As much as I’d love to send you some bus boards, try the extra ground wires first! It’s an easy fix, and it was quite a workable solution for me.
PS. I agree FC makes very nice modules otherwise. I’m guessing they’re trying to get through their current stock before acknowledging the problem.
Almost exactly two years after @TimMJN suggested the ground wire fix for the Routemaster I finally implemented it. Lo and behold I have three decent sounding oscillators now!
I’m still a little miffed at FC about the whole situation - but I guess the analog systems we use are just inherently more sensitive to such things?
Anyway - I am now upgrading my top case with some much needed fuse protection as well as metal rails. Looking forward to being able to shuffle my modules around and stop having to break out the drill every time I want to move something.
A while back Jeremy from Red Means Recording got a really rad new case. When he was walking through it he mentioned having a shuttle - basically just an internally patched extension cord. I thought “Well that’s neat”.
Skip forward to last night when woke up and thought “Wait. Why don’t I have that?!”
After a little more thought about a shuttle design, it might go something like this: Two 5CM modules with five jacks each go on the far opposite ends of the case. Hookup wire runs behind all of the modules inside the case to a single 10CM module in the center that has two columns of five jacks, one for each of the smaller side modules.
This whole setup is then duplicated for the bottom case and a 10 pin ribbon cable connects the top and bottom 10CM modules to each other through holes in the back of the case. This way I can have one wire that easily connects the top and bottom cases together with the standard box headers on some stripboard.
Just a thought and easy enough to implement. I suppose I’m trading off module space for cable management. Might still be worth it since I do seem to use my attenuator module just to jump across the case an awful lot.
Looks related to:
Specifically, they look like Quickon terminal blocks.
Spicy spaghetti. The blue ones might be mild…
Terminal blocks! That was the term I was looking for.
I just inherited this project and have to quickly make sense of it all before the end of the month.
Lego for 'Lectrics?
I have a couple of cheap behringer normalized (but switchable) patch-bays that come in very handy with most of my external fx and my audio interface. Very easy to make too should you go down that route.
Finished up with the big project at work - I was in charge of tech for a new escape room that we are making. I’m pretty proud of the results and I can for sure say thank you to these forums for having to courage to even attempt it… soooo… thanks ya’ll!
Now, hopefully, I’ll have some time to actually go back to working on my synth.
Progress!
The most recent change is moving the power supplies from the bottom of the lower case to the back wall. I dropped a screw directly onto one while the power was off and realized that there might be a problem there.
I am finally at the point now where I can start putting modules back in. It will likely be a pretty slow process as I’ll be combing over each module to troubleshoot, upgrade, and clean as I go.
Odd behavior on my 1222 VCO - the square wave seems to work until the module “warms up” a bit - then it mysteriously drops off and disappears. The saw and triangle seem perfectly fine. I’ll take it out and give it another look over and a clean - but I don’t suppose this sounds like something anyone has heard of before?
Sounds like something is shorting between your output jack and the opamp. As it’s just happening it may well be mechanical.
So, I suggest building a completely new 1222 VCO as a mirror for testing, which as we all know will be perfect because we never suffer the ignomony and shame of the odd-dry-joint. Do we folks??
Time to go with the re-flow!
I’m not familiar with the 1222, but it sounds like it could be an issue with a transistor element in the circuit. When the module heats up it will change the response of the transistors slightly. If they were operating in a small window of voltage they could drift out of that range. The first place I would look is the the part of the circuit that’s converting the square wave from whatever the original waveform is (if that’s how it’s generated).
The conversation happens inside the 3340 chip. Is the pulse wave present on the 3340 pin?
I have a ramp and a triangle coming out of the 3340, but there is no pulse coming out of pin 4
A little cleaning and reflowing… and I think I had the extra 1m resistor between pins 3 and 4 instead of 4 and 5. Whoops. Anyway, it seems to be working now!
I hope you meant a 1M resistor.
