Gristleizer PCB group buy? Who's interested?

[Taylor]

There's no dedicated LFO out, but the optional "de-tick" cap is attached to the LFO, so you could take the LFO from that pad. I suppose that point could also be a CV in. The wiper of the depth pot is also a spot from which you could take the LFO.

This is what I meant "any last thoughts" yesterday, but unfortunately I've already placed the order, so no mods can be done to the PCB. Still, the pads for the speed and depth pots can be used with some additional wiring to provide CV insert points for modulating everything. All the pots are voltage dividers rather than variable resistors, so that makes adding CV fairly simple.

I haven't played around with modular kind of stuff in a while, but some interesting things often come from modulating an LFO with itself, so you could, for example, pipe the LFO into its own speed pot maybe?

[jacobyjd]

definitely, Taylor.

I'm not really speaking in terms of mods to the OCB--in fact, I think any changes to it would have been too much. Things like CV ins and outs can be added as daughter boards or by other methods--it IS cool that there are several pads that, if left unused, could serve as insert points--that's beyond most PCBs. However, if you add too much, it becomes a pain for the person who wants to build it stock...and it leads to BUMS. :-P

[Taylor]

Is that an acronym, or do you just mean HOMELESS PEOPLE?

[jacobyjd]

I think it's an RG-coined term. Blind Urge to Mod Syndrome.

[myka-x]

Put me down for 1.

Thanks,
~David

[Strategy]

i typically prefer to build things stock, but where there's an easy opportunity (like the ones you mention- that is great, pretty much all that's needed) to bring an LFO to the front panel, I like to- a nice thing to have extra of in a jiffy. The multiple wave shapes will be great.

Generally I'm pretty timid about mods and would rather just get a pedal up and running without doing a chop job on it. The idea of getting something up to speed and then potentially ruining it with a bad hack makes me cringe. Bringing internal CVs to a front panel jack seems like some low impact (non pcb altering) goodness.

- Strategy

[Wimpy]

Me want one too, yes!!!

[markeebee]

I'd like two please.

Sorry, originally I said four (first page) but times are tough.  So just two, please.

[tiges_ tendres]

I'm still in for three. 

Thanks!

[Ben N]

As before, I'm in for one.

[sync24]

noob here, spotted you rpost over on electro-music forum, and i'd be up for a board to build 
cheers!

[Taylor]

Ok, thanks for the interest everybody. The boards should be in hand in about a week and a half I'd guess. At that point I'll have instructions on how to place orders, and I'll post all the necessary build info.

[jacobyjd]

Ok, thanks for the interest everybody. The boards should be in hand in about a week and a half I'd guess. At that point I'll have instructions on how to place orders, and I'll post all the necessary build info.

Taylor,

Thanks again for doing all of this. Seriously. It was a lot of fun putting my first one together, and I can't wait to see how my next two turn out. The improvements you made and the amount of work you put into a project for the sole purpose of distributing it to the community is something that everyone who gets a board should value. I'll be looking forward to getting mine

[Taylor]

Well, I don't know that anything I did was that significant. I still consider myself a noob with electronics, so I enjoy any chance to get a deeper understanding of things. Digging into circuits to do layouts really is helping me to understand things better.

For example, I wasn't really familiar with the Gristleizer before doing this. Doing the layout, I discovered that this is a very smart, efficient design. Very few parts for what it does.

I'd be up for doing another of these board designs if anybody can think of another circuit that could benefit from a double-sided layout.

[Ben N]

Well, I don't know that anything I did was that significant. I still consider myself a noob with electronics, so I enjoy any chance to get a deeper understanding of things. Digging into circuits to do layouts really is helping me to understand things better.

For example, I wasn't really familiar with the Gristleizer before doing this. Doing the layout, I discovered that this is a very smart, efficient design. Very few parts for what it does.

I'd be up for doing another of these board designs if anybody can think of another circuit that could benefit from a double-sided layout.

Correction:" You WERE a noob. Now you're a guru.  Y'know what they say in medicine: See one, do one, teach one.

[Strategy]

I'd be up for doing another of these board designs if anybody can think of another circuit that could benefit from a double-sided layout.

One project that I've noticed is missing from the DIY universe is the Mu-tron Octave Divider. If you search in the forum, there have been more or less stalled attempts with a lot of hand-drawn materials. I can't remember what the questions or stopping points were that prevented people from proceeding with a layout. It is also absent from the web's DIY world in general. I don't believe there are any effort-stopping obsolete parts or anything involved.

I do have an electronic version of the schematics and service document but I don't feel I yet have the capabilities to create a layout. It's open to debate whether this is a good candidate project. In favor is that Mu-tron designs are sick, and this pedal sounds amazing. "Con" arguments would be that there's a ton of neat, easy octave projects already out there, like the original CMOS type octave designs on this forum, etc.

Just thought I'd mention that one as an obvious "never/seldom been done circuit- has no current layout" pedal.

- Strategy

EDIT: PS, I don't know if the layout needs to be a double-sided, manufactured PCB per se, but a layout of any sort would be popular.

[Taylor]

Correction:" You WERE a noob. Now you're a guru.  Y'know what they say in medicine: See one, do one, teach one.

Hmm, well, don't know about that, but I do appreciate the kind words! 

One project that I've noticed is missing from the DIY universe is the Mu-tron Octave Divider. If you search in the forum, there have been more or less stalled attempts with a lot of hand-drawn materials. I can't remember what the questions or stopping points were that prevented people from proceeding with a layout. It is also absent from the web's DIY world in general. I don't believe there are any effort-stopping obsolete parts or anything involved.

I do have an electronic version of the schematics and service document but I don't feel I yet have the capabilities to create a layout. It's open to debate whether this is a good candidate project. In favor is that Mu-tron designs are sick, and this pedal sounds amazing. "Con" arguments would be that there's a ton of neat, easy octave projects already out there, like the original CMOS type octave designs on this forum, etc.

I'll check into that.

[Strategy]

Let me know if you want me to email the Octave Divider pdf I have. I can't remember if it came from experimentalistsanonymous or somewhere else, people forward me Mu-tron related things from time to time knowing I'm a fan...

It's often mentioned as a bass player's octave pedal, if that makes it any more appealing! 

- Strategy

[Strategy]

I'll put one more idea, maybe more ambitious, has maybe been done: pull the Korg MS-20 pitch to voltage converter and make it a seed circuit for a guitar synth project. I know it's not the best pitch to voltage conversion, but it's so fun and one of the coolest things about the synth. I often run guitar and bass into it to play the synth. It has difficulties, but it's part of the fun.

could there be 'demand' in the forum community for something based around this? is it already out there?

- Strategy

[Rectangular]

I'll put one more idea, maybe more ambitious, has maybe been done: pull the Korg MS-20 pitch to voltage converter and make it a seed circuit for a guitar synth project. I know it's not the best pitch to voltage conversion, but it's so fun and one of the coolest things about the synth. I often run guitar and bass into it to play the synth. It has difficulties, but it's part of the fun.

could there be 'demand' in the forum community for something based around this? is it already out there?

- Strategy

I would second this suggestion.  the MS-20's pitch-to-voltage converter is very unique, and is probably the second most important module that synth (the first being it's sallen-key filters, which have already been cloned to death).  I have not seen any major DIY effort to clone this module, save for perhaps Juergen Haible's MS-20 clone. I just checked my schematics, it uses a crazy 4-gang pot, and another 3-gang pot. so those would have to be sourced, or a workaround would have to be found.  a lot of people buy MS-20s just for the weird pitch-to-CV effects that synth generates.   

That particular pitch to voltage converter is also the centerpiece of Korg's X911 analog guitar synthesizer, which itself is pretty rare and expensive.  just in case any of you were questioning how applicable the circuit was to guitar effects usage.