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by Graham Hinton
Sun Aug 23, 2020 6:48 am
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

Kent wrote:
Sun Aug 23, 2020 3:28 am
Graham has always been prickly. He chooses to portray himself that way.
No, YOU choose to portray me that way. So fuck you. No more advice for anyone, I've had it with cowards hiding behind avatars who think they can say things online they wouldn't dare say to my face.
by Graham Hinton
Sat Aug 22, 2020 2:04 pm
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

I’m not a moderator on these forums, so perhaps it’s out of line for me to say this, and if so, I apologize to the moderators and will understand if you delete this post. If you have a valid complaint take it to the moderators. You just ruined your own thread with a political correctness lecture. C...
by Graham Hinton
Sat Aug 22, 2020 10:47 am
Forum: Music Tech DIY
Topic: CV Voltage Limiter
Replies: 4
Views: 288

Re: CV Voltage Limiter

My initial thought is to have it limited to +/- 10V, since I'll probably mostly it as a CV source, but it would is dose generate sound and I don't want to distort/limit that too much below modular levels. All modules are limited to about that signal swing anyway, approximately 2.5V below the power ...
by Graham Hinton
Sat Aug 22, 2020 8:26 am
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

I'd like to see some enterprising company sell a 2hp panel with a binding post connected to the 6 ground pins on a power connector. That is a silly idea, you have just introduced two pcbs and two ribbon cables into the link. It isn't even bad engineering because you haven't calculated the resistanc...
by Graham Hinton
Fri Aug 21, 2020 3:41 pm
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

Since I get some improvement with a banana lead, how much better would two stacked leads be? Theoretically double or 6dB reduction, but practically the jack will be a bottleneck as you would stack the plugs and still have the contact resistance of one jack in line, rather than two jacks. Just try i...
by Graham Hinton
Fri Aug 21, 2020 2:26 pm
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

I do this all the time, too. I always install a black banana jack on each Eurorack case, wiring it with 18 gauge wire to the common terminal (ground) of the internal power supply. When patching between cases, I use a Pomona banana patch cord to connect all the commons. This way I'm hoping to avoid ...
by Graham Hinton
Fri Aug 21, 2020 12:06 pm
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

Could just be a difference in terminology between UK and US. I was using US terminology for your benefit :) A jack is a socket of whatever type. In the UK we refer to jack plugs and jack sockets (which makes as much sense as "comprises of"). Measuring between jacks, I'm getting readings of 0.1 or 0...
by Graham Hinton
Fri Aug 21, 2020 11:22 am
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

Would I just be touching one probe to a ground blade on one busboard and the other to the ground blade on another busboard? I just answered that above--measure between jacks or cables in plastic jacks. Measuring between busboards does not include the voltage drops through ribbon cables and modules ...
by Graham Hinton
Fri Aug 21, 2020 10:58 am
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

A little bit of noise wouldn't bother me. In fact, I kinda like it. Old analog synths can be pretty noisy too actually. Tuning issues would be a problem though, and that was my main concern. There is a difference between the old analogue mains hum and wideband noise and the digital noise you get no...
by Graham Hinton
Fri Aug 21, 2020 6:56 am
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

I've noticed a slight but audible delay in gate timings when using a multed clock source to drive two gate sequencers, each in a separate case. There are many variables, no doubt. I am curious about how multiple power supplies for multiple cases factors into something like this. A better version of...
by Graham Hinton
Thu Aug 20, 2020 7:34 pm
Forum: Eurorack Modules
Topic: Patching Between Cases
Replies: 71
Views: 1770

Re: Patching Between Cases

Are there any issues to watch out for when doing something like that? Unbalanced systems have to have a common reference which means that all the 0Vs have to be joined. If you don't do it explicitly then an inferior one will become established through whatever paths exist through cable screens and ...
by Graham Hinton
Thu Aug 20, 2020 8:51 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 451

Re: Hcc15-3-ag power supply odd behavior

I have yet to connect any of their commons, but it all sounds real good, less crosstalk than before and just clearer. Good. You need to establish a good common though. it was sounding great and then a sound crept in like wind blowing on a microphone over it and stayed That is usually the sign that ...
by Graham Hinton
Tue Aug 18, 2020 1:06 pm
Forum: Music Tech DIY
Topic: Modular popup mixer power cable management help
Replies: 4
Views: 193

Re: Modular popup mixer power cable management help

I'm really a bit lost and wondering if anyone has already solved the problem! Most of the music industry apart from the modular synth niche. Pop-up cases have a 19" rack frame so put a proper enclosed 19" sub frame in it. Then you get sides and a back to attach all the loose wires and pcbs to. Here...
by Graham Hinton
Mon Aug 17, 2020 6:36 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 451

Re: Hcc15-3-ag power supply odd behavior

Habit I picked up from cgs builds, never thought it would come back to bite me. I've always wondered why people do that and don't work out the time constant. I definitely wish I had made the cabs mirror image and joined thru the sides with a bar - just didn't think it thru. If the cases are going t...
by Graham Hinton
Mon Aug 17, 2020 1:59 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 451

Re: Hcc15-3-ag power supply odd behavior

If I am using the cases together, which I imagine will be most always, would I then earth only in one side or the other? It would be easy enough to do both if preferable. Earth both, like I just said. Don't say that will make a ground loop. It won't if you follow what I said. I've fitted a 4 pin XL...
by Graham Hinton
Mon Aug 17, 2020 6:33 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 451

Re: Hcc15-3-ag power supply odd behavior

Could my former chain of busboards have created a pillowtype buffer of resistance to this before? Not enough to stop this. I looked at NTC thermistor info and that seems to be what they would be doing, not sure how to calculate what type I would want, or if it would even be helpful. The correct pla...
by Graham Hinton
Mon Aug 17, 2020 6:11 am
Forum: Eurorack Modules
Topic: Doepfer LC9 grounding "problem"
Replies: 21
Views: 864

Re: Doepfer LC9 grounding "problem"

based on what you're saying there Graham, there's nothing wrong with my system - but something is wrong with the wiring at home? I don't know how you have construed that when I just said the exact opposite. The reason that you feel the tingling is that the induced charges are finding a path to Eart...
by Graham Hinton
Sun Aug 16, 2020 4:58 pm
Forum: Eurorack Modules
Topic: Help me troubleshoot weird power issues
Replies: 15
Views: 329

Re: Help me troubleshoot weird power issues

But I don't know what next steps to take. Test each regulator separately: Do the LEDS come on? Check the output voltages and if approximately right trim to exactly 12.00Vdc. Try with one module, does it work? Try with a full load, does it still work? The output voltage will have changed by a few mV...
by Graham Hinton
Sun Aug 16, 2020 1:12 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 451

Re: Hcc15-3-ag power supply odd behavior

One thing is the inlet is at the bottom and the supply at the top. I used 18 awg because I had it, not thinking it mattered. It's almost three feet long. Should I fatten this up to 14? It doesn't matter. A tiny voltage drop on mains at mA is not going to effect anything. I also didn't use those sta...
by Graham Hinton
Sun Aug 16, 2020 12:57 pm
Forum: Music Tech DIY
Topic: Struggling with gate i/o buffers for arduino
Replies: 6
Views: 152

Re: Struggling with gate i/o buffers for arduino

Hey, trying to create cuircuit for 8gate inputs and 8 gate outputs for an arduino, im using a spi io expander followed by two MC74HC541A buffers/line drivers/receivers, sounds reasonable? No. The '541 is a digital bus driver, not an analogue one. You are powering it from 3.3V so you won't get a 5V ...
by Graham Hinton
Sun Aug 16, 2020 9:09 am
Forum: Eurorack Modules
Topic: Help me troubleshoot weird power issues
Replies: 15
Views: 329

Re: Help me troubleshoot weird power issues

The current power supply is a toroidal centre-tapped 12VAC transformer, 80W. Wrong transformer. This has 2x 12Vac secondaries and it is 80VA not 80W. VA is the product of the maximum voltage and maximum current that the transformer can take which do not necessarily occur at the same time or in phas...
by Graham Hinton
Sun Aug 16, 2020 8:03 am
Forum: Eurorack Modules
Topic: Doepfer LC9 grounding "problem"
Replies: 21
Views: 864

Re: Doepfer LC9 grounding "problem"

Is there anything i am supposed try , besides emailing Dieter? Connect your 0V on the distribution to mains Earth via a wireable mains plug. If that doesn't make sense to you, get qualified help. I'm really confused on how i can use the system for 2 months and not experience anything - then suddent...
by Graham Hinton
Sat Aug 15, 2020 2:34 pm
Forum: Eurorack Modules
Topic: Help me troubleshoot weird power issues
Replies: 15
Views: 329

Re: Help me troubleshoot weird power issues

Also, just to help me understand: the idea is to load both the +12 and -12 sides of the boards to see what happens to the boards, I get that. Don't waste your time, this isn't going to tell you what you need to know. Firstly, what sort of transformer do you have? You haven't given any more informat...
by Graham Hinton
Thu Aug 13, 2020 9:22 am
Forum: Music Tech DIY
Topic: Panel Visual Design
Replies: 21
Views: 570

Re: Panel Visual Design

Is it just a case of measuring the panel and putting those measurements into illustrator as a starting point? No. If you do that you will introduce manufacturing errors before you have your own manufacturing errors. The safest way is to recreate the process that the original designer did. Most desi...
by Graham Hinton
Wed Aug 12, 2020 6:28 pm
Forum: Music Tech DIY
Topic: Questions on the Prophet 5
Replies: 30
Views: 943

Re: Questions on the Prophet 5

As the 2732 had access times between 200ns and 400ns if you are only replacing it and have a device that is <200ns you won't have any problem. I'm sorry that seems to contradict your previous explanation. Isn't that what I'm trying to do? Replacing a 450ns device with a 150ns device with some adjus...

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