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, February 1, 2017

Crowther Audio '03 Hot Cake

I laid out the original 1977 Hot Cake a while back, but never got around to doing the modern one that came out in 2003. So here's the newer one. I ignored the original relay bypass switch and the polarity protection diode could be replaced with a 1N4001 or similar. The original 1N5238 is an 8.2v zener. It's laid out for board mounted pots as usual, and should be an easy fit in a 1590B. Here's the schematic for reference.


10 comments:

  1. Dirty Little Secret MkIII Please!!!

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  2. New Hot Cake is so damn good. I haven't heard a 70s one but I'm sure they rule too.

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  3. Cool, thanks for another great one.
    And I see I've got all parts in my stash. Even better ;-)

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  4. Hi man, great post as usual. I'm an avid follower of yours and tagboardeffects blog. I've already built this pedal once some time ago and it truly is a good sounding pedal. I would like to know how can i increase maibe the highs and mids of this pedal. Since I play with humbuckers, the pedal kinda sounds too dark imo. So, if you can give me a tip where i can do some experimenting, i would apreciate a lot. Thanks man!

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  5. There's a couple caps you could experiment with. I'd start with lowering the value of the 22n cap coming off lug 3 of the Presence pot and play with the value of the 56n cap that goes between Presence 2 and Level 3.

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    Replies
    1. Thank you very much for the response, I'm gonna test it as soon as I can! Cheers mate

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    2. Another question that has just come up, if I wanted to increase gain, how could it be done?

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    3. That I'm not sure off. Look at the schematic and maybe adjust the values of the components going to the gain control from the IC. Maybe adjust the value of the 100k resistor right above the IC as well. You'll have to experiment.

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  6. This weekend I made three circuits right away, this was the first, and it worked the first time, the sound is really very special, it happened to be one of my favorite overdrives. As it has no clipping diodes, not much that can be changed, I tested the sound with an OPA134, but it got worse, it shows much more the background noise and it gets very sharp and annoying, there is nothing like the old TL071.
    For gain control, I did not have the C50k but I had read on another site that a B10K had the same effect, and it worked perfect.
    Thanks for your excellent circuits!

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