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.

Monday, February 9, 2015

Hollis Flatline Optical Compressor

Here's a good, subtle sounding compressor. It uses a LDR and LED to control the limiting done by the effect. You can go the home-brew route and put a LDR and LED in some shrink tubing or there should be enough space to use a VTL5C2 or a NSL-32 photocoupler. Diodes I've listed as 1N34s but any germanium diodes should work.

4 comments:

  1. http://i.imgur.com/pW7gyh0l.jpg
    http://i.imgur.com/wU4w2s2l.jpg

    i use 1n60p instead of 1n34
    when i crank up the sustain it got quite fuzzy

    here is a demo
    clean signal > min. sustain > mid sustain > max. sustain
    (i keep my volume at max)

    https://soundcloud.com/dieppl-1/compressor-demo

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  2. Check out Mirosol's comments on lvlark's layout over on the Tagboard Effects blog.

    http://tagboardeffects.blogspot.com/2012/02/john-hollis-flatline-compressor.html

    He changed the sustain pot to 50k with a parallel resistor to get it up to around 75k to remove the distortion when its maxed. Hope that helps.

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