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Projects => General Questions => Requests => Topic started by: Thewintersoldier on March 15, 2021, 09:46:20 AM

Title: Boss ph-1r
Post by: Thewintersoldier on March 15, 2021, 09:46:20 AM
I used to have a boss ph-1r a long time ago, and it was fantastic. How come no one has ever done a project for this, or perhaps the ph-2. What's up with that? What can we do about this? What say you phaser overlord?
Title: Re: Boss ph-1r
Post by: jimilee on March 15, 2021, 10:15:49 AM
I used to have a boss ph-1r a long time ago, and it was fantastic. How come no one has ever done a project for this, or perhaps the ph-2. What's up with that? What can we do about this? What say you phaser overlord?
My buddy has a silver screw ph-2, theyíre pretty founky. They have a few tricks I donít think Iíve ever seen on another phaser. I keep thinking Iíll buy one, but Iím not a boss pedal fan.


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Title: Re: Boss ph-1r
Post by: jubal81 on March 15, 2021, 10:24:49 AM
This is a new one to me, but I like what I see. It's pretty much a Phase 90 with a lot of improvements and more control.
You could even pimp it up further by adding fixed stages or a StompLFO chip.
Two more swept stages and you'd have a PS1-A on steroids.
Title: Re: Boss ph-1r
Post by: Thewintersoldier on March 15, 2021, 11:35:45 AM
This is a new one to me, but I like what I see. It's pretty much a Phase 90 with a lot of improvements and more control.
You could even pimp it up further by adding fixed stages or a StompLFO chip.
Two more swept stages and you'd have a PS1-A on steroids.
I wish I had more knowledge/knew how to do layouts for boards. maybe this would be a good project for someone with the know how to do a board. I would buy one for sure.
Title: Re: Boss ph-1r
Post by: Aentons on March 15, 2021, 02:54:59 PM
Here is my black label (MIJ, ACA) PH-2. I don't excel at tracing but I'm always happy to help with pics or whatever
Title: Re: Boss ph-1r
Post by: jimilee on March 15, 2021, 04:39:35 PM
Thatís a pretty interesting design. Iíve never seen a compander in a phaser.


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Title: Re: Boss ph-1r
Post by: jubal81 on March 15, 2021, 05:16:31 PM
Thatís a pretty interesting design. Iíve never seen a compander in a phaser.


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It's to try to keep the JFETs from clipping.


If you look at the schematic for the PH1-R, there's a divider going into the phase stages that cuts the input amplitude in half. Then there's a boost at the mixing stage. It's an effort to reduce distortion when running JFETs at 9V.


Speaking of which, getting back to then PS1-A on steroids idea, I'd also say add a charge pump for split-supply operation and you'd need a proper sine wave LFO.
Title: Re: Boss ph-1r
Post by: jimilee on March 15, 2021, 05:32:09 PM
Thatís a pretty interesting design. Iíve never seen a compander in a phaser.


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It's to try to keep the JFETs from clipping.


If you look at the schematic for the PH1-R, there's a divider going into the phase stages that cuts the input amplitude in half. Then there's a boost at the mixing stage. It's an effort to reduce distortion when running JFETs at 9V.


Speaking of which, getting back to then PS1-A on steroids idea, I'd also say add a charge pump for split-supply operation and you'd need a proper sine wave LFO.
Now youíre talking. I would play that.


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Title: Re: Boss ph-1r
Post by: Thewintersoldier on March 15, 2021, 07:30:17 PM
this needs to be a project one day
Title: Re: Boss ph-1r
Post by: Aentons on March 15, 2021, 09:13:29 PM
Thatís a pretty interesting design. Iíve never seen a compander in a phaser.

The PH-2 has 10/12 stages and is a different beast from the PH-1r which I think is mostly a P90 like jubal said
Title: Re: Boss ph-1r
Post by: jubal81 on March 15, 2021, 09:43:17 PM
Here is my black label (MIJ, ACA) PH-2. I don't excel at tracing but I'm always happy to help with pics or whatever


Yeah, whole different ballgame there. Looked it up and it turns out those IR3109 chips are quad OTAs designed for filter sweeps and go for about $40 each if you can find them.


The Subdecay Quasar uses modern VCAs in a similar setup. It's a phaser I've seriously considered shelling out some money for.


Title: Re: Boss ph-1r
Post by: rockola on March 16, 2021, 04:13:30 AM
PH-1 (not r) has been done: https://www.freestompboxes.org/viewtopic.php?f=13&t=30116 - I have a half-done PCB in my "some day" pile