Search found 1130 matches

by Mungo
Sat May 23, 2020 8:41 pm
Forum: Eurorack Modules
Topic: Doepfer case question
Replies: 2
Views: 67

Re: Doepfer case question

Doepfer are very good at keeping up information about their products:
http://www.doepfer.de/a100z_e.htm
There are pictures of the two different supplies there to compare against.
by Mungo
Sat May 16, 2020 5:18 pm
Forum: Eurorack Modules
Topic: 4ms Row Power Nightmare (and ALM Pip Slope) PLEASE HELP
Replies: 12
Views: 396

Re: 4ms Row Power Nightmare (and ALM Pip Slope) PLEASE HELP

OK it turns out that the cable was the issue. These are shielded cables from Polarnoise which are designed for Eurorack but are obviously rubbish. I thought it would be good to have shielded cables as I needed some 1.5 metre ones. When I use tiptop stackable etc it’s fine. However the pip slope sti...
by Mungo
Fri May 15, 2020 9:01 pm
Forum: Eurorack Modules
Topic: 4ms Row Power Nightmare (and ALM Pip Slope) PLEASE HELP
Replies: 12
Views: 396

Re: 4ms Row Power Nightmare (and ALM Pip Slope)

Please see below for this video I sent to ALM which covers the issues: Like you said in the video, there are many combinations of different things and where the problem is becomes confusing to find. The answer is you probably have multiple different problem with the setup that make it hard to focus...
by Mungo
Tue May 05, 2020 6:30 pm
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 482

Re: The horror of "PCB pattern is 1/4 normal size"

I can't think of any easy way the home constructor could scale up artwork. Photocopiers at that time could not enlarge or reduce. I guess it depends on the specific dates, enlarging/shrinking was routinely available on photocopiers in the 80's. Don't know if there is a good history/museum of photoc...
by Mungo
Mon May 04, 2020 7:05 pm
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 482

Re: The horror of "PCB pattern is 1/4 normal size"

Photocopier direct to transparencies
by Mungo
Sun May 03, 2020 5:58 am
Forum: Music Tech DIY
Topic: Feedback on case power entry advice
Replies: 22
Views: 511

Re: Feedback on case power entry advice

We dont in Spain, but i have a lot of power strips, so maybe what i can do i just plug the psu of the cases (its 3 cases in total) directly to a power strip and just turn it on / off with its switch. Powering multiple cases from a single brick with the normal barrel plug/socket has caused many peop...
by Mungo
Sun May 03, 2020 5:55 am
Forum: Music Tech DIY
Topic: Feedback on case power entry advice
Replies: 22
Views: 511

Re: Feedback on case power entry advice

You should turn off at the mains. by "the mains" do you mean placing the switch just after the secondary from the transformer? i have done this in my MFOS wall-wart psu project. that should leave the psu with a load at turnoff (plus it's got a couple of resistors on the output as dummy loads). curi...
by Mungo
Fri Apr 24, 2020 1:17 am
Forum: Eurorack Modules
Topic: Ongoing cable/output frustrations
Replies: 29
Views: 830

Re: Output cables driving me crazy

Thanks for that explanation. It’s probably what I needed to hear. I do have an old two channel tube di box I can try. But I don’t want to overthink all of this and create a problem where there wasn’t one before either. Going directly into my mixer with unbalanced cables, while certainly not ideal, ...
by Mungo
Thu Apr 23, 2020 6:46 pm
Forum: Eurorack Modules
Topic: Ongoing cable/output frustrations
Replies: 29
Views: 830

Re: Output cables driving me crazy

Ha, so it sounds like most of you are using a mish mosh of cables and adapters just like me. At least I’m not missing out on some holy grail of a solution. There isn't a single "grail" as everyone has different requirements, and the eurorack market is so small there aren't any mass produced (cheap)...
by Mungo
Mon Apr 20, 2020 6:28 pm
Forum: Eurorack Modules
Topic: Non-grid-based, Phase-locked modules
Replies: 32
Views: 1072

Re: Non-grid-based, Phase-locked modules

CV recorders capable of phase-lock. The s0 does exactly that, its show in the last 30 seconds of the demo here: https://youtu.be/JJnh7FZ5QW4 Both high timing resolution, and automatic phase locked looping. Its more accurate with loaded sequences but is fully DC coupled so it can record CV on the fly.
by Mungo
Mon Apr 13, 2020 12:35 am
Forum: Eurorack Modules
Topic: Mungo Enterprises c1, convolution, delay, sampler
Replies: 42
Views: 3099

Re: Mungo Enterprises c1, convolution, delay, sampler

Added some examples on the website:
http://mungo.com.au/c1.html
Showing the continuous range of different sounds the length of the live convolution kernel has, and using the same length control to adjust the cutoff of a boxcar filter.
by Mungo
Sun Apr 12, 2020 4:46 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

If an external power supply provides a mains Earth it has to be on a separate wire and you don't get one on a DC jack therefore... If an external power supply does have a DC jack, it should (probably) not be connected to mains earth No, therefore... you shouldn't be thinking in terms of DC jacks an...
by Mungo
Sat Apr 11, 2020 5:18 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

All the cases have the same problems, 0V connected back to mains earth along cable(s) that are also carrying power return from the brick. The problem is only that the common between each psu (internal and external) is derived through high current carrying wires, NOT that it is connected to mains Ea...
by Mungo
Fri Apr 10, 2020 7:30 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

At this point, I'm leaning towards getting rid of the Pods and replacing them with a 6U 150hp that'd match my primary rack. That will still leave the problems hiding in the larger case, best to fix it too so it doesn't get in the way of musical adventures in the future. I think I'm not sure what th...
by Mungo
Fri Apr 10, 2020 5:08 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

Daisy chaining power with barrel connectors is about the worst thing you can do for this That's interesting, considering 4ms designed them to be daisy chained... =\ DC Barrel power connections just don't work well for larger power systems. So, even though the pods themselves are small.. using the p...
by Mungo
Fri Apr 10, 2020 8:41 am
Forum: Music Tech DIY
Topic: Where to use TLE2074 instead of TL074
Replies: 6
Views: 264

Re: Where to use TLE2074 instead of TL074

For most purposes the next step up from a TL07x/TL05x is an OPA1678/1679. Far more modern and few compromises.
by Mungo
Fri Apr 10, 2020 5:19 am
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

With nothing patched, testing between any pod and anywhere in my main case yields values between 50-100 mV (negative probe always on a pod). The farther from the pod's power source I test, the lower the reading is. For example, with the SWN in the 3rd pod in the chain, values are in the 50s. If I s...
by Mungo
Fri Apr 10, 2020 5:12 am
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

Good detective work so far. The order the pods are chained in seems to matter. ..and there we have one of the important pieces of information! Daisy chaining power with barrel connectors is about the worst thing you can do for this as they share the 0V and power return in the same skinny conductor. ...
by Mungo
Thu Apr 09, 2020 6:37 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

What you are looking for is a jump in the 0V value greater than 20mV which would explain the pitch shift you had. So, let's say I find a connection that has that jump. What then? If the shared ground wouldn't necessarily resolve it ... would it just be down to moving modules between cases to attemp...
by Mungo
Thu Apr 09, 2020 4:37 pm
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

Try to measure the DC voltage between the "0V" of different modules within the large case (the nuts on metal 3.5mm sockets are conveniently accessible). Your 30 cents of pitch error is a 25mV offset/error and before adding patch cables the DC offsets between modules may be even higher. I chose modu...
by Mungo
Thu Apr 09, 2020 2:49 am
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

Do you have a multimeter? Turn on the main case and without anything plugged into it measure the DC voltage between the metal nuts of the 3.5mm sockets on different modules around the case (or plug in a dummy cable and measure from the sleeve of the free hanging plug). Thank you for the response! I...
by Mungo
Thu Apr 09, 2020 12:08 am
Forum: Eurorack Modules
Topic: Power: interconnecting 4ms Pods with my main rack & pitched signal loss
Replies: 29
Views: 715

Re: Power: interconnecting 4ms Pods with my main rack & pitched signal loss

Floating supplies can make it easier to eliminate interconnection problems, but that it happens with multiple different external cases regardless of mains earthing or not points to the main case being problematic. Do you have a multimeter? Turn on the main case and without anything plugged into it m...
by Mungo
Mon Apr 06, 2020 8:57 pm
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 176
Views: 6068

Re: rhythm wolf teardown: any questions?

There is a generally accepted transient/attack period during which pitch is indeterminate, atop the complicating non-linearity of the envelope modulation. Looking at the C-E vs C-B current flows there is a reverse beta measurable. I think the methods of calculating instantaneous pitch are possibly l...
by Mungo
Mon Apr 06, 2020 1:12 am
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 176
Views: 6068

Re: rhythm wolf teardown: any questions?

so, the first part makes sense (Vcomm going a diode drop below), but Q43 base gets pulled low (in my replica circuit), not lifted up as a result, and the current in the collector does increase, but it neither flows "into", nor is it due to transistor action as the wording implies. I double checked ...
by Mungo
Sun Apr 05, 2020 11:39 pm
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 176
Views: 6068

Re: rhythm wolf teardown: any questions?

I'm not convinced C-E reverse conduction of Q43 is the dominant process, also there is no voltage modulation visible on the collector of Q42 wrt ground in the physical circuit. It is there in SPICE simulation (that paper only confirms its accuracy against SPICE) but not apparent in a real circuit. T...

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