OLA5 Assembly Guide
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You'll need the tools below to complete this build.
We recommend an adjustable-temperature station, such as the $40 Weller WLC100.
You can use 60/40 "leaded" solder or lead-free. We recommend 60/40 because it flows better and is easier for beginners to use.
Phillips Head Screwdriver
A #1 Phillips head screwdriver.
You'll need a pair of good "snips" for cutting of the excess leads after soldering.
These tools aren't strictly necessary but can make your build a bit easier.
A bit of clear tape will help hold some tricky components in place for soldering.
Standard, needle-nose pliers.
If you find the color bands on resistors a bit hard to read, you can use a meter to sort them with absolute confidence.
If you accidentally solder something in the wrong place, a desoldering pump can save the day.
The resistors are sorted into three sub bags in order of their part numbers on the circuit board. We recommend sorting, placing, and soldering one bag at a time to reduce mistakes. Note that R2 is a jumper and will be populatd in the next step.
Place Jumper for R2
Use one of the excess resistor leads to create a "0 Ohm" resistor for R2. Bend the lead and solder it to the PCB just like a component.
Place Sockets and Headers
Place IC Sockets and Headers
Place the sockets and headers on the motherboard. Use some tape to hold them in place as you solder the first joint. If the part is not mounted correctly after the first joint, heat the joint while pushing the part in from the other side of the PCB. Keep holding onto the part until the joint has cooled, then solder the rest of the pins.
Orient CON2 so that the side with a notch out of the plastic is facing away from the card edge.
Place two of the three jumpers on CON1 in the "MOD" positions for the modern output.
Place the third jumper on CON3 to set the LIMIT ratio. You can always change this and the output setting later.
Place Small Caps, LEDs, and Fuses
Place Sub Bag 1
Caps CB1-CB8 and fuses F1 and F2 are not polarized.
Pin 1 on the RA1 resistor array is marked by a dot. Align this dot with the dot on the PCB.
The positive lead of the LEDs 1 and 2 is indicated by a longer lead. Place this lead in the hole marked "+".
Place Sub Bag 2
The 100pF caps C3, C7, and C11 are not polarized.
The 22uF caps C8 and C10 are polarized. The positive lead is longer and is marked with a "+".
Place D1-D3 so that the black stripe on the body matches the white line on the PCB.
Place Sub Bag 3
None of the caps in this bag are polarized.
Place Q1 so that the side with the writing faces the bottom of the PCB.
The positive lead of LED5 is longer. Flip the board over and place the LED from the bottom of the board. Insert it until the flat part of the leads and then bend it toward where the front panel will be.
Place Large Caps
C4, C6, C19, and C20 are not polarized.
The remaining caps have a band on the side of the body to indicate the negative lead.
Place Potentiometers and Switches
Place the caps on the switches first. Then place and solder them.
Place Standoffs and Socket
Assemble Daughter Board
Place Sub Bag 1
Place Switches and Bracket
Solder LED Board to Daughterboard
First place the straight end of the right-angle header, solder, and trim. Then place the bent end in the daughterboard and solder.
Place LEDs in PCB
The flattened side of the LED on the PCB silkscreen indicates the negative terminal, which corresponds to the shorter leg on the LED.
Place LEDs in Front Panel
Place a piece of low tack tape over the LED holes in the front panel. Then place the daughterboard in the front panel and fasten it with a screw from bag #9. Press down on the tape to make sure that all of the LEDs sit flat and flush with the front panel.
Solder the LEDs and trim the leads, then remove the front panel from the daughterboard.
Attach DB to MB
Place the 12-pin header in the CON5A socket with the longer ends going into the socket. Now place the DB over them so the shorter leads go through CON5B from below. Screw the DB to the standoffs and solder CON5B.
Solder LEDs and LED Boards
Place Standoffs and Tubes
Screw in the four standoffs for each opto from below the motherboard. Then place the black tubes over the LED pcbs.
Place LDRs and Headers
Solder LDR and Headers
Place Integrated Circuits
Place ICs in Sockets
Attach Ribbon Cable
Attach Front Panel
Attach Front Panel and Knobs
Before you wrap up, check the following things:
All good? Congrats on finishing your build! Have a question or problem? Drop us a line.
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