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.

Thursday, December 18, 2014

MXR Phase 45

I've seen a lot of different PCB layouts online for this effect, but all of them had at least one jumper on the board. Jumpers aren't the end of the world, but I know for me, if I'm going to go to all the trouble of etching a PCB, I don't want to mess with jumpers. This layout is jumper-free and will still fit in a 1590B type enclosure.

MXR released the Phase 45 along side the more famous Phase 90 in 1975. The name comes from the number of degrees of the phase shift it's capable of. Some say it's similar in sound to a UniVibe and can be modded into being more of a vibe pedal.

The original units used 2N5952 for the FETs (make sure you match them by the way), but others can be used. I listed 2N5457 in the layout because they're what I have on hand. MPF102, J201, or 2N5458s could also be used. Really, any FET with the DSG pinout.




If you want, you can hardwire the C500k pot to the top of the board, though I would suggest using a long leg PCB mount pot (like these) and mounting it above the component side of the board (like this).




11 comments:

  1. Hi, do it yesterday, works but has a notable volume drop, the same issue than the tonepad layout, so you got to change the 2 last 10k resistors for 1k5 ones, and the last 47n cap for a 10uf electrolitic, do this and works faim!Thanks!

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    1. Thanks for verifying! Fixed the layout with those changes.

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    2. hi Mod, you build this with 2n5457 how's it sound?
      i build tonepads ross phaser because it uses lm13600 which is easy to find

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    3. 5457s will work fine. Just make sure they're matched. This uses the TL072 which is one of the most used dual opamps ever. Should be super easy to find.

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  2. same layout but i substituted Transistor to BF245C & its work https://www.youtube.com/watch?v=C5Hb9UtoGXk

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  3. Please update the transfer image.

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  4. Hello
    Assembled as on the scheme, but instead of 2N5457 used BS170
    Works, but when I play a chord - there are noises
    What could be the problem?

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    Replies
    1. Your replacement: 2N5457 are Jfets, and BS170 are Mosfets.
      Instead 5457's you could try BF245, MPF102, J201.

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    2. So the whole thing is obtained in the difference between MOSFET and JFET transistors?

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