Boss - PH-1r ( Phaser )  [schematic]

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Boss - PH-1r ( Phaser )  [schematic]

Postby R.G. » 18 Dec 2007, 23:16

The Boss PH-1r schematic is now up at GEO (http://www.geofex.com).

Many thanks to those who helped and offered help in extracting this one. In the end it was a combination of top/bottom shots from the net and the gracious assistance of Ry Hoffman that got this done.

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Postby seniorLoco » 19 Dec 2007, 02:45

Nice one...thanks RG.
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."
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Re: Boss PH-1r Phaser

Postby modman » 22 Jul 2008, 15:14

Some pictures:
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Re: Boss PH-1r Phaser

Postby Dirk_Hendrik » 23 Jul 2008, 16:59

I know it's an older post but nevertheless RG's work enabled me to fix one of these in some 15 minutes. Thanks RG!
Sorry. Plain out of planes.

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Re: Boss PH-1r Phaser

Postby PmCimini » 17 Aug 2008, 08:39

first boss pedal i see that uses 4558 instead of their trademark M5218. hah, interesting
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Re: Boss - PH-1r ( Phaser )

Postby KHELSTROM » 23 Mar 2009, 21:31

Does anyone have a schematic for the original 2 knob version PH-1? I have one in for a repair.
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Re: Boss - PH-1r ( Phaser )

Postby R.G. » 24 Mar 2009, 18:37

KHELSTROM wrote:Does anyone have a schematic for the original 2 knob version PH-1? I have one in for a repair.

No, but a few good high res photos of the component and trace side of the board and answering a few component questions would get it for you.
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Re: Boss - PH-1r ( Phaser )

Postby Ry » 25 Mar 2009, 03:45

I have a schematic, layout, and calibration data for the PH-1. I don't have an easy means to post it, if someone contacts me, I will gladly email these for posting somewhere.

Ry

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Re: Boss - PH-1r ( Phaser )

Postby borislavgajic » 26 Mar 2009, 16:40

Thanks Ry..... :thumbsup

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Re: Boss - PH-1r ( Phaser )

Postby lynessmy » 02 Feb 2010, 11:36

Not sure how this is gonna help. Just want to share what is on my hand.
These photos are snapped from MIJ - Jan 84's. (SN:389400).
Slightly different chips brand compared the the earlier units as shared by modman.
High resolution image can be email upon request (~4.4M per pcs).
Enjoy.
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Re: Boss - PH-1r ( Phaser )

Postby salocin » 02 Feb 2010, 11:55

Excellent quality pics! :thumbsup
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Re: Boss - PH-1r ( Phaser )

Postby pedalist » 05 Feb 2010, 12:36

Is boss ph-1r pcb available, please?
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Boss PH-1 phaser gutshots

Postby Nocentelli » 03 Jan 2011, 16:29

Found these on Bossarea:
component side.jpg

trace side.jpg

off-board wiring.jpg
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Re: Boss PH-1 phaser gutshots

Postby electrosonic » 03 Jan 2011, 17:32

I have one of these open on my workbench if anyone wants more pics. Mine only works while the footswitch is held down, so I am tracing out the flip flop area.

Andrew.
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Re: Boss - PH-1r ( Phaser )

Postby recontravintash » 26 Jan 2011, 20:13

Hey! I want to make a copy of this pedal, I'm thinking about put it into a hammond-type enclosure... so my question is, what's the size of the PCB? which hammond-like box would fit to the pcb?
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Re: Boss - PH-1r ( Phaser )

Postby Duckman » 26 Jan 2011, 21:40

recontravintash wrote:so my question is, what's the size of the PCB?


It's a Boss pedal... What you think? :lol:
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Re: Boss - PH-1r ( Phaser )

Postby recontravintash » 27 Jan 2011, 04:06

:hmmm:
oK, it's time to open for first time a boss pedal, not for having to guess that much :D
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Re: Boss - PH-1r ( Phaser )

Postby fuzzbuzzfuzz » 23 Apr 2011, 06:25

Nice post guys - some great info on a great sounding pedal! :D

I recently picked up a PH-1 - but it has a fault which I`m hoping to fix with a little help ;)

Simply put is that when either on or off the signal running through has an element of distortion noise, esp when I twang a low E. Its a fuzzy buzzy noise, not over the top but strong enough to be noticed. If I play softly its ok, but otherwise pretty useless as it ruins the bypass signal and phased signal.

Any ideas? I`ve resoldered the AC jack connections and given the jacks a clean. A suggestion has been a dry Cap somewhere. Can I find and isolate with a multimeter? (excuse my technical ignorance! :oops: )

Would love to get this one working again, any help is really appreciated!

Gut shots on here: http://fuzzbuzzfuzz.blogspot.com/2011/02/boss-ph-1-phaser.html

Thanks!
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Re: Boss - PH-1r ( Phaser )

Postby blackbunny » 25 Apr 2011, 04:01

fuzzbuzzfuzz wrote:Simply put is that when either on or off the signal running through has an element of distortion noise, esp when I twang a low E. Its a fuzzy buzzy noise, not over the top but strong enough to be noticed. If I play softly its ok, but otherwise pretty useless as it ruins the bypass signal and phased signal.


If it's a PH-1 phaser, it will distort when used with a high output pickup. Boss changed the gain structure inside the pedal so that the later PH-1r has a voltage-dividing stage that halves the signal level being phased by the JFET's, and boosts the signal back up again at the output.

My PH-1 sounds exquisite with "vintage" style single coils or low-output humbuckers, but has a buzzy / farty low frequency distortion with high output pickups. My PH-1r sounds cleaner and slightly brighter, but will still distort with a big chord smash from a high output pickup.

You might be better off looking for a PH-1r, unless you use very high output pickups, in which case it might be best to look for a phaser that doesn't use JFET's.

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boss PH-1r pcb

Postby pedalist » 09 May 2012, 17:32

Hi all I'm looking for boss ph-1r pcb and layout that have send?. Thanks
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