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, April 5, 2017

What the Wah?

Hadn't done a wah in a while and thought I'd do project where you can build several old school wah circuits on the same board. Many of the early wahs back in the late 60s were based on the original Thomas Organ CryBaby, and as a result many of them follow the same topology with a few value changes. Here's the schematic:


A lot of the original transistors used have a BCE pinout, so I've made 2 layouts: one for BCE and one for the more common CBE pinouts. Generally speaking your just need transistors in the 300-400 hFE range, however with many circuits, different transistors offer different flavors. So as always, socket and experiment.


10 comments:

  1. What is the value of the components? Tanks

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    1. Clink the link at the bottom of the post for the full build document.

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  2. Which is the function of d1?

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    1. Hey Jörg, I think you're new around here, as I don't think I've seen you comment on anything else before. The way this site works (much like the Tagboard blog) is I create a layout and post it. Sometimes I'm able to build it before publishing, but far more often than not I publish layouts unverified. That's why there's a Verified or Unverified tag on every post. Other people build them and give me feedback. Generally things work fine right away (there are over 350 verified layouts on this site), but sometimes I miss something (apparently an open feedback loop in this case). When that happens I do my best to go back fix things, especially when the error is clearly pointed out. Telling me I need to read a book on electronics and whining about having to troubleshoot doesn't help your case and quite frankly is going to get you ignored. Troubleshooting is a reality in this hobby, even when you're building a verified layout. If that's too much of a risk for your liking, I suggest going somewhere else for your boards or draw them up yourself. I won't be offended. However, if you want to contribute to the community here, posting how you fixed it would help not only me to correct the layout but others who may have built this and also couldn’t get it working.

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