Search found 255 matches

by ixtern
Thu Feb 25, 2021 3:26 pm
Forum: Music Tech DIY
Topic: Heads up: Mouser is fairly f'd right now
Replies: 28
Views: 1070

Re: Heads up: Mouser is fairly f'd right now

Mouser: My order from 9 Feb was sent 12th and delivered to Poland 18th (some delay at the Paris airport). Knowing the problems there I am not complaining about time and even that Mouser has forgotten to include 100 transistors in this package (although marked them in order as "shipped"). In such tim...
by ixtern
Wed Feb 10, 2021 1:01 am
Forum: Music Tech DIY
Topic: Huge Eurorack Case Power Options
Replies: 56
Views: 798

Re: Huge Eurorack Case Power Options

I am going other ("distributed") way supplying my racks. Currently I have three 84HP racks (full metal) occupied and next on the way. Every 84HP rack has it's own linear DC voltage regulators (up to +12V/1.5A and -12V/1A although due to heat produced I don't intend to excess 1A in continuous work) a...
by ixtern
Tue Feb 02, 2021 1:49 am
Forum: Music Tech DIY
Topic: Question about DACs accuracy
Replies: 18
Views: 522

Re: Question about DACs accuracy

Double post...
by ixtern
Tue Feb 02, 2021 1:45 am
Forum: Music Tech DIY
Topic: Question about DACs accuracy
Replies: 18
Views: 522

Re: Question about DACs accuracy

MCP4922? You've got what you pay for. Cheap DAC - poor linearity DAC (usually). I've tested about 10 pcs of MCP4822 from two sources (essentially the same DAC as in MCP4922) and only 1 has good enough linearity (I am not talking about DAC's resolution but about DAC's linearity). That's why calibrati...
by ixtern
Mon Feb 01, 2021 5:41 pm
Forum: Music Tech DIY
Topic: What programming platform to build a sequencer?
Replies: 28
Views: 977

Re: What programming platform to build a sequencer?

I would say that Arduino is for simple sequencer projects only. It is too slow if you want good timing resolution with the highest BPM and at least 8 channels. Time window for processing on interrupt may be too short. I started such project but not finished it yet. But it is the easiest platform to ...
by ixtern
Sun Jan 31, 2021 5:04 am
Forum: Music Tech DIY
Topic: 6..36dB VCF Lowpass/Highpass
Replies: 6
Views: 309

Re: 6..36dB VCF Lowpass/Highpass

Which manufacturer do you use? I use the Gerber specs and the files for the cam processor provided by Elecrow. Maybe you should change your manufacturer. I use proven manufacturer from my country. And I think he has a good reason to keep such specs. I wouldn't trust a pcb with such low distances be...
by ixtern
Sun Jan 31, 2021 4:10 am
Forum: Music Tech DIY
Topic: 6..36dB VCF Lowpass/Highpass
Replies: 6
Views: 309

Re: 6..36dB VCF Lowpass/Highpass

Which manufacturer do you use? I use the Gerber specs and the files for the cam processor provided by Elecrow. Maybe you should change your manufacturer. I use proven manufacturer from my country. And I think he has a good reason to keep such specs. I wouldn't trust a pcb with such low distances be...
by ixtern
Sat Jan 30, 2021 5:43 pm
Forum: Music Tech DIY
Topic: 6..36dB VCF Lowpass/Highpass
Replies: 6
Views: 309

Re: 6..36dB VCF Lowpass/Highpass

Nice project. I even wanted to assembly it but my PCB manufacturer said that Gerber files are out of his specs - vias diameters are too small (0.4mm, should be 0.8mm) and tracks distances are too small (7 mils, sometimes 4 mils, should be at least 8 mils). I've even tried to import Gerber files into...
by ixtern
Thu Jan 21, 2021 6:10 am
Forum: Music Tech DIY
Topic: THAT4305 Compressor: Adjustments
Replies: 3
Views: 158

Re: THAT4305 Compressor: Adjustments

1. NE5532 has lower noise (about 3 times lower than TL072). It may be noticeable with low level signals. 5532 is a bipolar Op Amp but in this circuit it doesn't matter. 2. Gain range will start from 0dB if you connect one end of pot R12 to the ground. 3. If you want to increase gain, change R8 accor...
by ixtern
Wed Dec 16, 2020 12:26 pm
Forum: Music Tech DIY
Topic: EATYOURGUITAR WEBSITE DOWN FOR GOOD
Replies: 17
Views: 1084

Re: EATYOURGUITAR WEBSITE DOWN FOR GOOD

You have not walked far away. Today's synthesizers are specialized computers with specialized software (sometimes even have keyboards).
And music theory is based on mathematics.
by ixtern
Fri Nov 06, 2020 4:37 am
Forum: Music Tech DIY
Topic: ? Headphone selector switch bevore the preamp, any impedance problems to expect ?
Replies: 4
Views: 151

Re: ? Headphone selector switch bevore the preamp, any impedance problems to expect ?

Depending on your pre-amp circuit you may expect change in output volume when load impedance (headphones) is changing. Also low frequency range may be affected (lower headphones impedance - worse low frequencies) but it also depends on the circuit.
And expect clicks if switched when power is on.
by ixtern
Wed Nov 04, 2020 3:27 pm
Forum: Music Tech DIY
Topic: Software or function in the arduino itself for monitoring the code?
Replies: 14
Views: 375

Re: Software or function in the arduino itself for monitoring the code?

devinw1 wrote:
Wed Nov 04, 2020 2:59 pm
One of the weakest parts about the Arduino API is that it really doesn't have a proper debugger!
Arduino API is for those not knowing how to use debugger.
If you know how to use debugger, you don't need it (in Arduino) :)
by ixtern
Wed Nov 04, 2020 2:40 pm
Forum: Music Tech DIY
Topic: Audio signal processing and coding
Replies: 9
Views: 470

Re: Audio signal processing and coding

Hal Chamberlin - Musical Applications of Microprocessors. Chapter 13: Digital Tone Generation Techniques and next ones. Little old-fashioned but theory is theory, not aging so fast. And relatively simply. Vadim Zavalishin - The Art of VA Filter Design (little harder to read). Source code: look at th...
by ixtern
Wed Nov 04, 2020 2:29 pm
Forum: Music Tech DIY
Topic: Software or function in the arduino itself for monitoring the code?
Replies: 14
Views: 375

Re: Software or function in the arduino itself for monitoring the code?

1. You may use Serial Port Monitor. I recommend to set it to max possible speed (usually 115200 or so). Please notice that the same value must be set on both sides - in the code and in the serial monitor. Use it only for debug. If you want examples, look at my source arduino code of the Digital Poly...
by ixtern
Mon Nov 02, 2020 7:12 am
Forum: Music Tech DIY
Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
Replies: 8
Views: 413

Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step

thanks for putting the samples up, i see what you mean. your build is looking great, very clean organization of boards and ccables. Thanks. Such organization was possible due to "mainboard" conception, putting all connectors at the edges of the board, using pcb-type MIDI connectors and enough space...
by ixtern
Sun Nov 01, 2020 4:54 pm
Forum: Music Tech DIY
Topic: Are cem3340s exchangeable with the clones
Replies: 10
Views: 481

Re: Are cem3340s exchangeable with the clones

Jaytee wrote:
Sun Nov 01, 2020 4:14 pm
There’s one resistor change to make when using the Alfa clone but otherwise they’re pin compatible.
Alfa clones need two resistors to be changed: one for -V input and one for pulse output.
I've encountered VCO circuits which works better with CEM3340 than with AS3340.
by ixtern
Sun Nov 01, 2020 2:53 pm
Forum: Music Tech DIY
Topic: Multiple Power Supplies
Replies: 2
Views: 139

Re: Multiple Power Supplies

I have built two Frequency Central Power Supplies, each of which are powered by a wall-wart. They both provide the +/-15 volts as expected, and one has a 5v regulator installed as well. Should their grounds be the same? When I (very briefly) touched my voltmeter probes to their grounds, there was s...
by ixtern
Sun Nov 01, 2020 6:36 am
Forum: Music Tech DIY
Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
Replies: 8
Views: 413

Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step

this is awesome. ive always been curious about the dreamblaster, seems like theres a lot in there. how do the effects sound? Effects (chorus, reverb) are rather "delicate" which means that there is noticeable change but not so big I've expected. And it depends on kind of program. Must say that Atta...
by ixtern
Sat Oct 31, 2020 4:34 pm
Forum: Music Tech DIY
Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
Replies: 8
Views: 413

Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step

Part3: Prototype. Prototype design resembles PC. It has mainboard, modules, displays, controls and input/output jacks. Mainboard and modules were made on stripboards. Case is standard 1U 19" rack. Audio connections were done with shielded cable, mainboard under-connections - with teflon-coated AWG28...
by ixtern
Sat Oct 31, 2020 4:16 pm
Forum: Music Tech DIY
Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
Replies: 8
Views: 413

Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step

Part 2: Source Code. Disclamer: The code is "as is". It was not coded using professional standards but to have maximum simplicty and understanding. It may contain remains of previous, not used or future functionalities. Current version is still work-in-progress (and probably always will be). Synthes...
by ixtern
Sat Oct 31, 2020 2:33 pm
Forum: Music Tech DIY
Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
Replies: 8
Views: 413

Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step

Part1: Concept design and schematic. 1. General information DreamBlaster X2 is a GM/GS polyphonic MIDI synthesizer module designed in Waveblaster format. It is based on Dream 5505B chip with 81 voices polyphony and effect engine. As it has built-in USB interface and audio output, it may work as a so...
by ixtern
Wed Oct 28, 2020 1:05 pm
Forum: Music Tech DIY
Topic: Cheap Aliexpress/Ebay parts directory
Replies: 38
Views: 3879

Re: Cheap Aliexpress/Ebay parts directory

But yes for hobbyists, AliExpress is the better place, although as others have pointed out as well as me, it is a minefield to havigate to avoid the fakes by having to test everything when it arrives. But AliExpress do refund you within 3 days if you do find you've been sent some. Previous years I'...
by ixtern
Fri Oct 16, 2020 4:51 pm
Forum: Music Tech DIY
Topic: Advice on Encoders and OLED's
Replies: 6
Views: 259

Re: Advice on Encoders and OLED's

I'm using Bourns PEC16 encoders with pushbuttons (bought from Mouser). Maybe little too big but reliable.
IMG_20201016_233414.jpg
My OLED display is 1.3" white OLED 128x64 I2C module (bought on Aliexpress).
IMG_20201016_234105.jpg
by ixtern
Fri Oct 16, 2020 3:09 am
Forum: Music Tech DIY
Topic: Coolaudio 3046 transistor array clone
Replies: 23
Views: 931

Re: Coolaudio 3046 transistor array clone

^ Agree with the latter. But not the former. The cerdip may need an adjustment to its oven temp, but there's no reason to expect lower thermal resistance will upset the oven control in typical synth use cases. It's not a fighter jet avionics environment. <-- where it *would* matter. But where also ...
by ixtern
Thu Oct 15, 2020 5:30 pm
Forum: Music Tech DIY
Topic: Coolaudio 3046 transistor array clone
Replies: 23
Views: 931

Re: Coolaudio 3046 transistor array clone

1. The most important difference between 3045 and 3046 for analog VCO's is the thermal resistance (lesser for CERDIP package). Changing 3046 for 3045 may cause temperature stabilization problems for owen-based VCOs. 2. High voltage versions like 3146 are not full replacement for 3046. Analog VCOs us...

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