up the pin numbers on the silk screen with the pins on the connector as shown in Figure 21. Figure 21-10 pin cable conector pinout ... -
Page 36: Install The Polarized Capacitors
Next, install and solder the 20 pin socket into the silkscreen into U4. Make sure that the indented feature in the socket matches the indentation in the silk screen. (In Figure 23 we’ve added a gray line to the socket to emphasize the indentation). Figure 23-showing socket orientation It’s best to hold the socket in place by bending over two corner pins in a direction that won’t encourage shorts to adjacent traces. -
Page 37: You've Finished This Side Of The Controller Pcb For Now
You’ve Finished this Side of the Controller PCB for Now Most of the remainder of the components will be installed on what has until now been the solder side of the board. We will return to this side of the board later to install the last few components. -
Page 38: Install The Infrared Detector
Designation Description Done Normally open push button switch SW11 Normally open push button switch Normally open push button switch Normally open push button switch Use the same method to insert and solder in the rest of the switches. Designation Description Done ... -
Page 39: Install The Leds
Install the LEDs Figure 26-LED with white spacer added This section is a little tricky, so please follow the instructions carefully for best results. 1. Mate each LED with a plastic spacer as shown in Figure 26. These spacers make it easy to assure uniform height above the PCB. -
Page 40: Install The Last Two Capacitors
b. Make sure the bottom of each LED touches the white spacer evenly. c. Make sure that the other side of the white spacer sits on the PCB. If it isn’t, then it’s easy to heat the one solder joint, while pushing the LED assembly against the PCB. -
Page 41: Install The Microcontroller
Figure 28-Completed controller, push-button and LED side XXXX-must change picture at top of page Install the Microcontroller Install the microcontroller into the socket U4. It’s a 20 pin 0.3” wide DIP, marked MSP430G2132IN20. Be careful to get pin 1 at the correct end of the socket by matching the indents in the part, silk screen, and socket (see Figure 23). - Page 42 2. twist the strands together 3. tin the strands Select one end of the wire red black zip cord. 1. Insert the red wire into the VCC pin of TB1 from the component side. 2. Solder the red wire on the on the switch and LED side of the controller board. 3.
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Page 43: Section 7: Chassis Assembly And Power Wiring
Section 7: Chassis Assembly and Power Wiring Protect your PR-101 Spread a towel over your work surface before you begin the steps outlined in this section. That towel will prevent you from scratching the finish of your PR-101 during these assembly steps. Install the feet Install the four feet into the corners of the bottom of the chassis using 6-32x ½”... -
Page 44: Install Back Panel Power Connectors And Front Panel Power Switch
5. Inspect the IR window location, making sure that it doesn’t block any of the adjacent switch or LED holes. If necessary, this is your chance to move the window. 6. If you’re satisfied with the window position, press it firmly against the chassis to seat it well in place. -
Page 45: Section 8: Preliminary Final Assembly
4. Connect the red 0.25” wide FASTON at the end of the long wire to the remaining bottom row switch contact. 5. Connect the blue 0.25” wide FASTON to the IEC power contact farthest from the chassis wall. 6. Connect the red 0.187” wide FASTON to the unswitched outlet contact farthest from the chassis wall. -
Page 46: Figure 31-Fasten The Transformer To The Preamp Right Side Wall
Fasten the transformer to the right side wall of the preamp in the manner shown in Figure Figure 31-Fasten the transformer to the preamp right side wall Prepare the transformer wires for connection to the power supply PCB as follows, twisting the wires approximately every inch: 1. -
Page 47: Prepare To Test The Power Supply
d. Insert the orange wire into the power supply PCB hole labeled orange, and solder the wire on the solder side. Clip the extra on the solder side. e. Insert the green wire into the power supply PCB hole labeled green, and solder the wire on the solder side. -
Page 48: Install The Controller Pcb
Install the Controller PCB Make sure that you’re calm and well rested before starting this portion of the assembly. If so, gather the following items: 1. Controller PCB with attached red/black power wire 2. -
Page 49: Test The Remote Control
IR window. Press the input selector keys. The front panel LED’s corresponding to the input selector keys should illuminate. Remove the IEC power cable from the AC mains and the IEC connector of the PR-101 Connect Power to the Input Selector PCB Temporarily install the input selector PCB: 1. -
Page 50: Connect Power To The Tone Volume Pcb
6. Push the Tape 1 Mon and Tape 2 Mon buttons. A somewhat softer audible mechanical thump should result from the operation of the associated relay. Remove the IEC power cable from the AC mains and the IEC connector of the PR-101 Connect Power to the Tone Volume PCB Temporarily install the Tone Volume PCB: 1. -
Page 51: Section 9: Final Final Assembly
6. Point the remote control at the PR101. Press the balance left and right buttons. You should see the balance control move. Remove the IEC power cable from the AC mains and the IEC connector of the PR-101 Section 9: Final Final Assembly In this section you’ll complete final assembly of the PR-101. -
Page 52: Final Mechanical Assembly
Your PR-101 preamp is ready for use. Section 10: About the Preamp Architecture Features The PR-101 preamp has a very flexible design. It features: Selection amongst six inputs Support for two tape decks Buffers for the “to tape” outputs minimizes loading and distortion from connections to non-powered tape decks ... -
Page 53: Block Diagram
Block Diagram The input selector selects amongst six inputs. The signal selected on the input selector is buffered and output to tape1 and tape2 for recording. The signal delivered to the balance control input can be either the one specified on the input selector, or the output from tape1 or from tape 2.
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