The build probably would’ve been easier if I’d done it on my workbench at home. As it was I worked on this backstage, in the dark, with one flight case as a workbench and another as my chair, on my days off in Las Vegas while Lionel had a residency there over September/October.
It’s certainly the most difficult build I’ve ever attempted. The component density is pretty high compared to what I’m used to, and I guess I’m out of practice for using organic flux solder, but the solder didn’t seem to flow very well across the board or through the holes.
That said, when I got home and fired it up, 2 of the 3 oscillators came up pretty much correctly, as did the driver section. The non-working oscillator was due to multiple cold solder joints.
The layers of documentation - JH’s original drawings and notes, added to by the additional schematics and parts list by RS, which have different component designators than JH’s original docs - made it particularly confusing when putting together the parts order, and infuriatingly difficult to troubleshoot.
In fact, I’ve still got a retrace problem that I’ve yet to be able to suss out: the waveforms all draw correctly, but have strange ringing or notches at the tops and bottoms of the waveforms that change with the position of the Pulse Width pots. It’s the same symptom on all three oscillators. Ideas?
e
On Jan 8, 2017, at 7:18 PM, William Hall <
wjhall@...> wrote:
Eric - All -
We took a look at the Randomsource Living VCO PCB - it has some clever features that our panel doesn't reflect (having only glanced at Randomsource at first, we didn't see the VCA/distortion/overdrive feature). Let us review it and see - I think a modest modification to our design will easily accommodate the full feature-set. Gotta say - Randomsource sure has done a nice job. The Eurorack add-on is a clever addition, but, of course, it does we 5U-ers no good. How was the build? Easy enough?
Bill and Will