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.

Tuesday, January 29, 2019

HomeBrew Electronics Detox EQ

Here's and interesting 3-band EQ from HomeBrew Electronics. They say it's like adding a second channel to your amp, cleaning up a dirty signal with the level turned down. Think the opposite of an overdrive or distortion pedal. Should fit nicely in a 1590B or 125B. Schematic for reference.



24 comments:

  1. the only problem is that i cant find easy the ic of all circuits here in Greece!

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    1. Could use a TL072 as replacement, much more common apparently... i googled 'JRC4558 equivalent' and that was most common. I too am wondering if that would be an ok replacement as i might build this one. Very handy tool to have on the pedal board.

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    2. Tl072, tl082, rc4558, ne5532, etc...

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    3. I believe the closest is probably NJM4558, and plenty are available on Digi-Key.

      JRC = "Japan Radio Corporation"
      NJM = "New Japan Media"

      I think they are actually the same company, just changed names.

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  2. Interesting!! Shall we go?
    Ok, I'll give it a shot

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  3. So glad to finally see this. I used to own this and regret getting rid of it. It was the smartest pedal on my board

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  4. Ive built this, and everything works like it should, but its a little noisy. Noisier than i think it should be. Ive swapped ICs with no luck, and it only gets slightly better when powered by a battery. Would bigger electro caps help? Im using small ones but they are still rated at 50v. Any help would be appreciated. This circuit cleans up a dirty amp beautifully. Thanks!

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    1. You could try a larger cap or add a like a 100nF cap from 9v to ground. That might helps as well. Is it boxed yet?

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    2. I have not boxed it yet. You mean a 100nf cap in parallel with a larger 100uf cap from 9v to grnd? Ive seen that before but when testing on my breadboard, i couldnt hear any differance. Will it matter more once its boxed?

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  5. Verified. Bad with ss amp, but just perfect with Marshall jcm800 2204. From pre-amp drive on 8-9 to clean with minimum volume drop. Very usefull pedal.

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  6. I recently built this and it performs well. I mostly followed the layout but did move a few things around. I later realized I had used a 27k resistor instead of the 27ohm. Quite a difference in value but as I said it works well. So I'm wondering how this affects the tone/output/etc. Can I get some input/opinions on why I should (or should not) take the time to "fix" my error and change it to the correct value. Thanks for your input and thanks for this wonderful blog.

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  7. Thanks. To anyone building this off the Perf guide just note that the 470pf capacitor on the bass circuit is in the wrong place.

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    1. what's the right position? i'm about to build it

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    2. Hi, if you follow the circuit to the right of the perf guide you can see where it should be.

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  8. I have finished this project, but the level is too small, is there any way to improve it

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  9. I have finished this project, but the level is too small, is there any way to improve it

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  10. I have finished this project, but the level is too small, is there any way to improve it

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  11. Verified.. works good... is there any way to increase bass?

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  12. Bass and mid arent doing much of anything

    Treble works great

    Anyway to fix it?

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    1. Sry it works good

      Somehow my 47k and 4.7k were in same place i accidently replaced all 4.7k for 47k..


      It works like charm now

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