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BYOC Optical Compressor, Instructions Manual, Page: 1 / 23

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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

Copyright 2008 Build Your Own Clone

Summary of Contents for Optical Compressor

Page 1: ...s 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 Copyright 2008 Build Your Own Clone ...

Page 2: ...red black yellow brown Capacitors 1 01uf film 103 or 10nJ 4 047uf film 473 or 47nJ 2 33uf aluminum electrolytic 1 220uf aluminum electrolytic Diodes 1 1N4001 IC s and Transistors 1 TL082 TL072 4558 or other dual op amp 2 2N5088 Opto Coupler VTL5C4 2 Potentiometers Be sure to snap off the small tab on the side of each pot 1 A100k log 1 B500k linear Hardware 1 drilled enclosure w 4 screws 1 byoc opt...

Page 3: ...n 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 The cathode striped end goes in the square solder pad The anode goes in the round solder pad ...

Page 4: ...rner as the square solder pad on the PCB Sometimes there will also be a U shaped notch in one end Match this notch up with the notch in the layout Usually there is only one type of marker or the other for orienting the OpAmp but if there are both markers always defer to the U shaped notch first Step 4 Add the transistors Make sure to match the rounded back of the transistor with layout ...

Page 5: ...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 The writing on the opto coupler should be facing up The positive end will be marked with a and should match up with the on the layout ...

Page 6: ...older pad The shorter lead is the negative lead and goes in the round solder pad The negative lead will be denoted by a stripe or some sort of marker running down the side of the capacitor SOME PCBs WILL CALL FOR 100uf IN PLACE OF THE 220uf AND 47uf IN PLACE OF THE 33uf CAPACITORS YOU SHOULD IGNORE THIS AND USE THE 220uf IN THE SPACE MARKED FOR 100uf AND USE THE 33uf s IN THE SPACES MARKED FOR 47u...

Page 7: ...solder lugs are pointing down The washers go on the outside Use a 10mm wrench to tighten but only snug Do not over tighten the pots You should leave the pots somewhat loose until they are soldered to the PCB so that it will be easier to mount them 4 Install the footswitch The first bolt and metal washer go inside The plastic washer and second bolt go on the outside It does not matter which side yo...

Page 8: ...uld do the actual soldering on the topsid of the PCB Read through all the steps in this portion before doing anything so that you can get the big picture Step 2 Install the LED but do not solder it or clip the leads You will insert the LED into its eyelets Make sure the longer lead goes in the round eyelet and the shorter lead goes in the square eyelet Yes this is correct Longer lead in the round ...

Page 9: ... eyelets on the PCB You may need to bend the leads of the pots into place if they were bent in shipping Step 4 once you have the PCB in place snug the nuts of the pots and toggle switch with your fingers Step 5 Move the LED into place by guiding it with the leads that are sticking out of the top side of the PCB Step 6 Solder the LED and pots on the top side of the PCB Clip the excess LED leads Do ...

Page 10: ...esive nylon standoffs from the underside of the PCB into the large mounting eyelets but do not remove the paper backings yet Step 3 Install the LED into the underside of the PCB but DO NOT SOLDER IT YET The longer lead goes in the round pad and the shorter lead goes in the square pad Not that s not a typo Yes that is correct Longer lead in the round pad Shorter lead in the square pad Bend the lead...

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Page 12: ...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 support Please read the trouble shooting guide first Schematic Understanding the Circuit and Trouble shooting ...

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Page 15: ...o the POS eyelet and the black probe to the LED eyelet You will probably get a little more than 9V with an adaptor and a little less than 9V with a battery If you are not getting a reading here keep the red probe on the POS eyelet and move the black probe to one of the locations If you do not get a reading now you likely have a bad connection somewhere along the red wire If you don t get a 9V read...

Page 16: ...re your footswitch is in the ENGAGED state You should get continuity between the two locations and between the two locations If you do not get continuity between the locations check for continuity between lugs 4 and 5 If you do not get continuity between the locations check for continuity between lugs 7 and 8 If you get continuity between lugs 4 and 5 but no continuity between the locations then y...

Page 17: ... the PCB is simply a means of connecting one component or wire to another component or wire So when you touch your probe to the test location you want to touch the probe to the exposed component or wire lead at that location and not to the PCB solder pad 1 Check all ground connections Set your DMM to test for continuity Touch one probe to the sleeve of either jack and touch the other probe to the ...

Page 18: ...ge 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 This is to be expected But RED locations 4 8 should all remain constant and should be somewhere between 9V and 8V Set your DMM to test for 9VDC Touch the black probe to the sleeve of either jack Touch the red probe to the various RED test locations on the PCB ...

Page 19: ...ns 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: ...C1A Pin 7 BLUE 8 One branch goes to BLUE 11 which would begin the signal output path The other two splits branch off to make up the envelope triggers the first branch being BLUE 15 through 18 and the second branch being BLUE 19 through 28 A bad solder joint along either of these two braches of the signal path would still permit the pedal to pass sound but the actual compression would not work corr...

Page 21: ...ange the resistance of the LDR And the amount of voltage that we apply to the LED portion of the opto coupler will have an affect on how much the resistance of the LDR portion changes The next thing we need to understand is the op amp operational amplifier and how it is used in this particular circuit An op amp can have many many different functions but in this circuit the op amp is serving to amp...

Page 22: ...rs in parallel helps to smooth out the compression and having two triggers with uneven input signals adjusts the taper of the transistion None the less the two transistor based envelope triggers are identical and the way they work is very simple You can better understand the relationship between the envelope triggers and the LED portion of the opto coupler better by looking at the LED status light...

Page 23: ...ied and the voltage drop as the guitar signal strength decays Unfortunately we cannot see the LED because it is encapsulated in the opto coupler It would be easy to tell if we had problem with the opto coupler itself if we could see the LED You can install a regular LED into the LED end of the opto coupler to see it work If you are getting a trigger voltage to the anode of the opto coupler LED and...

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