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Modular synth madness

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Davesax1965 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: May 26 2019 at 02:43
I wish it was, I spend so long in here !! ;-)

It's a Lexicon audio interface. The audio outputs go into this and from there into the PC and Reaper or Cubase. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: May 27 2019 at 10:35
Back in a few months.... ;-)


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: June 01 2019 at 04:11
PS I'm afraid I had an idea and the synth has got somewhat bigger and more complicated since the last post. 

I think I actually DO need a new hobby. ;-)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2019 at 04:17
A very basic first test of the system. Some oscillator scaling (tuning over an octave) issues. Two of eight sequencers being used in the sequencer cabinet (via six oscillators). Two oscillators (out of eight) being used in the main cabinet. 

The oscillators and filters and amps all have to be calibrated - so this is a very basic test. You'll hear some hideous tuning issues in it. This is "barely ticking over", by the way. No added effects, the output goes through a vintage Alesis Quadraverb which is now on top of the synth, making it even taller. ;-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2019 at 04:19
By taller, I mean.....


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Quinino Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2019 at 07:02
Originally posted by Davesax1965 Davesax1965 wrote:


I think I actually DO need a new hobby. ;-)


I told you ... ! LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2019 at 10:32
Naaaah, changed my mind. ;-)

Calibration test. Only two oscillators in the main cabinet calibrated, and they're a bit out. More to do. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: June 09 2019 at 04:36
Calibration time. This is where it gets a little complicated. 

For 8 of the 10 oscillators in the main cabinet, there's quite a lengthy and technical procedure to make them play properly. There are six trim pots here by the red voltage probe. The oscillator cores produce a triangle wave. Using an oscilloscope, you adjust the trimpot to get a good looking triangle wave. You then use another trimpot to set up the square wave duty cycle.

(That's just one oscillator in the photo - the other modules are a filter, amplifier, envelope generators and a low frequency oscillator all commoned onto one panel. All you can see is about 4% of the total electronics in the synth.)

Next step is to adjust the output voltage of the internal temperature control to 0.63v, which I'm doing here. Oscillators drift due to temperature - they have to have temperature control to keep them in pitch. Talking of pitch, another trim pot sets the initial pitch and the remaining two are used to set up the octave scaling and "high end trim", which is the time consuming part. Due to some internal tolerances, I've got to desolder the scaling trim pots and replace them with higher value ones to get enough range to do the adjustments. At the moment, it's not scaling enough and notes go flat as you switch octaves.

So that'll be the oscillators done shortly. The next step is to adjust trim on various filters and amplifiers, envelope generators and a few other modules to get the right kind of response. This varies according to taste, sort of, but lots of fun with an oscilloscope, screwdriver and volt meter ahead. 



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