Search found 2148 matches

by cackland
Thu Aug 27, 2020 5:44 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

200mA draw on the positive rail does seem like a fair bit so I think it is worth a bit of exploration to see if that is a natural consequence of sensible design, a consequence of a slightly flawed design, or a result of a problem with the build itself. Thanks cygmu. It could be a result of all. 70m...
by cackland
Wed Aug 26, 2020 8:37 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

The processor uses at most 70mA at 72MHz so that doesn't explain the 200mA you see. Even with 70mA current consumption you should consider using a switching voltage regulator for improved efficiency and less current from the +12V supply. Do you need to run it at max frequency or can the application...
by cackland
Wed Aug 26, 2020 8:34 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

An alternative to diodes are MOSFETs, which will have a lower voltage drop if you really need to squeeze the last few 100mV or so out of the rails. Neil Yes, you must of missed this mentioned above: I've seen some circuits with these mosfet diodes in place of the 1N5819. https://au.mouser.com/Produ...
by cackland
Tue Aug 25, 2020 9:45 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

I was also thinking about implementing an inline current rail test point, using a 2.54 2 pin header.

Is it as straight forward as this? (With jumpers when not testing)
Screen Shot 2020-08-26 at 12.44.56 pm.png
by cackland
Tue Aug 25, 2020 9:40 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

You have all the information you need. Presumably the input voltage (the line going off the page to the left) is 12V. The 1N5819 is a Schottky diode, so it will reduce the voltage by about 0.3V - you measure 11.6V between the diode and the resistor, so that's about right. You say that the voltage o...
by cackland
Tue Aug 25, 2020 9:38 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

KSS wrote:
Tue Aug 25, 2020 6:19 pm
Along the lines of what neil brought up.
Is the PSU a half wave wall wart typev supply? Those don't handle uneven rail draw very well.
The power supply is a mean well GSM90A15-P1M.. The same as Intellijel provides with their 7U case.
by cackland
Tue Aug 25, 2020 9:37 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

How does the negative rail look? Are you seeing the same voltage drop across R43? Whatever your circuit is doing it is pulling around 200mA from the positive rail = 2.4W. Toasty. Are there any digital bits that are being driven off a local 5V regulator? Perhaps a 7805? Yes, there is a digital secti...
by cackland
Tue Aug 25, 2020 9:17 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

Is your main power supply still providing 12V? It doesn't matter where you measure it, the voltage on the module power rail should be constant (within a few millivolts) Interesting.. I'm measuring 11.6V in between the 1N5819 diode and the 10 ohm resistor. So much more than a few millivolts from the...
by cackland
Tue Aug 25, 2020 9:15 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

If your modules are drawing 200mA then the 10R will drop 2V. That seems plausible to me. What are you powering from this? It’s a multi channel VCA processor module. Haven’t tested the current module draw at the moment... Back to the idea of headroom. If the module is drawing a certain amount of cur...
by cackland
Tue Aug 25, 2020 6:38 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

KSS wrote:
Tue Aug 25, 2020 3:30 am
check the batteries in your meter.
Good call... however multimeter has new batteries. Other voltages measured in the circuit are correct.
by cackland
Tue Aug 25, 2020 6:38 am
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Re: Power Rails voltage drop

Is your main power supply still providing 12V? It doesn't matter where you measure it, the voltage on the module power rail should be constant (within a few millivolts) Interesting.. I'm measuring 11.6V in between the 1N5819 diode and the 10 ohm resistor. So much more than a few millivolts from the...
by cackland
Mon Aug 24, 2020 10:01 pm
Forum: Music Tech DIY
Topic: Power Rails voltage drop
Replies: 31
Views: 528

Power Rails voltage drop

I've just checked the voltage coming from the rails throughout various stages of my circuit and noticed a significant difference from the expected +-12V rails. So I hooked up my multimeter to the power entry point in my module and noticed the same voltage straight off the rails. Screen Shot 2020-08-...
by cackland
Sat Aug 22, 2020 9:34 am
Forum: Eurorack Modules
Topic: Basic FPD file for Mutable Instruments Elements?
Replies: 9
Views: 219

Re: Basic FPD file for Mutable Instruments Elements?

Brian if you need I can make a quick video
by cackland
Sat Aug 22, 2020 9:27 am
Forum: Eurorack Modules
Topic: Basic FPD file for Mutable Instruments Elements?
Replies: 9
Views: 219

Re: Basic FPD file for Mutable Instruments Elements?

Illustrator -> FPD Process: Illustrator: Export dimension / holes to a .dxf file FPD: File > Import > Select .dxf file > Select Options Note: this is the first stage. Basically sets up a blank front panel with the holes and dimension of the panel. Next step is adding the graphics and aligning that t...
by cackland
Thu Aug 20, 2020 7:00 pm
Forum: Eurorack Modules
Topic: SQUEEZE 4HP compressor by FEEDBACK [NEW module]
Replies: 35
Views: 2037

Re: SQUEEZE 4HP compressor by FEEDBACK [NEW module]

Ordered 6 of the Squeeze's in early July, waiting patiently for my "6 channel drum compression"...these are surely times that require patience with international shipping! Yo, that's nuts, but I'm not gonna lie, honestly its a good idea, especially when you save on shipping. That's probably the onl...
by cackland
Wed Aug 19, 2020 11:38 pm
Forum: Eurorack Modules
Topic: Stereo Mixers
Replies: 25
Views: 781

Re: Stereo Mixers

They all come with various features, some standard.. some not so standard. Do you have any specific requirements for a mixer?
by cackland
Tue Aug 18, 2020 10:32 pm
Forum: Eurorack Modules
Topic: Custom MIXER MADNESS!!!
Replies: 48
Views: 3907

Re: Custom MIXER MADNESS!!!

Noice :)

What linear potentiometers are you using?
by cackland
Tue Aug 18, 2020 8:10 pm
Forum: Eurorack Modules
Topic: Rabid Elephant NATURAL GATE
Replies: 1175
Views: 103180

Re: New Module: Rabid Elephant NATURAL GATE

To buy or not to buy... that is the question (for me at least) ;)
by cackland
Tue Aug 18, 2020 3:50 pm
Forum: Eurorack Modules
Topic: FX AID - multi audio effect module
Replies: 1443
Views: 109476

Re: FX AID - multi audio effect module

Igor, can you provide the front panel file /files for the XL version? Would like to design a custom panel.
by cackland
Thu Aug 13, 2020 6:34 am
Forum: Eurorack Modules
Topic: How did you pick your sequencer?
Replies: 90
Views: 2286

Re: How did you pick your sequencer?

I picked it based on the length of the sequence I could create and its melodic capability.

ER101.
by cackland
Thu Aug 13, 2020 5:58 am
Forum: Music Tech DIY
Topic: SMT assembly houses with good prices and non-green solder mask
Replies: 49
Views: 1071

Re: SMT assembly houses with good prices and non-green solder mask

I also had a bad experience with SEED. +1 for PCBway. Really good service, communication, QC,etc. Out of all of the places, they have some of the more advanced board manufacturing options (Hybrid Flexboards? Yes!) The very few problems ive had with them (and that can happen anywhere), they were cor...
by cackland
Thu Aug 13, 2020 3:56 am
Forum: Music Tech DIY
Topic: Panel Visual Design
Replies: 21
Views: 569

Re: Panel Visual Design

Sorry I meant the actual finished panel. All the 4U panels here were made at Schaeffer AG in Germany. PDF print on alu: https://www.flickr.com/photos/batchas/albums/72157664104600025 I'll make a HD photo of the last panel I did in Eurorack format asap. It's pretty much what you see in Eurorack form...
by cackland
Wed Aug 12, 2020 7:39 pm
Forum: Eurorack Modules
Topic: FX AID - multi audio effect module
Replies: 1443
Views: 109476

Re: FX AID - multi audio effect module

Benoist wrote:
Wed Aug 12, 2020 12:38 pm
The Cwejman is strong with this one ! :hihi:
I 'am glad I didn't rush, I'am in for the XL if in the meantime the XXL with screen and all you can load FX is not released :mrgreen:
I pushed hard enough.. ;) for this updated version.
by cackland
Wed Aug 12, 2020 6:07 pm
Forum: Music Tech DIY
Topic: SMT assembly houses with good prices and non-green solder mask
Replies: 49
Views: 1071

Re: SMT assembly houses with good prices and non-green solder mask

I'd also love to see an answer to this but my gut says there won't really be anything that competes with JLCPCB or similar they are so cheap because they don't do anything custom. Even on JLCPCB, if you do custom colors you can get into price hikes pretty fast. Pretty sure with JLCPCB that non-gree...
by cackland
Wed Aug 12, 2020 5:39 pm
Forum: Eurorack Modules
Topic: Supercell: expanded version of Clouds + Superparasites firmware
Replies: 575
Views: 59856

Re: Grayscale shits on Mutable’s open source license

God I hope someone forked the Grayscale source files on Github and releases everything... Some people <cough> may have copies. But Typhoon is better tbh Yes, I’ve previously stated that I have the files. From my understanding, as soon as those files were released onto a public domain like github un...

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