Getting started building CGS modules [Build Thread]

[AlanP]

Did you solder the wire links in?

[Schläfer]

By wire links you mean jumpers?
if so yes i did

[Schläfer]

Btw my power source is +12/-12, but i doubt it is the problem, as i read in the cgs website it should operate fine at these voltages.

[Schläfer]

Everyhting working !

Of course it was some sloppy soldering from my part
Still have some problems to tune the cycle function but i'm not far anymore at least.

One more to go for the full dual function generator to be able to play with tasty feedback loops

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[Hubaswift]

Awesome! Glad you got everything working! I already have enough on my plate right now, but once I've finished what I've started I think I may put together a VCS for use in my MU modular. Again, thanks for submitting the pcb layout!

[Thinredline]

DUSG Working for me! Although might switch out the trimpots to diff ones, if i trim it too much i get no sound...not sure if thats a normal operation or not.

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[haebbmaster]

Cool. DUSG is fun!

[The Bad Producer]

[Hubaswift]

So it has been a while. This project got shelved as my interests turned more towards arcade machines for the past couple of years, but I've finally gotten off my ass and picked this project back up. Gotta finish what I started, especially when I was so far along. Since last time I've done a ton of front panel wiring, built a mohogany enclosure (still have to sand and clear-coat it), I also replaced all those cheap banana jacks with the emerson ones that were recommended. Much better! I'm going to have to do something creative to fit all the pcbs in there since I've still got boards for 3 mixers, two envelope generators, and a headphone amp that need to go in. I'm sure I can squeeze it all in there...

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[Ayab]

Glad to see you continuing project Hubaswift! Good work!

[Hubaswift]

And it breathes its first breath. A nice crisp saw wave. Didn’t have time to do any calibration or testing before heading off to work, but so far it’s looking good. I realized I have an extra jack on my panel since I was under the impression that the oscillator had a dedicated square output that wasn’t affected by pwm. This isn’t the case so I may just throw together an additional saw to square converter just for that fixed square output.

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[Hubaswift]

Knobs came in! Still waiting on those 2M ohm pots for the envelopes to come in alongside the connectors to start hooking up the modules to the power supply. The first DUSG I put together isn't working so I'm gonna have to do some troubleshooting later on and figure out what the issue is with that.

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[Ayab]

What a lovely really professional looking result. Good work to aspire to.

[Hubaswift]

Thank you! It's been very slow progress as aside from other hobbies I have many projects within the synth and musical domain I'm going through all at the same time... but I have gotten a few more of the modules wired and tested. It appears I have some crosstalk so I'm going to need to get a better grounding and power distribution system in place, maybe alongside a better power supply too.

[Hubaswift]

So, not much real work has been done lately on this, and that's because I was honestly disappointed with some of the results. The main one being the oscillators which have a few issues to address. The frequency range is much too large with only a portion of it being audio (easy resistor value change) but the real problem I have so far is the sub oscillator. Ken states that it will not cover the entire range of the VCO which is fine by me, but judging by my results that is an understatement! It hardly tracks alongside the VCO at all... May be an error on my part, I hope it is. That is a pretty big hit to the functionality of the module as many jacks and a few knobs are designated for sub osc purposes. I'm hoping it's a mistake I've made and not just the design. Of course I have played with the trimmer associated with this functionality, but I can't get it to even be really usable.

I have had a lot of motivation recently but have been directing it elsewhere. Namely a ribbon controller board, synth voice pcb (that I will be using alongside the ribbon controller), Expanded version of the Ian Fritz Tri-Core VCO with sine and Pulse outputs, and starting a video synthesis rig. I still have a goal in mind to finish this project but have no plans as to when it will happen.

[Ayab]

Am sure you will get those issues ironed out.

Think I have seen your ribbon controller project on mod (muff's)?

Video synthesis is really interesting - I love the surreal look of some of the effects that can be done. I am personally trying to to hold off from getting into it for fear of an even larger backlog!

[Hubaswift]