Cold Mac Ideas

[bloc]

Does anybody have a idea how i can create a trigger or pulse once a voltage is on 0 volt?

[desolationjones]

Back of the napkin attempt as I am sadly parted from my Cold Mac:

Unipolar signal into SURVEY for tiny negative offset (aka gate threshold), CREASE OUT into OR IN 1, dummy cable into OR IN 2. Should get a gate-ish output from OR OUT.

Don’t know how to accomplish this with bipolar input…

[bloc]

Thx Didn’t think of putting the signal in the survey for this purpose

[rycolos]

Does anyone else find that the Slope out doesn’t always work that great? I swear I’ve been able to get octave up sounds out of it in the past but I can’t seem to get anything from it now without cranking my levels. Every VCO I patch into it ends up super quiet. It seems to be working a bit better with CV. Follow is still working the same.

[smbols]

Rectifying a signal does drop the level since the negatives get turned into positives and essentially reduce the overall amplitude by half if the incoming signal is symmetrically bipolar. But it could also be the waveforms you’re sending it. If you send it a square you won’t really get much of anything back out. If you send it a saw it’s going to convert it into a triangle, which can make it sound even quieter than with just the amplitude drop alone.

[rycolos]

You ever ask a question based on a problem you’ve been trying to solve for hours, only to immediately realize the answer after asking? I was sending the Cold Mac output to a DIY mixer with some additional half wave rectification…thus killing my signal entirely.

[claasp]

i recently got a second cold mac and noticed that the white noise/feedback patch mentioned many times above

“crease out > offset in
left out > crease in
right out > audio out”

and variations of it, barely produces anything audible.

has anyone experienced this before?

also there’s an extra populated/printed pcb that i haven’t seen before, or at least my other cold mac doesn’t have this extra pcb.

could this be the reason for the heavy attenuation?

also to note, everything else seems to be functioning normally

[coreyr]

That is definitely the newer revision of CM.

The white noise patch is very sensitive to survey knob position on my older mac, ranging from almost no sound, quiet noise, rf tuning sounds, sporadic dust crackling. The windows where these sounds occur are some times narrow and difficult to find.

[claasp]

hmm, i am familiar with the sensitivity as i’ve had my first cold mac for a while now. yet this newer version is producing no sound when slowly sweeping the survey knob. you can faintly hear some intermittency but it’s so attenuated that it’s registering somewhere in the -30db -50db range.

[Justmat]

Started off as

@claasp

“crease out > offset in
left out > crease in
right out > audio out”

Add in a bit of sisters, and hello saxophone!?

[coreyr]

Love it, saxophone but with a touch of this speech robot:

[andrew]

i can’t watch more than 30 seconds of this bc of how funny it is

thank you

[synthetivv]

Keep watching. Don’t miss the duet.

[andrew]

TOOO oOOO

FUNNNNYYYyYY

[dianus]

I just received a brand new Cold Mac from CTRL-MOD and cannot figure out if the behaviour it’s demonstrating is normal. I studied the documentation pretty closely. I’ve attached a few scope shots. I’d expect, since survey is normalled to (left, right, or, and etc) that turning the knob would have a fade, rectification, wave-slicing effect. But the output of the individual channels don’t really seem to respond. I am sending it a sinewave from MMF filter. Something I am missing here?

[renegog]

When you plug into the inputs it breaks the normalization. If you were to plug the sine into survey, you would get different versions of it out of the different outputs, but putting the sign into the crease input (for example) will make survey have no effect on the crease output. Because of the normalization to fade you should see an effect of survey when you have stuff into left/right (it should crossfade)… is that not happening? I can’t totally tell what’s going on on your scope there. It might be better displayed by having only one input because that input should fade to zero at one extreme like a VCA. Oh also the Or/And circuits, survey should move the threshold so the flattened part of the sine should shift up and down — so that does look problematic.

[dianus]

I thought if you plugged an audio signal, say into left in, the control of the fade was normalled to the 5v/-5v survey knob? In the pictures where there are two inputs the bottom one is a dummy cable like suggested in the Patching Cold Mac document. So I believe with, audio -> left input (no CV input into FADE) -> the sweep of the survey should attenuate the output on left out no? In the case of my Cold Mac, audio plugged into Left, Right, Crease, etc. with no cv input, sweeping the Suvey knob as no effect.

[renegog]

Didn’t realize it was a dummy cable that makes sense—yes you are right. Seems like the knob isn’t responding. Def send the left/right and and/or pics to ctrl-mod, the crease ones threw me off at first though because that seemed normal I really look forward to your cold mac ideas once you get a working one ^___^

[dianus]

UGH oh no I thought it was just me not reading the manual close enough. Thanks for the sanity check!

[renegog]

easy dummy check as well is how it responds as an attenuator. audio in anywhere on the left side, listen to mac out and does the knob attenuate? if it’s working there that would be much weirder and I must be losing my mind as well…