Build Your Own Clone Message Board

This one builds on the Wobble Vibe circuit:
viewtopic.php?f=41&t=32835

The PunyPhase has two phase shift stages instead of just one (as in the Wobble Vibe). It's definitely a phaser, but also does a nice vibe sound at higher speeds. You can tweak some cap values to make it sound more vowely like a wah, or more shimmery like a traditional phaser.

Instead of the usual feedback to ramp up the overall depth, the PunyPhase uses feedforward. It's a nice way to kick the effect up a notch. Apparently, traditional feedback doesn't really work very well with only 2 stages of phase shift. Go figure.

Here's a clip:
http://soundcloud.com/effdub/punyphase-v1-demo

Schematic is attached.

I also have just tested a 3-stage version that is a decent bit more pronounced. Actually I did two different 3-stage versions, but one is noticeably better, so we'll just go with that one. Details on that to follow.

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Function f(x)
TightCamera - Gear Reviews

Looks cool, I have most of the parts in the bin, but you are going to have to explain it a bit. I see 2 LDR's (Light dependent resistors?). I have yet to use/understand those.
-P

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Technically, I think this circuit is really a vibrato with feedback. It's phaser-ish. But it does some neat sounds, I think. And not FET matching!



When exposed to light, they have a very low resistance. When dark, they have a very high resistance. So when a light source (LED in this case) cycles between light and dark, you get a constantly changing resistance from the LDR.

In this circuit, the variable resistance is used to mix more or less signal from the transistor's emitter with the signal from the transistor's collector. In a common emitter amplifier (such as what we have here with the 5089s), the output from the collector will be 180 degrees out of phase with the input, while the output from the emitter with be in-phase with the input. So basically, the LDR is varying the retain of in-phase to out-of-phase. And when you do that at the right speeds, you end up getting a neat vibrato / tremolo / phaser-ish sort of sound.

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Function f(x)
TightCamera - Gear Reviews

So do you set it up so that the LED is between the 2 LDRs inside the enclosure?
Cool

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Exactly.

And here is a clip of the 3-stage version:
http://soundcloud.com/effdub/punyphase-v2-1-demo

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Function f(x)
TightCamera - Gear Reviews

Tres Cool

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"Spud knows tone"

codtone.com

just breadboard'd this guy. Any layout (vero or perf) available yet?

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BH4RJ

How does it sound to you? Is it a pronounced effect or more subtle? I find the two-stage version to be on the subtle side, but still pretty cool.

Since you've got it on the breadboard already, here's the more advanced version I linked a clip of previously. Shouldn't be too much extra work to get another stage going and add the boost and feedback. It's really quite phasery and also a bit of tremolo tossed in.

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Function f(x)
TightCamera - Gear Reviews

definatly a subtle phase. which i like. I dont really need a van halen super over the top fuzz.

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BH4RJ

At least try adding the feedback (Depth pot on the fancier version). I think that will give you a little more phase if you want it, or you can still dial it back.

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Function f(x)
TightCamera - Gear Reviews

Ok ok ok.
I didnt have time to breadboard v2.2 but I did my first attempt at a vero layout. Bear with me, it aint pretty. unverified of course.

I guess you'll have to extend the led and lrd's so they are facing each other, correct?

trace under c5, c11=100uf, ignore the "lrd2", it should be "ldr2"

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BH4RJ

Awesome!


Yep. They look pretty far apart in the graphic, but I'm thinking that the actual build will be pretty small, so it should be fine.

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Function f(x)
TightCamera - Gear Reviews

do you see anything innaccurate with the vero, at first glance?

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BH4RJ

Thanks for sharing CJ!! I really like both sound clips..and I've been wanting an easy phaser or vibe for awhile. This is defnitely going on my to-do list!!
Looks pretty good mafew! The only thing I see that's incorrect is the connection of depth pot lug 2. It's going to d22 but should be e22 on the same strip that c7 and c8 junction.
I'm a bit confused about the LFO, they are still new to me. I thought the signal would flow into it but the only connections I see are 9v, GND from the IC. Am I right in guessing the connection is between D1 (LED) and the 3 LDRs? If that's the case it would probably be practical to create a little daughter board (vero/perf) with the D1 in the middle and the LDR surrounding it.

I got my prototype PCBs recently and had a chance to build one up. It's 99% done, I just need to adjust the bias in the boost stage at the end of the circuit and tweak the value of the Shape pot and the limiting resistor.

But, what's really cool is that the Depth control (which is really feedback) can make the circuit either be a vibrato or a phaser/filter (very wah-like)....and you can also get somewhere in between, which is interesting.

Once I have it fully nailed down, I'll post a new schematic. The only thing that will change will be some resistor values, but I'll still post a final update.

Gonna have to change the name too, since now it's a vibro-phase.

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Function f(x)
TightCamera - Gear Reviews

Nice. Can't wait to hey my hands on a pcb.

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BH4RJ

Go CJ!!
Can't wait to paypal you again, been alot of that lately

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Sign me up for a PCB if you make a run

Done! Well, as done as any circuit ever is.

New schematic coming in the next couple days.

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Function f(x)
TightCamera - Gear Reviews

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BH4RJ

I should say that this circuit is more for the guys who like to tinker and tweak. The "stock" values will yield a cool pedal. But there are a lot of variables involved: the resistance range of the LDRs, the brightness of the LED, some of the cap values, etc.

So if you like to much around with sockets and test things, this is one you will enjoy. It can go from wah-like vowely sounds, to phasery tones, to pitch-bending vibrato, and all of it has a dash of tremolo thrown in.

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Function f(x)
TightCamera - Gear Reviews