Boss - PH-1r ( Phaser )  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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R.G.
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Post by R.G. »

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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seniorLoco
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Post by seniorLoco »

Nice one...thanks RG.
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."

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modman
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Post by modman »

Edit January 2021: Attached pictures of my original post were lost
Note that the original services notes have turned up.
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal

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Dirk_Hendrik
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Post by Dirk_Hendrik »

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.

http://www.dirk-hendrik.com

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PmCimini
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Post by PmCimini »

first boss pedal i see that uses 4558 instead of their trademark M5218. hah, interesting

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KHELSTROM
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Post by KHELSTROM »

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

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R.G.
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Post by R.G. »

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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Ry
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Post by Ry »

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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borislavgajic
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Post by borislavgajic »

Thanks Ry..... :thumbsup

boris
Attachments
PH-1-Schem.pdf
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PH-1-Layout.pdf
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PH-1-Info.pdf
(68.29 KiB) Downloaded 647 times

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lynessmy
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Post by lynessmy »

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.
Attachments
PH-1R Component Side
PH-1R Component Side
PH-1R Trace
PH-1R Trace

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salocin
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Post by salocin »

Excellent quality pics! :thumbsup

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pedalist
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Post by pedalist »

Is boss ph-1r pcb available, please?

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Nocentelli
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Post by Nocentelli »

Found these on Bossarea:
component side.jpg
trace side.jpg
off-board wiring.jpg
off-board wiring.jpg (66.19 KiB) Viewed 6790 times
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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electrosonic
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Post by electrosonic »

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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recontravintash
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Post by recontravintash »

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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Duckman
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Post by Duckman »

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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recontravintash
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Post by recontravintash »

: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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fuzzbuzzfuzz
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Post by fuzzbuzzfuzz »

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/2011/0 ... haser.html

Thanks!

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blackbunny
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Post by blackbunny »

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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pedalist
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Post by pedalist »

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

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