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, May 18, 2015

Lovepedal/Hermida Audio Zendrive

Got a request for this one. The Zendrive is a low-to-medium gain overdrive, delivering blues to jazz tones. It has an interesting clipping section, using a combination of diodes and MOSFETs in an asymmetrical arrangement. I've drawn the layout to accommodate board mounted pots (from the solder-side) and it will fit easily in a 1590b.


25 comments:

  1. Awesome! I love this one, one of my favorite overdrives. One thing to note is that the first diode below the 1k resistor should be germanium, not a schottky. Almost all schematics for the Zen Drive shows the 3 diodes as schottky, but I had some originals on my hands and they all had this combination of 2 bat41 and 1 1n34a

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    1. Thanks Guilherme! Thanks makes the clipping section even more interesting.

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  2. It really doesn't make a night and day difference because the fw voltages from the diodes are actually close, but with good phones or playing loud you can actually perceive a change in the compression and overall feel

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  3. Hey! This was my request!
    Thanks so much for making this layout, my friend. I really appreciate it.
    I'm going to build one asap. :)

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  4. I don't know why, but I decided to check this one again, and there's two other corrections I want to point out. At least at the Lovepedal version, the IC isn't sanded, and it's a NE5532. And the volume pot is Linear, if you use Log, it does next to nothing in the first half of the rotation, and by the end of it there will be a sudden jump in volume. Been there, done that, hehehe. I'll try to verify this nice layout ASAP!

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  5. Hi,

    Can I replace the BAT41 with a BAT43? There will be much of a difference in sound? Thanks.

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    1. They're both schotky diodes, so there shouldn't be much difference.

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  6. It's verified. I did not have much time to test it with a decent amp. so I 'm not commenting on how it sounds.
    by the way the pcb layout is a work of art. it is pure ZEN.
    thanks a lot.

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    1. I see what you did there ;) Thanks for verifying!

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  7. hi friends, the Ic AD712 is not avaliable in my usual shops. one replace? Thx!! this place is the best for DIY lovers ; )

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    1. You can try just about any dual opamp. TL072, NE5532, even a JRC4558.

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  8. Hi guys! I'm sorry i'm very, very beginner, so i would be very, very happy if someone can help me with linking the schematic to the pots, LED and.. the switch.. Maybe a hand-drawing will be greatly appreciated! Thank you!!
    Joe

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    1. The pots can be wired to the board with hookup wire or if you get right angle PCB mount pots you can hard mount them to the board. Google is always your friend with things like this. But also check out the General Layout Notes tab at the top of the page. Lots of info there.

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  9. Hi, I noticed the word 'ZENDRIVE' is not mirrored on the transfer image. I only realized this after etching one.

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  10. Does the gain work in reverse? I built one using the above layout and using pcb mount pots.

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    1. Yeah, looks like I got the pot lugs reversed when I laid this out originally. Fixed it. Thanks for catching that.

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  11. in most layouts are 3 resistors 1k and 3 resistors 10k . What is the difference for this?

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  12. Very cool nice tone ! Whats the name of your Jam track ??

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  13. I could not find diode BAT41. is there one instead.??

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  14. I could not find diode BAT41. is there one instead.??

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    1. You can socket those diodes and try out whatever you have on hand. 4148s, 4001s, etc.

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  15. Thanks for the advice.. I will try..

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  16. Thanks for the advice.. I will try..

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  17. Maybe I'm wrong but I think the 1K resistance to the 3-tone connection should be 10K

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