Boss ph-1r

[Thewintersoldier]

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?

[jimilee]

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, they're pretty founky. They have a few tricks I don't think I've ever seen on another phaser. I keep thinking I'll buy one, but I'm not a boss pedal fan.


Sent from my iPhone using Tapatalk

[jubal81]

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.

[Thewintersoldier]

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.

[Aentons]

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

[jimilee]

That's a pretty interesting design. I've never seen a compander in a phaser.


Sent from my iPhone using Tapatalk

[jubal81]

That's a pretty interesting design. I've never seen a compander in a phaser.


Sent from my iPhone using Tapatalk

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.

[jimilee]

That's a pretty interesting design. I've never seen a compander in a phaser.


Sent from my iPhone using Tapatalk

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 you're talking. I would play that.


Sent from my iPhone using Tapatalk

[Thewintersoldier]

this needs to be a project one day

[Aentons]

That's a pretty interesting design. I've 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

[jubal81]

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.

[rockola]

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