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, August 8, 2016

DOD 230 Optical Noise Gate

Not a lot out there on this one. It's a optical noise gate DOD produced in the late 70s and works best at the beginning of your signal chain. The original had a very strange way of bypass switching, but I've omitted this as your true-bypass method of choice is probably much superior. Originals used a VTL5C2, but experiment with LED and LDR combos, and possibly the value of the resistor feeding the LED (10k right above the LDR and Q1).


  1. another layout using LDR.
    can one of these be used?

  2. Can I use a tl072 instead of the tl022?

  3. Verified. I used two Tl72 and a green LED with a 5/500k photo resistor. So far I prefer the one knob noise gate. The attack on this one seems slow and the threshold seems low. I'm not sure how the selection of of Octocoupler and threshold pot effects this. More noise gate layouts would be awesome if you feel so inclined. I would love to do a comparison vid!