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BYOC Optical Compressor Kit Instructions Manual

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BYOC Optical Compressor Kit Instructions
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Mounting the PCB.................................................page 8 - 10
Copyright 2008 Build Your Own Clone

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Summary of Contents for BYOC Optical Compressor Kit

  • Page 1: Table Of Contents

    BYOC Optical Compressor Kit Instructions Parts Checklist ....page 2 Populating the Circuit Board ....page 3 - 6 Assembly ....page 7 Mounting the PCB..........page 8 - 10 Wiring .....page 11 Finish up ....page 12 Schematic, Understanding the circuit and Troubleshooting.............page 12 - 23...

  • Page 2: Parts Checklist

    Parts Checklist for BYOC Optical Compressor Kit Resistors: 1 - 47ohm (yellow/purple/black/gold/brown) 2 - 4.7k (yellow/purple/black/brown/brown) 2 - 10k (brown/black/black/red/brown) 4 - 100k (brown/black/black/orange/brown) 2 - 220k (red/red/black/orange/brown) 1 - 470k (yellow/purple/black/orange/brown) 1 - 1M (brown/black/black/yellow/brown) 1 - 2.2M (red/red/black/yellow/brown) Capacitors: 1 - .01uf film (103 or 10nJ)

  • Page 3: Populating The Circuit Board

    Populating the Circuit Board Step1: Add the resistors. Resistors are not polarized so they can go in the PCB in either direction. THE 47ohm RESISTOR WILL BE OMITTED ON NEWER PCBs. Step 2: Add the larger black plastic diode with silver stripe(1N4001). Make sure the stripe matches up with the layout on the PCB.
  • Page 4 Step3: Add the Op Amp. Pin 1 of the op amp will go in the square solder pad. Pin 1 is sometimes denoted by a small dot in one corner on the top of the chip. This dot should be in the same corner as the square solder pad on the PCB.
  • Page 5 Step 5: Add the metal film capacitors. These are not polarized and can go in the PCB in either direction. Step6: Add the Opto-Coupler. It should be fairly obvious that the side with 3 leads goes in the side that has 3 solder pads and the side that has 2 leads goes in the side that has 2 solder pads.
  • Page 6 Step 7: Add the aluminum electrolytic capacitors. These will be the can shaped caps. They are polarized so make sure to orient them correctly. The longer lead is the positive lead and goes in the square solder pad. The shorter lead is the negative lead and goes in the round solder pad.

  • Page 7: Assembly

    Assembly 1. Install the jacks first. If you are looking down inside the enclosure, the mono jack goes on the right side and the stereo jack goes on the left. Place the washer on the outside of the enclosure. Use a 1/2" wrench to tighten 2.
  • Page 8 Mounting the Circuit Board PC Mounted Potentiometers: Some kits will come with PC mounted pots depending upon availability. If your kit has PC mounted pots follow these steps for mounting the circuit board. Step1: Understand that the LED, and both potentiometers will be mounted and soldered directly to the underside of the PCB.
  • Page 9 Step 3: Now mount the PCB with LED onto the leads of the potentiometers. This move may take a little finess. It's best to leave your pots somewhat losely mounted to the enclosure so that you can easily move them to line up with the eyelets on the PCB. You may need to bend the leads of the pots into place if they were bent in shipping.

  • Page 10: Mounting The Pcb

    Solder Lugged Pots: Some kits may come with panel mounted pots with solder lug termination. If you kit has these style pots, follow these steps for mounting the PCB. Step 1: Connect the pots to their eyelets on the PCB with hook up wire. Insert the wires from the underside of the PCB and solder on the topside.

  • Page 12: Finish Up

    Finishing Touches Install the base of the enclosure with the 4 screws that came with your kit. Add the rubber bumper feet...unless you're a velcro person. Add the 2 knobs. Be sure not to tighten the set screw inside the knobs too tight or you may strip them. If you've got any problems that you can't figure out yourself, visit board.buildyourownclone.com for technical...
  • Page 15 Checking your wiring 1. NO POWER: If you have a completely dead pedal and your LED will not light up, this is usually a good sign that you are not getting power to the circuit. First you need to make sure that you are using a fresh battery or good power supply. Even though this pedal can run on 12v - 18v, let's use 9v for trouble shooting purposes to keep things simple.
  • Page 16 locations, then you likely have a bad solder joint somewhere along the orange wiring. This also includes the jumper connection between lugs 4 and 9. *If you do not get continuity between lugs 8 and 9 and you are certain that the footswitch is in the bypass state, then you likely have a faulty footswitch.
  • Page 17 Checking your PCB Ok..So Now you know bypass is working, signal is getting to and from the PCB, and that the PCB also has a connection to +9V and ground. If you're still haveing trouble, it's time to check your work on the PCB. Keep in mind that the PCB is simply a means of connecting one component or wire to another component or wire.
  • Page 18 2. Check all Full Positive Voltage connections. The term Full Positive Voltage is used, because after D1 and R12, the voltage will be slightly diminished. Your positive voltage may be 9V at RED location 1, but drop to 8.5V at locations 2 and 3, and then drop again to 8.2V at location 4.
  • Page 19 3. Test all Half Positive Voltage ORANGE locations. This reading should be approx. half of what your Full Positive Voltage is. 4.5V to 4V is to be expected. Set your DMM to read 5VDC. Touch the black probe to the sleeve of either jack. Touch the red probe to the various ORANGE test locations on the PCB.
  • Page 20 4. Test the audio signal path. Do this using a Signal Test Probe. If you look at the schematic, you'll see that BLUE locations 1 - 14 make up your direct signal path in order between the INPUT of the circuit and the OUTPUT of the circuit. A bad solder joint anywhere along here or installing your op amp incorrectly will obviously mean no sound.
  • Page 21 5. The Trigger Voltage Path. This is really where all the action of this pedal is happening. Before getting into how to test this part of the circuit, let's understand what it is doing. It's really quite simple...assuming you actually understand what a compressor is supposed to do.
  • Page 22 between pins 6 and 7 of IC1A. The most important thing to understand here is that, the more resistance between pins 6 and 7, the more output IC1A will produce. The less resistance between pins 6 and 7, the less output IC1A will produce. Now let's bring the functions of the LDR and the op amp together.
  • Page 23 Unfortunately because both transistors are in parallel, there is no way to determine which is suspect, so take a guess. Maybe you'll get it on the first try. ©2008 byoc, LLC...