This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, June 7, 2017

Diamond Compressor

Gotten several requests for this one and for good reason. It's probably the best optical compressor design out there. This one's not for the feint of heart, and will take up most of a 1590BB enclosure. 3 jumpers, but the pots are board mounted. The on/off indicator LED in the original is a bi-color LED that pulsates with the signal. The switches in the original are internal, but can be mounted externally for more control. Be sure to jump lugs 3 and 5 on the EQ switch. Here's the schematic for reference.


45 comments:

  1. OMFG

    It won't take me long *rushes for a pack of napkins*

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  2. How can I make the image bigger and clearer? When i save it and blow it up to read the values, it gets blurry. Am I missing something? How do you guys do it?

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    1. Just click on the image and it should open at a higher resolution

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    2. what i do is, click on the image, then right click and select view image, expand the image to maximize and then save in to the disk, hope this help :)

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    3. Hi, if you have photoshop its very easy to control the dark of pcb …
      I make my own PCB and when pcb's finished with photoshop, i print it with my hpdeskjet with clear shit of plastic projector ! The quality is very nice !!!

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  3. Hope someone verify this, i ordered some VTL5 but should be here in at least 2 months.

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  4. Thanks guys. Works fine on tablet or phone but not on laptop. Weird......

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  5. HOooo Yes thanks very much man !!!! i love this comp going to make it next week

    The vlt5c3 can be find at banzai internet electronic store ! they have to the VLT5c10 for demeter compulateur
    and lf356 for compulator fomenter can be find at Taïda internet store !

    For the diamond comp is there any version or modification for bass guitare ?
    Thanks for all man !

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    1. I don't know of any bass mods. I'd just build it as is first and see how it sounds with bass, then adjust caps as necessary (if necessary).

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    2. OK thanks going to try it with my bassist friend !

      Thanks very much, your job is so nice !!!!!

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  6. Hi !
    just see it now… it's not a true bypass ?
    If i'm right FSW1/2/3 mean foot switch ? but kind of foot FS ?
    Usualy i use 3PDT switch … could you clear me please about it ?

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    1. It is true bypass and uses a 3PDT. The pads for the footswitch are for the LED wiring (it uses a bi-color LED that pulses with the signal).

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  7. Hi ! Juste à question :
    Dont have spst swich for hi cut swich ! Could i put à spdt on / on on lug 1&2 ? The same no ? Or à spdt on of on ?

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  8. Some information on the probable differences between the regular diamond comp and the diamond bass comp:

    http://vulcanofx.blogspot.com/2013/07/diamond-bass-compressor.html

    Seems like it can be implemented with the above layout + off-board stuff but i haven't dug too deep into the information.

    an optocompressor is sort of on my list but i am not in a hurry as i feel like my pearl co-04 is pretty ok.

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  9. Verified on the compressor part! I did not plug the led compression by laziness on my part! The hi cut reacted very little! Otherwise the compressor works very well! Very good sound !
    Thanks for this layout !

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    1. Hi, can you post your voltages?

      I can't make my clone work for some reason.

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    2. do you need the voltage agin ?
      sorry just see your post !

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    3. Nah, Franck, thanks, I've already figured it out myself.

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    4. Hey wondering, what was the problem with your circuit that you resolved? Just build this thing and it's not working, haven't been able to track down the issue yet.

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  10. Hi
    Thanks for the great site !
    what is the pcb dimension ?

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    Replies
    1. Check the Transfer Image Library tab at the top of the page

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  11. Hi effect layout !
    just want to put the LED like in the original (is a bi-color LED that pulsates with the signal)
    But please i dont understand where i have to wire the fsw1 / fsw2 / fsw3 ? near the bicolor led on the right of PCB…
    Please help me …

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    Replies
    1. Fsw = footswitch. So connect those pads to the corresponding lugs on your footswitch. Then use lugs 4-9 for bypass wiring (4 to the effect input, 5 to input jack, 6 to lug 9, 7 to effect out, and 8 to output jack).

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    2. ok i just understand ! Thanks very much !

      I have a thrue bypass shematic that does not use the same sense of connection and therefore I do not understand why the LED + was falling on a mass ... :)

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    3. Buongiorno, non so se sto facendo la richiesta nel posto giusto, vorrei realizzare il progetto solo che non ho capito come devono essere collegati FSW1-2-3, HI Cut1-2, e EQsw1-2-3-4-5, per fafore mi sapreste dare uno schema.

      Grazie

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  12. Thanks a lot for that perfect layout! Work’s realy great and It sounds...wow!!! I swiped the eq switch, made parallels connections for some resistors&caps not in stock. Just made a mistake with the led (c- instead of c+) it will be fixed with the next order. Thank again for that perfect layout !

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  13. Buongiorno, non così sto facendo la richiesta nel posto giusto, vorrei realizzare il progetto solo che non ho capito venire essere collegato FSW1-2-3, HI Cut1-2, e EQsw1-2-3-4-5, per fafore mi sapreste dare uno schema.
    Grazie.

    Nicolino Pagano - Aquara Salerno

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  14. Question: how did you mount your bi-color LED on the enclosure? I have a 3mm bi-color LED from Small Bear, but it will not fit in a 3mm chrome bezel, and suggestions?

    Thanks

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  15. Hey ran into a snag: I realized that we need a bi-color LED with a common anode, I mistakenly used one with a common cathode so of course the LED did;t work, but neither does the effect. Would having the wrong LED prevent the rest of the circuit from functioning properly?

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  16. Will anyone answer questions anymore? Someone must know the answer to my above question about if having the wrong LED will kill the compressor circuit also???!

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  17. please someone can put a graphic diagram for the 3pdt connection standing, I do not quite understand how to connect.

    excuse my ignorance and thanks in advance

    regards

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    Replies
    1. https://i.postimg.cc/5tR8qS8T/Diamond-Compressor-wiring.png

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  18. hello, please a little help.
    regards

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  19. One final question, maybe someone would know the answer to this: I accidentally put the 100nF cap where the 10K resistor should go up next to the Compression pot, so the two are reversed. They both go to ground, and are attached in parallel with the rest of the circuit so i figured I didn't it matter. My circuit is not working, so would reversing these 2 components cause the circuit to fail? Thanks!

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    1. They're in parallel, so swapping the placement shouldn't make any difference.

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    2. Hmm that's what I figured, but darn thing won't work lol. Oh well guess i have a date with my multimeter...

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    3. Well figured out what the trouble was, i was missing the 10k resistor that connects all the +VB parts of the circuit. Ran out of them and then forgot to add it when i finished populating the board haha. Compressor works! However, the LED does not blink red at all, not sure why. I got the correct (center anode) LED this time, anyone else have trouble with the red part of the LED not working? Thanks again.

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  20. Hi david,
    could you tell me what the value of LDR ? I'm not sure …

    Franck

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    Replies
    1. Look up the datasheet for the VTL5C3. It should tell you the specs for the LDR

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  21. There is a mistake in the upper left layout. The pin 6 of the OP275 cannot connect to +9v.

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